(Nanjing Institute of Geology and Mineral Resources, Nanjing 2 100 16)
1 overview
1999 July 16, China Geological Survey was formally established. Its main tasks are: to undertake, organize and implement national basic and public welfare geological surveys and strategic mineral exploration, provide basic geological data for national economic and social development, and provide public welfare services to the society.
1999 since the implementation of geological survey, under the unified leadership of China Geological Survey, one plan and four projects (basic survey plan, mineral resources survey and evaluation project, geological disaster early warning project, digital land project and resource survey and utilization technology development project) have been scientifically deployed and carefully organized, and new mechanisms, new concepts, new theories, new technologies and new methods have been adopted, which has achieved remarkable fruitful results and remarkable social economy.
Up to 2005, in the seven years since the implementation of geological survey, a total of 56 geological survey projects/kloc-0 have been arranged in East China, and * * * has received funds of 4 129 10000 yuan. Among them, there are 32 basic geological surveys, 73 mineral resources surveys and evaluations, 23 geological environment surveys and evaluations, and 28 geophysical, geochemical and remote sensing surveys. * * * borne by 17 work unit.
2 Main progress and achievements
2. 1 basic geological survey
With an investment of 43.67 million yuan, 22 regional geological surveys 1.25 million, 22 regional geological surveys 1.50 million and 4 ecological and environmental geological surveys 1.50 million have been completed. There are 9 regional geological surveys of1:250,000 in progress.
The main results are as follows:
2. 1. 1 Precambrian stratigraphic division and correlation
Precambrian strata in eastern China are mainly developed in Dabie-Sulu, Yangtze and Cathaysia.
Huaxia Stratigraphic Area: Through the regional geological survey of Shaowu, Longyan, Sanming and Ruijin with a scale of1:250,000, the nearly north-south geological corridor in western Fujian was opened, and the geological research level in this area was improved. It is affirmed that Wuyi area is generally uplifted by Caledonian metamorphic fold, and there are Sinian-Nanhua shallow metamorphic silicalite (quartzite) and stratigraphic sequence similar to Yangtze area under Cambrian. The lithologic combination of Paleoproterozoic Mayuan Group and Neoproterozoic Mamianshan Group is further studied, and it is proposed that there are bimodal volcanic rocks in Neoproterozoic. The geometric characteristics and kinematic mechanism of metamorphic core complex with the Paleoproterozoic Taoxi Formation as the core are dissected, and its formation age is mainly determined as Indosinian period.
Yangtze Stratigraphic Area: Through the regional geological survey and comprehensive study of Nanchang, Shangrao, Jingdezhen and Jinhua at the scale of 1.25 million, the lithostratigraphic units in this area have been completely cleared up, and the lithostratigraphic and tectonic-stratigraphic systems have been established, thus solving the phenomenon that the same thing has different names and foreign objects have the same name among provinces. Mesoproterozoic island arc volcanic rocks represented by Shuangxiwu Group have been further confirmed, and the research on Neoproterozoic bimodal volcanic rocks, intrusive rocks and basic dyke groups has been further strengthened.
Dabie Sulu Stratigraphic Area: The metamorphic supracrustal rock assemblage in Dabie Mountain area is divided into Proterozoic Dabie Mountain Group and Mesoproterozoic Susong Rock Group, and the former Lu Shen metamorphic supracrustal rock assemblage belongs to Mesoproterozoic Dongling Rock Group. It is pointed out that most metamorphic intrusive rocks were formed in Neoproterozoic, a few in Mesoproterozoic, Dabie Mountain Group in Mesoproterozoic and Susong Group in Mesoproterozoic.
2. 1.2 golden nail outline
Two existing gold nail profiles in China are located in East China: in the regional survey of Huangniqu profile1:50,000 in Changshan County, a tuff with a thickness of cm was newly discovered, and a single zircon was isolated from it, with accurate dating and accurate dating of the boundary. In this paper, the distribution area of the international Permian-Triassic boundary stratotype profile is mapped with high precision and large scale, and the key layers in the boundary layer (such as PTB boundary clay layer and international conodont zone in PTB boundary layer) are investigated in detail, and two important conodont zones are identified: Clarkina subcarinata zone; Changxing Clark belt greatly improves the accuracy of biostratigraphic correlation in this area.
