西藏错那洞穹窿同构造矽卡岩特征及相关铍钨锡稀有金属矿化的成矿时代

doi:10.13278/j.cnki.jjuese.20190285

吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (5): 1304-1322.doi: 10.13278/j.cnki.jjuese.20190285

• 整装勘查区矿床成因与成矿作用研究专辑 • 上一篇下一篇

西藏错那洞穹窿同构造矽卡岩特征及相关铍钨锡稀有金属矿化的成矿时代

付建刚¹, 李光明¹, 王根厚², 张林奎¹, 梁维¹, 张小琼³, 焦彦杰¹, 董随亮¹

1. 中国地质调查局成都地质调查中心, 成都 610081;
2. 中国地质大学(北京)地球科学与资源学院, 北京 100083;
3. 雅安市自然资源和规划局, 四川雅安 625000

收稿日期:2019-08-20 出版日期:2020-09-26 发布日期:2020-09-29
通讯作者: 李光明(1965-),男,研究员,主要从事矿产资源勘查与评价、区域成矿规律与成矿预测方面的研究,E-mail:13982257109@163.com E-mail:13982257109@163.com
作者简介:付建刚(1987-),男,博士,主要从事构造地质与成矿理论方面的研究,E-mail:fujiangangcd@163.com
基金资助:
国家自然科学基金项目（91955208，41602214）；中国地质调查局项目（DD20190147）；科学技术部第二次青藏高原综合科学考察研究（2019QZKK0806）；国家科学技术部重大研发计划项目（2019YFC0605201，2018YFC0604103，2016YFC060308）

Syntectonic Skarn Characteristics and Mineralization Age of Associated Be-W-Sn Rare Metal Deposit in Cuonadong Dome, Southern Tibet, China

Fu Jiangang¹, Li Guangming¹, Wang Genhou², Zhang Linkui¹, Liang Wei¹, Zhang Xiaoqiong³, Jiao Yanjie¹, Dong Suiliang¹

1. Chengdu Center, China Geological Survey, Chengdu 610081, China;
2. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
3. Bureau of Land and Resources Ya'an, Ya'an 625000, Sichuan, China

Received:2019-08-20 Online:2020-09-26 Published:2020-09-29
Supported by:
Supported by National Natural Science Foundation of China (91955208, 41602214), Project of China Geological Survey (DD20190147), Second Tibetan Plateau Scientific Expedition and Research Program (2019QZKK0806) and Ministry of Science and Technology Program (2019YFC0605201, 2018YFC0604103, 2016YFC060308)

摘要/Abstract

摘要： 错那洞穹窿位于北喜马拉雅片麻岩穹窿带（NHGD）的东段，是近年来新发现的穹窿构造。穹窿由内向外依次由核部、滑脱系和盖层三部分组成，错那洞铍钨锡稀有金属矿化主要赋存在穹窿滑脱系的矽卡岩和矽卡岩化大理岩中，矿体产在含石榴子石十字石云母片岩中，与强烈变形的淡色花岗岩或伟晶岩密切相关，部分矽卡岩矿物呈定向排列，具强烈的剪切特征；淡色花岗岩与矽卡岩的接触关系部分呈渐变接触，部分呈突变关系，表明矽卡岩与该期岩浆关系密切，矽卡岩与淡色花岗岩属于同构造的产物。本次研究获得错那洞穹窿滑脱系含石榴子石十字石云母片岩中黑云母Ar-Ar坪年龄为（16.6±0.3）Ma，反等时线年龄为（16.7±0.3）Ma，该年龄代表第二期由南向北伸展构造变形时间，即藏南拆离系（STDS）在错那洞穹窿的活动时间；含白云母的矽卡岩化大理岩中白云母Ar-Ar坪年龄为（16.9±0.2）Ma，与含石榴子石十字石云母片岩中黑云母Ar-Ar年龄一致，代表同构造矽卡岩的形成时间，也是错那洞铍钨锡稀有金属矿床的成矿时间。错那洞铍钨锡稀有金属矿床形成于由藏南拆离系强烈活动引起的伸展减薄构造背景，减压熔融形成的岩浆沿着构造通道上涌侵位，并与围岩交代反应形成同构造矽卡岩及其中的富铍钨锡矽卡岩型矿体。

关键词: 同构造矽卡岩, 稀有金属, Ar-Ar测年, 错那洞穹窿, 错那洞铍钨锡稀有金属矿床, 北喜马拉雅

Abstract: The newly discovered Cuonadong dome is located in the eastern part of the northern Himalayan gneiss domes (NHGD), which consists of three lithologic-tectonic units, i.e., core, detachment system,and cover rocks. Cuonadong super-large Be-W-Sn rare metals deposit is hosted by skarn and skarn marble in the middle of the dome. The skarn and/or skarnization marble are located in garnet-staurolite-bearing mica schist, and are closely related to the intensively deformed leucogranite and pegmatite, and some skarn minerals are in directional arrangement with strong shear characteristics (i.e. garnet, epidote and amphibole). The boundary between leucogranite and skarn is gradual or sharp, which suggests that both the skarn and the deformed leucogranite were resulted from the syntectonic magmatism.The Ar-Ar dating of biotite from the ore-hosting schist yields Ar-Ar plateau age of (16.6±0.3) Ma and inverse isochronal age of (16.7±0.3) Ma, which represent the age of D₂ top-to north extension deformation, and also represent the activity time of the southern Tibetan detachment system (STDS) of Cuonadong dome. The Ar-Ar dating of muscovite from skarn in Cuonadong dome yields Ar-Ar plateau age of (16.9±0.2) Ma, which is consistent with the Ar-Ar plateau age of (16.6±0.3) Ma in schist, and represent the formation age of the syntectonic skarns, which is interpreted as the mineralization age of Cuonadong Be-W-Sn rare metals deposit. Therefore, we suggest that Cuonadong Be-W-Sn rare metals deposit was resulted from the activity of the STDS, and the syntectonic magma intruded in the host rocks along the structural passage, further replaced the marble, which, in turn, resulted in the formation of the Be-W-Sn-bearing skarn ore bodies.

Key words: syntectonic skarn, rare metals, Ar-Ar dating, Cuonadong dome, Cuonadong Be-W-Sn rare metals deposits, north Himalaya

中图分类号:

P597

付建刚, 李光明, 王根厚, 张林奎, 梁维, 张小琼, 焦彦杰, 董随亮. 西藏错那洞穹窿同构造矽卡岩特征及相关铍钨锡稀有金属矿化的成矿时代[J]. 吉林大学学报(地球科学版), 2020, 50(5): 1304-1322.

Fu Jiangang, Li Guangming, Wang Genhou, Zhang Linkui, Liang Wei, Zhang Xiaoqiong, Jiao Yanjie, Dong Suiliang. Syntectonic Skarn Characteristics and Mineralization Age of Associated Be-W-Sn Rare Metal Deposit in Cuonadong Dome, Southern Tibet, China[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1304-1322.

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西藏错那洞穹窿同构造矽卡岩特征及相关铍钨锡稀有金属矿化的成矿时代

Syntectonic Skarn Characteristics and Mineralization Age of Associated Be-W-Sn Rare Metal Deposit in Cuonadong Dome, Southern Tibet, China

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