Advances in Earth Science ›› 2001, Vol. 16 ›› Issue (2): 153-162. doi: 10.11867/j.issn.1001-8166.2001.02.0153

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ZHU Bing-quan, CHANG Xiang-yang   

  1. Guangzhou Institute of Geochemistry,CAS,Guangzhou510640,China
  • Received:2000-09-13 Revised:2000-10-22 Online:2001-04-01 Published:2001-04-01

ZHU Bing-quan, CHANG Xiang-yang. GEOCHEMICAL PROVINCES AND THEIR BOUNDARIES[J]. Advances in Earth Science, 2001, 16(2): 153-162.

Based on great quantity of Pb Sr Nd isotopic data from various mantle and crust derived rocks and ores in Continental China, and global comparison of isotopic and element systematics, especially for the blocks in the eastern Asia, we developed the indexes and mapping methods of isotopic geochemistry for the division of geochemical provinces. The major geochemical provinces in Continental China and their geochemical steep zones, i.e. boundaries, have been established through large scale mapping of Pb isotopic vectors(the values in three dimensions space of 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb).The generation of geochemical boundaries was tightly related to inclined combination of plates, as well as craton boundaries resulted in adjustment of lithosphere structure after plate collision. There are parallel or cross relationships between geochemical boundaries and gravity, Moho and magnet gradisnts. The division of geochemical provinces and establishment of their boundaries not only provide important basis for the paleo continent reconstruction and ascertaining plate boundaries, but also can be widely applied to exploration and evaluation of resources, establishment of environment background and pollution sources, as well as calamity forecasting. It is indicated from our study that the giant Au, Cu,Mo,Sn,Ag,Ni,Pb Zn,U,K salt,B,Mg and P deposits of about 90%, and more than 10 large concentrated mineralization districts in Continental China was controlled by the geochemical steep zones. The geochemical provinces constrained on distribution of global oil gas resources, whereas geochemical boundaries particularly controlled the sites of oil gas fields at the craton margins. There are tight relationships between strong destroying earthquakes with shallow sources and craton geochemical boundaries. The occurrence of karst caves and collapses is also closely related to the geochemical boundaries. As background values of Pb isotopes within a geochemical province is quite stable, based on the background values established by geochemical mapping, fast quantitative evaluation for Pb pollution level can be made.

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