2. 1.3 mapping method of quaternary thick coverage area
In the regional geological survey of 6.5438+0: 250,000 in Hangzhou, Nanjing, Nantong and Shanghai, we paid attention to the Quaternary geological research in the thick coverage area, introduced the theory and method of high-resolution sequence stratigraphy into the Quaternary geological research, adopted the concept of "base level cycle", and established the isochronous stratigraphic framework and correlation basis in this area by combining various stratigraphic division methods such as lithostratigraphy, climate stratigraphy, chronostratigraphy and magnetostratigraphy. Starting with the study of standard holes, through the identification and study of ancient soil, ancient exposed surface, erosion surface and sedimentary interface compared with them, the isochronous comparison problem between standard holes and general drilling climate cycle is solved, and the newly discovered study of Zhejiang lake-crossing bridge culture and ancient environment is explored. More informal lithostratigraphic units have been added to the Quaternary geological map in thick coverage area, which enriches the map content.
2. 1.4 Mesozoic volcanic rocks along the southeast coast.
In recent years, through regional geological survey and comprehensive research, coastal provinces have basically found out the period and law of volcanic activity in this area, and classified and compared the volcanic strata through accurate isotopic dating, confirming that the age of volcanic rocks in Moshishan Group is Early Cretaceous (137.7 ~113 Ma), rather than the long-standing late Jurassic. It laid a foundation for further study on the tectonic evolution of volcanic rocks in the southeast coast.
2. 1.5 Summary of regional adjustment methods of continental red basins
In the regional adjustment of1:50,000 gold fields and Tian Li, based on the Mesozoic continental red basin, with the guidance of sequence stratigraphy theory, starting from the division of structural interfaces, combined with the investigation of lithology and lithofacies, the properties of various structural interfaces and the material composition, structural characteristics, formation environment, temporal and spatial distribution and overlapping relationship of sedimentary bodies were investigated and studied, and the continental lithostratigraphic sequence was established and lithostratigraphic units were divided.
2. 1.6 computer drawing method pilot
Fujian Geological Survey Institute, as the first batch of computer mapping pilots of China Geological Survey, took the lead in completing the regional geological survey of1:50,000 Dongshan County and Gongqian area with computer-aided mapping method. Improve the data model of field data space and attributes of regional geological survey and its related standards and technical specifications, and realize the formation, organization, concentration, preservation, retrieval and analysis of multi-source regional geological survey information. G 1S regional geological survey multi-source information management and analysis spatial integrated information system is established on different G 1S platforms.
2.2 Regional physics, chemistry and remote work
In the past seven years, China Geological Survey has deployed 28 regional geophysical and geochemical remote sensing survey projects in East China, and * * * obtained175.47 million yuan, including 81970,000 yuan invested by China Geological Survey and 93.5 million yuan supported by local funds.
2.2. 1 regional geophysical exploration work
The gravity survey in western Fujian was completed, with 3,870 gravity measuring points and an investigation area of 22916.5km2. So far, the gravity survey in eastern China has been fully completed.
The application demonstration of geophysical prospecting methods based on regional geological survey and environmental geological survey in the Yangtze River Delta region was carried out. The investigation area of the Yangtze River Delta (south of the Yangtze River) was 30340km2, supplemented by gravity, magnetic and electrical sounding data, and comprehensive interpretation and mapping were carried out.
2.2.2 Agricultural Geology (Ecological Geochemistry) Survey
This work can be divided into two stages. In the early stage, the multi-target regional geochemical survey method experiment and investigation experiment were carried out in Nanchang, Jiangxi, Nanjing, Jiangsu and Xiamen-Zhangzhou, Fujian respectively, and the analysis method of organic pollution components and effective forms in multi-target geochemical survey was studied. Since 2002, China Geological Survey has signed agreements with the people's governments of Zhejiang, Jiangsu, Fujian, Anhui, Jiangxi and Shanghai to jointly carry out agricultural geological (eco-geochemical) surveys at the provincial (city) and ministerial levels. A total of 237,000 km2 multi-target regional geochemical exploration area has been completed, and a large number of test data have been obtained. According to the quality of soil environment, 226440km2 of soil was analyzed, and 2 1.483 km2 of Class III and Super III soils were circled, and it was found that there was regional Cd eco-geochemical environmental pollution along the Yangtze River. A number of eco-geochemical environment areas and high-quality areas have been found, among which the area suitable for developing green agricultural base is 140586km2, and the selenium-rich soil resources are 18294km2. The survey results are highly valued by local governments at all levels, showing good social and economic benefits. At the same time, the multi-objective regional geochemical survey norms have been compiled, and the comprehensive study of ecological geochemistry in the Yangtze River basin has been carried out. The early warning of ecological geochemistry in Guangzhou, Wuhan and Chengdu has been highly valued by the party and state leaders.
