| 云南金顶铅锌矿成矿时代厘定:来自沥青Re-Os同位素证据 |
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| 引用本文： | 孙鹏程,李超,周利敏,屈文俊,王登红,高兰,李伟,李欣尉,赵鸿,杜安道.云南金顶铅锌矿成矿时代厘定:来自沥青Re-Os同位素证据[J].地球科学,2021,46(12):4247-4259. |
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| 作者姓名： | 孙鹏程 李超 周利敏 屈文俊 王登红 高兰 李伟 李欣尉 赵鸿 杜安道 |
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| 作者单位： | 1.国家地质实验测试中心, 北京 100037 |
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| 基金项目： | 国家自然科学基金41873065科技部重点研发计划项目2020YFA0714800 |
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| 摘 要： | MVT型铅锌矿由于成矿温度低，目前没有发现十分合适的定年矿物，此外，由于多期成矿作用叠加以及成矿物质存在多元混合，严重制约了对此类矿床成矿年代学研究.前人对云南金顶超大型MVT铅锌矿床成因、物质来源、成矿条件等方面研究取得了重要成果，但对其形成时代各有所云，至今仍未定论.笔者在总结了大量前人研究成果的基础上，通过对跑马坪和架崖山矿段沥青样品开展Re-Os同位素定年研究，表明古油藏形成于59.1 Ma，金顶铅锌矿床的形成时代可能为27.7 Ma.早期的油气藏为后期铅锌矿的形成提供了十分重要的条件，穹隆构造为金属成矿提供了储矿空间，由于遭受构造及热液作用的破坏，油气裂解释放大量的还原性物质，为Pb、Zn等成矿物质迁移、富集、沉淀提供了重要载体，进而形成了金顶超大型铅锌矿床.研究结果表明，沥青Re-Os同位素不仅能够为MVT型铅锌矿床成矿年龄的厘定提供一种有效的技术途径，同时还能够为油气藏的生成、破坏等事件发生时代提供有利依据.
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| 关 键 词： | MVT型铅锌矿 Re-Os 成矿时代 动力学背景 沥青 矿床 |
| 收稿时间： | 2021-04-21 |
Dating Metallogenic Age of Jinding Pb-Zn Deposit in Yunnan: Evidence from Re-Os Isotope of Bitumen |
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| Abstract: | Due to the low mineralization temperature, no suitable dating minerals have been found in the MVT type lead-zinc deposit at present. In addition, due to the superposition of multi-stage mineralization and the existence of multiple mixing of ore-forming materials, it seriously restricted the study on mineralization chronology of this type of deposit. Some achievements have been made on the genesis, material source and metallogenic conditions of the super-large MVT lead-zinc deposit in Jinding, Yunnan. However, the age of deposit formation is still uncertain. On the basis of summarizing a large number of previous study results and combining the Re-Os isotopic dating results of fresh bitumen samples taken from Paomaping and Jiayashan ore sections, it shows that the ancient oil reservoirs was formed at 59.1 Ma, and the formation age of Jinding lead-zinc deposit might be 27.7 Ma. Ancient reservoirs are of greatly important condition on formation of lead-zinc mine, the tectonic domes provided storage space for metal mineralization. On account of the structure and hydrothermal process in damage, cracking of oil and gas meantime release large amounts of reducing substances, which provides important carrier for Pb, zinc and other ore-forming materials migration, enrichment and precipitation, thus formed the Jinding super-large Pb-Zn deposit. The results confirm that asphalt Re-Os isotope can not only provide an effective technical way to determine the metallogenic age of MVT type lead-zinc deposit, but also provide a favorable basis for the generation and destruction age of the oil and gas reservoirs. |
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