| 鲁西地区绿岩带金矿床铅同位素研究 |
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| 引用本文： | 张拴宏,周显强.鲁西地区绿岩带金矿床铅同位素研究[J].矿物岩石,1999,19(2):72-76. |
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| 作者姓名： | 张拴宏 周显强 |
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| 作者单位： | 中国地质科学院地质力学研究所 |
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| 摘 要： | 在鲁西太古宙绿岩带中，分布有较多的绿岩带变生热液－构造蚀变岩型金矿，具有良好的找矿前景。从铅同位素组成来看，区内铅同位素变化较大，多为放射性成因铅质量分数较高的异常铅。所测同位素样品中，以黄铁矿铅同位素组成变化最大，是铅同位素在演化过程中受到放射性铀铅和钍铅不同程度混染的结果，多数样品单阶段模式年龄不具计时意义。计算表明，区内铅来源于ｕ＝９．２０，ｗ＝３７．４５，ｋ＝３．９５的源区，在５９５Ｍａ前
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| 关 键 词： | 金矿床 铅同位素 成矿物质来源 绿岩带 鲁西 |
STUDY ON THE LEAD ISOTOPE OF GOLD DEPOSITS IN THE GREENSTONE BELTS IN WESTERN SHANDONG |
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| Zhang Shuanhong,Zhou Xianqiang,Tian Xiaojuan.STUDY ON THE LEAD ISOTOPE OF GOLD DEPOSITS IN THE GREENSTONE BELTS IN WESTERN SHANDONG[J].Journal of Mineralogy and Petrology,1999,19(2):72-76. |
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| Authors: | Zhang Shuanhong Zhou Xianqiang Tian Xiaojuan |
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| Abstract: | There are many gold deposits in Archean greenstone belts of western Shandong. According to previous studies, these gold deposits are metamorphic geothermal fluid tectonic alteration gold deposits.Analysis of ten samples from the area show great variation in the composition of lead isotope and most of them contain much radiogenic lead. Pyrite in the ore shows the greatest variation in composition of lead isotope, which was resulted from the mixture of radioactive U Pb and Th Pb during the development of lead isotope. Because of the existence of the radioactive lead in lead isotope, the single stage model ages of most lead isotope are of no significance. On the basis of calculation, we know that the lead isotope came from the source area where u=9 20,w=37.45,k=3.59. It was separated from the source area 595 Ma ago and mixed by the radioactive lead formed from 1 534 Ma to 2 463 Ma. From Zartman and Doe's model of plumbtectonics, it can be concluded that most lead isotope in the area was derived from the mantle and the rest was the mixture of the lead isotope from the mantle and upper crust. As a result we can infer that the material of mineralization came from the depth, and the gold deposits were formed by magmatism and tectonism induced activation, migration, mixture and accumulation of materials from the basement rocks. |
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| Keywords: | gold deposit lead isotope source of mineralization greenstone belts western Shandong |
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