2.2.3 Remote sensing geological survey
Comprehensive remote sensing surveys were carried out in Anhui, Zhejiang, Fujian, Taiwan Province and Shanghai, covering an area of 620,000 square kilometers. At the same time, remote sensing investigation, monitoring and interpretation of basic geological environment are carried out in important economic zones in the east and the Yangtze River basin.
2.3 Investigation and Evaluation of Mineral Resources
In the past seven years, 73 mineral resources investigation and evaluation projects have been deployed in East China, with a total investment of120.78 million yuan (table 654.38+0). The main physical workload completed is: drilling 53760m, pit exploration 4674m, 1: 50000 geochemical exploration 13270km2. A total of 283 geochemical anomalies have been discovered, including small deposits 19, small deposits 15, medium deposits 22, large deposits 17 and super-large deposits 7.
Table 1 Classification of Mineral Projects in East China
The investigation and evaluation results of mineral resources show that ferrous metals (rutile), precious metals (silver, gold), rare metals (tantalum, niobium, lithium), nonferrous metals (tungsten, tin, lead, zinc) and important nonmetals (bentonite, kaolin, fluorite, quartz sand for glass) in eastern China have good prospects, and the dominant mineral positions such as tungsten and tin have been obviously enhanced.
Table 2 Main mineral resources in eastern China
Ferrous metal-rutile mineral: concentrated in the ultra-high pressure metamorphic belt in northern Jiangsu, belonging to eclogite rutile deposit.
Rare metal minerals: mainly related to the late Yanshanian alkaline granite formation developed in Jiangxi and the lower reaches of the Yangtze River, with great resource potential. The report of mineral exploration results submitted is mainly the Evaluation Report of Shananbang Tantalum Mine in Suzhou, Jiangsu Province, undertaken by Jiangsu Geological Survey Institute, which has submitted a super-large tantalum mine 1 mine, and the associated lithium, rubidium, cesium and hafnium resources have reached a medium-large scale.
Non-ferrous metals: China is dominated by tungsten and tin minerals, and East China is mainly produced in Gannan. The evaluation report of Jiangxi Huichang tin-copper polymetallic ore field and its surrounding areas has been submitted, and the large tin mine 1 has been submitted. The project "Evaluation of Zhuguangshan-Wanyangshan Tungsten Polymetallic Deposit in Jiangxi Province" is being implemented, and three potential mining areas with great prospects have been newly discovered. The project "Evaluation of Tungsten Mine in Du Yu-Quannan Area, Jiangxi Province" identified five mining areas (points) with large and medium-sized prospecting potential and five prospecting targets with further work significance. In addition, tungsten and tin minerals also show great resource potential in Jiuling-Zhanggongshan-southern Anhui uplift belt on the southern margin of Yangtze platform.
The breakthrough of lead-zinc ore prospecting mainly lies in the understanding of the occurrence horizon of Proterozoic massive sulfide deposits that was neglected in the past. Based on the comprehensive geochemical anomalies delineated by1:50,000 stream sediment survey and large-scale geochemical exploration, the effective prospecting methods for massive sulfide deposits in this horizon are put forward, and the prospecting breakthroughs of two large lead-zinc-silver polymetallic deposits in Youxi, Yan Feng, Fujian and Bawaiyang, Jian 'ou, Fujian are realized. At present, the search for this type of mineral is in the ascendant, and there is still great prospecting potential in northern Wuyi, central Fujian and southwestern Zhejiang.
The exploration breakthrough areas of precious metal minerals (silver and gold) are mainly distributed in Jiuling area of northern Jiangxi, northeastern Jiangxi and southern Anhui. The former two are ductile shear zone type gold deposits, while the latter is mainly time-dependent type gold deposits.
