| 内蒙古乌拉山金矿带铅同位素地球化学研究 |
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| 引用本文： | 郎殿有.内蒙古乌拉山金矿带铅同位素地球化学研究[J].地质找矿论丛,1992,7(1):93-102. |
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| 作者姓名： | 郎殿有 |
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| 作者单位： | 内蒙古地矿局一○五地质队 |
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| 摘 要： |
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| 关 键 词： | 金矿带 铅 同位素 地球化学 金矿 |
Pb-ISOTOPE GEOCHEMISTRY OF WULASHAN GOLD ORE BELT |
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| Lang Dianyou.Pb-ISOTOPE GEOCHEMISTRY OF WULASHAN GOLD ORE BELT[J].Contributions to Geology and Mineral Resources Research,1992,7(1):93-102. |
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| Authors: | Lang Dianyou |
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| Institution: | 105 Team, Inner Mongolia Geology and Mineral Resources Burea |
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| Abstract: | This paper deals with composition characteristics, tracing role and evolution history of Pb-isotope of wulashan gold ore belt. Gold ore deposits are genetically related to both of the metamorphic rocks and granites. Pb of the rocks in the ore belt is derived from the lower crust. Pb in ores is old multistaged normal lead characterized by lower crust Pb and orogenic belt Pb. Pb in granites consists of Pb from the lower crust, the upper crust and the orogenic belt. 33-36my is put forward first for the rock-forming age of wulashen Group. Pb-Pb method age of 280my represents a main regional metamorphism; the temporal growth model age of 235m, the maximum age of mineralization and a later heat event. Tracing role of Pb-isotope throws a new light on the Au-metallogeny of the Wulashan ore belt. Basement of Archean rocks make a basis on which Late Varisean-Middle Mesozoic granitic magmatism remobilized, transported and enriched gold. The related fractures make rooms for gold emplacement. Gold deposits in the belt experienced, at least, two stages i. e. volcano-sedimentary stage (330my) and Late Varisean-Middle Mesozoic granitic magmatism hydrothermal fluid stage (20my). |
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