| Geochemical Characteristics of Jinwozi Gold Deposit,Xinjiang |
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| 摘 要： |
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| 关 键 词： | 金矿床 新疆 地质构造 成矿流体 成矿作用 流体包裹体 |
Geochemical characteristics of Jinwozi gold deposit,Xinjiang |
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| Authors: | Zhengen Zhang Nansheng Chen |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, China |
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| Abstract: | The Jinwozi gold deposit consists of gold-bearing quartz veins in a biotite granodiorite of Hercynian age (zircon U-Pb age
≈ 335.7 Ma). Ore mineralogy is simple. In addition to native gold, there are only small amounts of sulfides, mainly pyrite
and minor sphalerite, chalcopyrite and galena. δ34S values average 6.69‰, and δ18O 13.99‰ Abundant CO2 is contained in fluid inclusions from quartz. Homogenization temperatures of fluid inclusions are between 186 and 262 °C.
REE distribution patterns indicate that the igneous mass may have been derived from a common initial material of calcareous-argillaceous
sediments and alkali basalts as the country rocks. In other words, the Jinwozi granodiorite is of remelting origin from crustal
material. Isotopic evidence of S, O and Pb shows that the ore-forming material is genetically related to magmatic hydrothermal
activity. |
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