Comprehensive study on mineral resources: the comprehensive study on the metallogenic regularity and prospecting direction of two important metallogenic areas (belts) in Wuyishan and its adjacent areas, Anhui, Zhejiang and Jiangxi was completed, the basic spatial database of mineral resources investigation and evaluation in metallogenic areas (belts) was established, and a number of comprehensive basic maps were compiled.
The new round of investigation and evaluation of strategic mineral resources in East China has achieved the purpose of serving the national macro-development strategy, providing basic mineral information for national economic and social development, and providing decision support services for the planning, protection and utilization of land resources. At the same time, it laid a foundation for the subsequent exploration and evaluation of mineral resources and the allocation of resources compensation fees, promoted the investment in commercial geological exploration, promoted the development of the local mining market, and made contributions to the local social and economic development.
2.4 Geological environment investigation and evaluation work
East China is one of the most developed areas in China in economy, science and technology and culture. With the rapid development of regional social economy, great changes have taken place in the natural environment in this area, and the environmental quality has dropped sharply, which has aroused great concern of the whole society. Therefore, at the beginning of the establishment of China Geological Survey, regional environmental geological investigation and evaluation projects were deployed in the Yangtze River Delta, southeast coast, Huaihe River basin and other areas with outstanding environmental geological and water resources problems. Its purpose is to find out the environmental geological conditions and main environmental geological problems in the work area, establish the environmental geological database or information system in the work area by using GIS technology, realize the digitalization of investigation and exploration results and the computerization of evaluation and prediction, and provide strong geoscience technical support for social and economic construction. At the same time, in close connection with the goals and tasks of social and economic sustainable development, the countermeasures and suggestions for rational development and utilization of resources, geological environment protection and disaster reduction and prevention are put forward.
In the past seven years, China Geological Survey has deployed 23 hydrogeological investigation projects in East China and Southeast coastal areas (including Guangxi, Hainan and Guangdong), including basic investigation, disaster early warning and comprehensive research. * * * Received funds of 77.56 million yuan.
2.4. 1 Main progress and achievements
Investigation and evaluation of groundwater resources and geological disasters in the Yangtze River Delta: Taking the Yangtze River Delta (south of the Yangtze River) as a unified geological unit, the regional bedrock structure model and Quaternary sedimentary structure model are established to find out the evolution process of paleogeographic environment and the migration and evolution characteristics of ancient Yangtze River channels since Quaternary, which provides reliable basic geological basis for the establishment of groundwater aquifer system and land subsidence research.
Using GMS(3. 1) groundwater resources evaluation software, a three-dimensional groundwater flow model of pore confined water in this area is established, and the whole groundwater resources evaluation process is visualized.
The present situation of regional geological disasters such as land subsidence and ground fissures is found out, and their formation mechanism and basic characteristics are studied. The correlation model between land subsidence and groundwater level is established, the economic losses caused by it are evaluated, and the corresponding prevention measures are put forward.
The construction plan of the land subsidence monitoring network in the whole region has been initially established and implemented, which provides strong technical support for meeting the needs of the government and society and preventing and reducing disasters.
On the GIS platform, based on the bedrock structure model, Quaternary sedimentary structure model and groundwater aquifer system structure model, a relatively perfect "Integrated Geographic Information System of Groundwater Resources and Environmental Geology in the South of the Yangtze River Delta" was established, which realized the query, analysis, editing and management of relevant information.
2.4.2 Environmental Geological Survey of Huaihe River Basin
The pollution composition and distribution of groundwater at different depths in Huaihe River Basin were preliminarily identified, and the groundwater quality was evaluated. The results show that the water quality of shallow groundwater in Huaihe River Basin is generally poor, mainly classified as Class V and Class IV water, especially shallow groundwater with buried depth less than 20m. The distribution area of Class V and Class IV water is 54260km2, accounting for 9 1.6% of the water quality survey area. In contrast, the deep groundwater (buried more than 50m) has good water quality, and the distribution area of Class I, II and III water reaches 18955km2, accounting for 32% of the water quality survey area.
