| 青海东昆仑造山型金矿硫、铅同位素地球化学 |
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| 关键词:East Kunlun Qinghai Province orogenic gold deposit sulfur and lead isotopes mineralization mechanism |
| 基金项目:国土资源部地质调查项目(K1.1.3.1,DKD20010274) |
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| 摘要: |
| Sulfur and Lead Isotope Geochemistry of the Orogenic Gold Deposits in East Kunlun Area, Qinghai Province |
| Based on the basic geological characteristics and sulfur and lead isotopic geochemistry of four typical gold deposits, it is considered that these deposits have many similar geological-geochemical characteristics and are all related to the orogenic process in genesis. Therefore, they should belong to the type of orogenic gold deposits according to the newest classification of gold deposits by Kerrich et al.(2000). There exists remarkable variation (from -3.7‰ to 4.4‰) in the average δ 34S values of the sulfides selected from different deposits, and the tower-shaped distribution is apparent. The lead isotopes in four gold deposits are characterized by high ratios and minor changes,with 206Pb/ 204Pb, 207Pb/ 204Pb and 208Pb/ 204Pb respectively higher than 18.3380,15.5555 and 38.1796 in ores and wall rocks. It can thus be concluded that the ore-forming materials consisting of sulfur and lead are mainly derived from wall rocks. Besides forming deep faults,large-scale shear belts and low-order folds and faults, the intensive subduction and collision during late Paleozoic and early Mesozoic induced fluidization and mineralization and resulted in the formation and zonal distribution of several large-or medium-size gold deposits in this area. |
| FENG Cheng-you,ZHANG De-quan,LI Da-xin,SHE Hong-quan.2003.Sulfur and Lead Isotope Geochemistry of the Orogenic Gold Deposits in East Kunlun Area, Qinghai Province[J].Acta Geoscientica Sinica,24(6):593-598. |
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