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《Geochimica》 2002-06
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Development and significance of geochemical blocks

LIU Da-wen (Institute of Geophysical and Geochemical Exploration,The Ministry of Land and Resources,Langfang065000,China)   
Geochemical blocks are the giant roc k blocks with high content of one or mo re elements within the upper earths crust,they are the net resul ts of the earths original heterogen eity and the distribution and redistribution of metals during the evolution of the earth up to the present days and provide large metal endowments necessary fo r the formation of large to giant ore deposits.These blocks can be delineated b y the methods of exploration geochem istry.By study the flood of high quality data obtained in Chinas national geoch emical mapping program(RGNR)carried out for 24years over more than 6million km 2 of Chinas territory,it is found more broad geochemical patterns other than dispersion halos and dispersio n trains,e.g.geochemical regions,geochemical provinces,geochemical megaprovinces and geochemical doma ins.They are the surface expression s of large blocks of rock with higher m etal contents.Geochemical blocksmeth ods for finding new large to giant ore deposits of different types of locations within or in the surroundings of larg e geochemical blocks have been developed by which important new discoveries have been already obtained in some re gions in China.Though the developme nt of the geochemical block concept and methodology is still in early stage,but it has already extended the basic principle of exploration geochemis try,and widened the field of vision for ore genesis metallogeny and tectonics,an d provided them with new thought-pro voking approaches.
【Fund】: 国家重点基础研究项目(G1999043217);; 国家攀登B-85-34
【CateGory Index】: P59
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