| 张衡,胡永丽,侯四周,李亚涛,李爽,李茜.河南汝阳老代仗沟铅锌矿床成因研究[J].矿产勘查,2021,12(8):1734-1742 |
| 河南汝阳老代仗沟铅锌矿床成因研究 |
| Genesis of the Laodaizhanggou Pb-Zn deposit, Ruyang County, Henan Province |
| 投稿时间：2020-11-30 |
| DOI： |
| 中文关键词: 河南 老代仗沟铅锌矿床 矿床成因 同位素 地质年代学中图分类号: P611 文献标志码: A 文章编号: 1674-7801(2021)08-1734-09 |
| 英文关键词: Henan Laodaizhanggou Pb-Zn deposit genesis isotope geochronology |
| 基金项目:本文受河南省地质矿产勘查开发局局管地质科研项目([2017]13号)资助。 |
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| 中文摘要: |
| 本文结合前人的研究成果，利用地质年代学、同位素及流体包裹体特征分析方法，总结了老代仗沟铅锌矿床的硫、铅、氢、氧、碳同位素地球化学特征。老代仗沟铅锌矿床的铅同位素显示铅来自地幔； δ34S变化范围 6.2‰～ 12.2‰，平均 8.61‰，具有多源性；石英中的 δD值为-91.9‰～-81‰， δ18OH2O值为-7.5‰～ 9.3‰，说明岩浆水和大气降水同时参与了该矿床的成矿过程；方解石碳同位素 δ13CPDB值为-4.5‰， δ18OSMOW值为 8.4‰，显示了地幔来源的特征。结合铷锶同位素等时线年龄(126±13) Ma及该矿床的流体包裹体显示的中 -高温、低盐度的含 CO2的 K+-Na+-Ca2+-Cl--SO42-体系特征，笔者认为老代仗沟铅锌矿床为燕山晚期成矿的中-高温岩浆热液充填交代型铅锌矿床。该研究对汝阳南部地区同类型铅锌矿床的寻找具参考价值。 |
| 英文摘要: |
| Based on the previous research results, this paper summarizes the geochemical characteristics of the sulfur isotope, lead isotope, hydrogen and oxygen isotope and carbon isotope in the Laodaizhanggou Pb-Zn deposit through geochronology, isotope and .uid inclusion characteristics analysis method. The lead isotope of Laodaizhanggou Pb-Zn deposit shows that the lead cames from the mantle. The δ34S varied from 6.2‰～ 12.2‰ with the average of 8.61‰, which had the characteristics of multiple sources. The δD of quartz range from -91.9‰～ -81‰ and the δ18OH2O of quartz range from -7.5‰～ 9.3‰, which shows that the magmatic water and meteoric water participate in the di.erent metallogenic stage of the deposit. The δ13CPDB and δ18OSMOW values in the calcite is -4.5 ‰ and 8.4 ‰ respectively, which show the characteristics of mantle source. Combining with the Rb-Sr isochron age of (126±13)Ma and the features of the ore-.uid with moderate-high temperature, low salinity, CO2-riched in the K+-Na+-Ca2+-Cl--SO42-system, this paper presents that Laodaizhanggou Pb-Zn deposit is a high-middle temperature magmatic hydrothermal filling metasomatic deposit formed during the Late Yanshanian period. This study has a certain reference value for the exploration of the same type of lead-zinc deposits in the south of Ruyang. |
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