Evaluate the pollution degree of groundwater at different depths and divide the pollution degree of groundwater. The distribution area of heavily polluted shallow groundwater is 162 15km2, accounting for 27.3% of the water quality survey area. The distribution area of moderately polluted area is 3222 1km2, accounting for 54.49% of the water quality survey area. The distribution area of light pollution area is 10829km2, accounting for 18.3% of the water quality survey area.
The pollution characteristics of shallow groundwater and its influence on human health are discussed. Shallow groundwater pollution has the characteristics of zonal pollution, and the shallow groundwater pollution near the banks of sewage river (ditch) is the most serious, with more people suffering from hemiplegia and cancer.
The present situation, causes and harm of land subsidence in Fuyang city were preliminarily found out.
2.4.3 Environmental Geological Survey of Southeast Coast and Important Economic Zone
Based on the comprehensive analysis and investigation of the present situation, characteristics and causes of coastal changes, seawater intrusion and water and soil pollution in the southeast coastal areas, this paper summarizes the types, distribution, causes and harm of slow-changing and sudden geological disasters in the southeast coastal areas.
The characteristics of coastal environment, modern coastal changes and ancient coastal changes in southeast coastal areas were initially identified.
According to the evaluation results of groundwater resources, the development potential of groundwater resources is analyzed, and some ideas and suggestions for rational development and utilization of groundwater resources and development of brackish water and brackish water are put forward.
The present situation and causes of groundwater pollution in the northeast and southwest of Hainan Island, Pearl River Delta Economic Zone, Fujian coastal area, Guangxi Beibu Gulf and Suzhou-Wuxi-Changzhou area were preliminarily identified. The results show that the surface water pollution in the southeast coastal areas is becoming more and more serious, which leads to the expansion of the area and degree of shallow groundwater pollution, and the detection rate of organic pollutants in cities such as Changzhou suburbs is high.
By using groundwater isotope geochemistry method, the recharge, runoff and discharge conditions of groundwater and the changes of groundwater flow field in Suzhou, Wuxi and Changzhou are studied, and the types of groundwater pollution sources are discussed, which lays a good foundation for further investigation of groundwater pollution in this area.
On the basis of investigating the types, ways and distribution of seawater intrusion in the southeast coastal areas, it is pointed out that seawater intrusion in the western part of Hainan Island and Beihai area of Guangxi is mainly caused by unreasonable exploitation of groundwater, and seawater intrusion caused by shrimp culture in high places has also appeared.
In view of the main environmental geological problems, some suggestions and countermeasures are put forward, which provide geological basis for local governments to formulate relevant plans.
Some geological environment maps have been updated and newly compiled.
2.4.4 Hangjiahu Plain1:50,000 ecological environment geological survey pilot.
Strata, Quaternary paleogeographic environment, land use, soil environmental quality and pollution, groundwater resources and development and utilization, water environmental quality and pollution, geotechnical engineering geological characteristics, eco-geological tourism resources, etc. Has been fully identified.
Magnetic susceptibility testing technology has been successfully used to carry out regional soil environmental assessment in a large area. The magnetic susceptibility value can reflect the degree and scope of soil pollution to a certain extent, as well as the differences of chemical elements in the same soil under different soil types and different utilization methods. A new comprehensive evaluation method of eco-geological environment is put forward by adopting the principles of "unified method, regional evaluation" and "factor assignment and quantitative evaluation"
A set of eco-environmental geological map system consisting of more than 70 maps has been compiled. It has played a demonstration and guidance role in ecological environment geological survey.
The geographic information system of "Hangjiahu Plain1:50,000 pilot eco-environmental geological survey" was designed and developed by using MapInfo operating platform.
2.4.5 Investigation and monitoring of land subsidence in the Yangtze River Delta region
Based on the investigation of land subsidence, combined with the strategic layout of regional socio-economic development in the Yangtze River Delta, and according to the overall planning of land subsidence monitoring in the Yangtze River Delta, the technical standards and monitoring requirements for the construction of land subsidence monitoring network in the Yangtze River Delta were formulated, and a unified regional land subsidence monitoring network was established, which provided a basic guarantee for effective monitoring, comprehensive research and scientific prevention and control countermeasures of land subsidence in the Yangtze River Delta. At present, according to the requirements of unified planning and design, unified technical standards and unified data platform, the construction of land subsidence monitoring network in the Yangtze River Delta region is under way.
