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木里县梭罗沟金矿床赋矿围岩凝灰熔岩年代学、 地球化学特征及矿床成因
- 作者：
魏永峰|罗巍|王莫理|廖炳勇|庞俊琪|周福篯|赵京
- 作者单位：
- 四川黄金股份有限公司|成都理工大学地球与行星科学学院|自然资源部四川木里难选冶金矿野外科学观测研究站| 四川省地质矿产勘查开发局区域地质调查队| 四川黄金集团有限公司
基金项目：
- 四川省自然资源厅科技项目（Kj-2022-（27））
详细信息：
- 作者简介：
- 魏永峰（1974—），男，正高级工程师，博士研究生，从事区域地质矿产调查与矿产勘查工作；E?mail：39387530@qq. com
- PDF下载
Geochronological and geochemical characteristics of the host tuff lava and genesis of the Suoluogou Gold Deposit, Muli County
- English Author：
Wei Yongfeng1,2,3, Luo Wei4,5, Wang Moli1,3, Liao Bingyong1,3, Pang Junqi1,3, Zhou Fujian4,5, Zhao Jing4,5
- Unit：
- （1. Sichuan Gold Co., Ltd.; 2. College of Earth and Planetary Sciences, Chengdu University of Technology; 3. Sichuan Muli Refractory Gold Ore Field Scientific Observation and Research Station, Ministry of Natural Resources; 4. Regional Geological Survey Brigade, Sichuan Bureau of Geological and Mineral Exploration and Development; 5. Sichuan Gold Group Co., Ltd.）
- 摘要
- 在线预览
- 参考文献
摘要:
梭罗沟金矿床作为甘孜—理塘结合带内的大型金矿床，其赋矿围岩凝灰熔岩研究比较薄弱。以凝灰熔岩作为研究对象，开展了岩相学、地球化学、锆石U-Pb定年研究，厘定岩石形成时代，揭示岩石成因及其形成的构造环境，以深化对梭罗沟金矿床成矿条件的认识。锆石U-Pb定年结果显示，凝灰熔岩结晶年龄为 246.5 Ma±1.6 Ma，形成时代为中三叠世早期；地球化学特征表明，凝灰熔岩具有较高 Mg、Fe、Ti 特征，w（La）N/w（Yb）N值为 10.71～17.75，δEu 为 0.88～0.97，富集 Rb、Th等大离子亲石元素及 Nb、Ta、Ce、Zr、Hf、Ti等高场强元素，暗示凝灰熔岩为具有裂谷背景的 OIB钾玄质系列碱性铁质玄武岩。凝灰熔岩的形成与含石榴石、尖晶石二辉橄榄岩部分熔融有关，显示出岩石圈地幔物质的印记。凝灰熔岩成因可以解释为受地幔热柱或热点诱导的软流圈物源上涌至岩石圈地幔后发生一定程度的物质混合，混合岩浆受岩石圈伸展减压而发生较低程度的部分熔融，岩浆在侵位过程中未遭受明显的中上地壳混染。在甘孜—理塘洋盆关闭和陆弧碰撞过程中，分散金活化、运移形成了凝灰熔岩矿源层，伴随着陆内造山，受地下热液和热变质作用驱动，深部初始矿源层及凝灰熔岩矿源层中的金、铜等成矿元素进一步活化、运移、富集或叠加富集，形成了梭罗沟金矿床。
关键词:
凝灰熔岩；锆石U-Pb定年；地球化学；梭罗沟；金矿床；木里县；赋矿围岩
Abstract:
The Suoluogou Gold Deposit, a large-scale gold deposit within the Garze-Litang suture zone, has limited research on its host tuff lava. This study focuses on petrography, geochemistry, and zircon U-Pb dating of the tuff lava to determine the rock formation age, reveal its petrogenesis and tectonic setting, and enhance understanding of themetallogenic conditions of the Suoluogou Gold Deposit. Zircon U-Pb dating yields a tuff lava crystallization age of 246.5 Ma + 1.6 Ma, indicating an Early Middle Triassic formation. Geochemical analyses show that the tuff lava is characterized by high Mg, Fe, and Ti contents, with w(La),/w(Yb), values of 10.71-17.75, 6Eu values of 0.88-0.97, and enrichment in large-ion lithophile elements (e.g., Rb, Th) and high-field-strength elements (e.g., Nb, Ta, Ce, Zr, Hf, Ti).These features suggest that the tuff lava belongs to an OIB-type alkaline mafic basalt series formed in a rift-related setting. The tuff lava originated from partial melting of garnet-and spinel-bearing Iherzolite, reflecting contributions from the lithospheric mantle. The petrogenesis can be attributed to upwelling of asthenospheric materials induced by mantle hot plumes or hotspots, which mixed with lithospheric mantle materials to some extent. The mixed lava under-went low-degree partial melting under lithospheric extension and decompression, without significant crustal contamina-tion during emplacement. During the closure of the Garze-Litang oceanic basin and subsequent continent arc colli-sion, dispersed gold was activated and migrated to form the gold-bearing tuff lava source layer. With later intracontinen-tal orogeny, driven by hydrothermal and thermal metamorphism, Au and Cu from both the initial deep-source layer and the tuff lava source layer were further activated, mobilized, enriched, or superimposed enriched, ultimately forming the Suoluogou Gold Deposit.
Keywords:
tuff lava; zircon U-Pb dating; geochemistry; Suoluogou; gold deposit; Muli County; host rock