2.4.6 Comprehensive study on environmental geology of major coastal cities
Based on the idea of piecemeal research and overall synthesis, the regional geological structure, modern crustal activity, regional climate and hydrological characteristics, regional topography, regional lithologic structure characteristics, water resources conditions and other geological resources of the three major urban agglomerations around Bohai Sea, Yangtze River Delta and Pearl River Delta are emphatically analyzed and studied. This paper systematically sorts out and summarizes six major environmental geological problems that have great influence and overall effect on the sustainable development of cities in the eastern region: the shortage and unreasonable development and utilization of water resources, the intensification of ground deformation, the increasingly serious pollution of water and soil environment, the threat of sea level rise in coastal cities, the earthquake threat, the impact of the South-to-North Water Diversion Project and the Three Gorges Project on the Yangtze River Delta and related cities.
On the basis of in-depth analysis and evaluation of urban environmental geological problems, geological background factors of human engineering economic activities, and the harm and influence of major environmental geological problems and their development trends on urban construction and development, this paper explores the ways of benign and coordinated development of urbanization and geological environment in the eastern region from a macro and strategic perspective, and puts forward "the balance between supply and demand of urban water resources based on local water resources and water-saving development, the coordination between land subsidence and groundwater resources development and utilization, The prevention and coordination of some unstable geological environment factors in urban planning and construction, the coordination between solid waste landfill and geological environment suitability, the development and utilization of urban geological resources should be conducive to the sustainable development of cities, and the planning and construction of coastal cities should meet the needs of preventing the harm of sea level rise. In order to ensure the rational use of geological environment in urban planning and construction, the report puts forward measures such as strengthening the construction of relevant laws and regulations, improving the urban management system, strengthening the research and evaluation of urban environmental geology, and further broadening the investment channels of urban environmental geology.
3 outlook
The 11th Five-Year Plan is the last five years of land and resources survey, and 2006 is the first year of its implementation. According to the overall work arrangement, new situation, new tasks and new requirements of the Ministry of Land and Resources, China Geological Survey put forward the key areas, directions and tasks of geological survey. The main tasks are: to update a number of basic geological maps and establish a geological survey information service system through the "Eleventh Five-Year Plan" geological survey; Complete the potential evaluation of important mineral resources in the main metallogenic belt and discover a number of new reserve bases for mineral resources exploration; Complete the investigation and evaluation of groundwater resources in major river basins in China, and initially grasp the groundwater pollution situation in the eastern region; Scientifically evaluate the geological environment and establish a set of monitoring and prevention system for geological environment and geological disasters; Develop major geoscience theories, and make the related science and technology of geological survey in China reach the international advanced level.
3. 1 basic geological survey
Continue to carry out1:250,000 regional surveys (7 pieces), carry out1:250,000 regional and environmental geological surveys in coastal areas and environmentally fragile areas (5 pieces), and carry out1:50,000 regional and geological surveys in Wuyishan, Zhejiang, Anhui and Jiangxi neighboring areas and important cities and densely populated areas in the east.
Complete the multi-objective regional geochemical survey in the ratio of1:250,000 in the Yangtze River economic belt and coastal economic belt, and carry out the construction of regional geochemical database and regional comprehensive research.
Continue to push forward and fully complete the pilot work of three-dimensional geological survey in Shanghai, Hangzhou and Nanjing, and establish and popularize the working method system of urban geological survey.
Taking a large area as a unit, we will carry out a pilot project to compile a new generation of national regional geological records and series of comprehensive maps.
Trial production of newly introduced new airborne geophysical parameters (or comprehensive parameters) such as airborne gravity and airborne transient electromagnetism will be carried out in important metallogenic belts. Establish a regional geophysical database, compile a series of maps of1:250,000 (or1:200,000) regional gravity survey and aviation geophysical survey, and make mapping and comprehensive research on important metallogenic belts.
Continue to carry out remote sensing survey and dynamic monitoring of geological environment in the eastern coastal areas and the Yangtze River basin; In the important metallogenic belt, the aerial remote sensing survey of1:50,000 was carried out by using high-precision aerial camera, digital camera and POS system.
Complete the multi-objective regional geochemical survey of the covered areas and important agricultural economic zones. Carry out regional eco-geochemical evaluation of important economic zones. Promote different levels of land eco-geochemical assessment and play a demonstration role in the whole country. Comprehensively carry out the application research and application promotion of ecological geochemical survey data. Carry out geochemical investigation and testing of organic pollutants and start geochemical investigation of organic pollutants.
We will carry out research on deep penetration geochemistry and mineral exploration technology in concealed areas and carry out pilot work on geochemical deep prospecting in important metallogenic belts.
3.2 Investigation and Evaluation of Mineral Resources
Adhere to the rich copper, iron, lead and zinc, high-quality manganese, bauxite, chromium, potassium salt, tin, tungsten and nickel as the main minerals, carry out the potential investigation of important mineral resources in the middle and lower reaches of the Yangtze River, the eastern part of Nanling and Wuyishan metallogenic areas, gradually narrow the target area, evaluate the prospective areas of key mineral resources, and strive to make a major breakthrough in prospecting.
Middle and lower reaches of the Yangtze River: Focus on the research, test and pilot work of prospecting methods for shallow-deep concealed ore, laying a good foundation and pilot work for the exploration of shallow-deep concealed ore (500 ~ 1000 m) in important metallogenic areas (belts) in the east.
Eastern Nanling area: The main minerals are tin and tungsten polymetallic. The Zhuguangshan-Wanyangshan rock mass was investigated and evaluated in the tin mine. Tungsten mines are mainly investigated and evaluated in Chongyuyou, "Sannan" and Ganxian-Du Yu area in Jiangxi. The main work includes strategic mineral prospect investigation, anomaly verification and occurrence inspection, and important occurrence evaluation, in order to make new breakthroughs in tin-tungsten ore prospecting. The potential of regional tin-tungsten polymetallic resources is evaluated as a whole. It is expected to submit a number of large and medium-sized mineral resources exploration bases.
Wuyishan area: mainly copper, lead and zinc. Focus on the resource investigation and evaluation of lead-zinc scenic spots in central Fujian-southwest Zhejiang, Shanghang-Xiao Yun in Fujian and Xunwu-Qianshan copper scenic spots in Jiangxi. Through strategic mineral prospect investigation, a number of prospecting targets are optimized, pre-survey and general survey are carried out, and a number of large and medium-sized exploration bases are submitted to strive for a breakthrough in copper prospecting.
At the same time, we will cooperate with countries (regions) around the southeast continent of China to carry out comparison of metallogenic geological conditions and evaluation of resource potential, and study and put forward a number of overseas prospecting areas (belts) to provide basic data and decision-making basis for overseas mineral resource potential investigation.
3.3 Geological Environment Investigation and Evaluation
In the Yangtze River Delta and Huaihe River Basin Plain, taking the regional groundwater system as a unit and shallow groundwater and its environmental system as the object, the inorganic pollution and organic pollution investigation were systematically carried out to find out the groundwater pollution situation, comprehensively evaluate the groundwater pollution degree and changing trend, and establish an early warning system for groundwater quality and pollution.
Completed1:250,000 groundwater pollution survey of 66000km2,1:50,000 groundwater pollution survey 15000km2. Based on the established monitoring network of land subsidence in the Yangtze River Delta, land subsidence detection and network management in the Yangtze River Delta will continue.
On the basis of the Eleventh Five-Year Plan, we will continue to investigate and evaluate the environmental geological problems and their causes in major cities, find out the main environmental geological problems that restrict urban construction and development, and put forward countermeasures and suggestions for the prevention and control of environmental geological problems and geological disasters.
Summary of "105" geological survey in eastern China and prospect of "1 1"
Guo kunyi
(Nanjing Institute of Geology and Mineral Resources, Nanjing 2 100 16)
Abstract: China Geological Survey was formally established on July 6, 1999/KLOC-0. Its main tasks are: to undertake, organize and implement national basic and public welfare geological surveys and strategic exploration of mineral resources. It also provides geological basic data for national economic and social development and public welfare undertakings. Over the past six years, under the leadership of China Geological Survey, through scientific arrangement and careful organization, and by using new theories, technologies and methods, remarkable achievements and social and economic benefits have been achieved in basic geological survey, environmental geological evaluation and mineral resources survey.