| 湖南锡田钨锡多金属矿田燕山期NE向断层演化历史及其成矿意义 |
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| 引用本文： | 刘飚,吴堑虹,李欢,奚小双,孔华,曹荆亚,蒋江波,林智炜,吴经华,梁伟. 湖南锡田钨锡多金属矿田燕山期NE向断层演化历史及其成矿意义[J]. 地球科学, 2021, 46(1): 43-58. DOI: 10.3799/dqkx.2019.263 |
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| 作者姓名： | 刘飚 吴堑虹 李欢 奚小双 孔华 曹荆亚 蒋江波 林智炜 吴经华 梁伟 |
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| 作者单位： | 中南大学地球科学与信息物理学院,湖南长沙 410083;中南大学地球科学与信息物理学院,湖南长沙 410083;中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙 410083 |
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| 基金项目： | 中国地质调查局整装勘查区 |
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| 摘 要： | 为了确定湖南锡田矿田燕山期NE向断层演化历史、蚀变特征及与钨锡成矿关系本文调查了矿田内燕山期断层野外宏观特征,对断层中充填石英脉进行了显微鉴定、阴极发光、含矿元素分析,结果显示:(1)断层以NE60°～70°平行分布于茶汉盆地南北两侧,均倾向茶汉盆地,断层的陡倾、棱角状角砾及梳状石英等指示了断层的张性性质;(2)断层经...
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| 关 键 词： | 正断层 流体活动 W-Sn成矿 锡田矿田 矿物学 |
| 收稿时间： | 2019-10-21 |
Yanshanian NE-Striking Fault Evolution and Its Implications on Mineralization in the Xitian W-Sn Polymetallic Ore Field,Hunan Province |
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| Liu Biao,Wu Qianhong,Li Huan,Xi Xiaoshuang,Kong Hua,Cao Jingya,Jiang Jiangbo,Lin Zhiwei,Wu Jinghua,Liang Wei. Yanshanian NE-Striking Fault Evolution and Its Implications on Mineralization in the Xitian W-Sn Polymetallic Ore Field,Hunan Province[J]. Earth Science-Journal of China University of Geosciences, 2021, 46(1): 43-58. DOI: 10.3799/dqkx.2019.263 |
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| Authors: | Liu Biao Wu Qianhong Li Huan Xi Xiaoshuang Kong Hua Cao Jingya Jiang Jiangbo Lin Zhiwei Wu Jinghua Liang Wei |
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| Affiliation: | (School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University,Changsha 410083,China) |
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| Abstract: | In order to determine the fault activity history and its relationship with hydrothermal alteration and W-Sn mineralization,we investigated the field characteristics of the Yanshanian faults in the Xitian ore field and carried out microscopic identification,cathodoluminescence and ore-forming element analysis on quartz in faults. The results show that:(1) The faults are distributed in northern and southern sides of the Chahan basin and dipping to the basin,with striking directions of NE 60°-70°. High dip angles,angular breccias and pectination quartz veins in the faults indicate extensional characteristics. (2) Three stages of magmatic fluid activities occurred in the faults. The stage Ⅰ is characterized by quartz veins occurring as coarse quartz particles (0.5-15.0 mm) with local deformation and fragmentation structures. The stage Ⅱ and stage Ⅲ are typically quartz veins filling in tensile fractures with small quartz particles (0.01-2.00 mm). Moreover,stage Ⅱ quartz develops microcrack structures while stage Ⅲ quartz is idiomorphic and unreformed,suggesting a progressively weakening trend of fault deformation. (3) In contrast to stage Ⅰ and stage Ⅲ mica-free quartz veins,stage Ⅱ quartz veins involve more micas with the high contents of W and Sn elements and minor scheelites and pyrites,which show similar compositional evolutionary characteristics to that of the W-Sn deposits in the Xitian ore field. (4) The distribution of Yanshanian mineralization in the Xitian ore field is closely related to the normal faults,showing clear and regular mineralizing zonation of W-Sn and Pb-Zn deposits from the south to the north on each side of the Chahan Basin. Under the control of extensional tectonic setting of the South China Block during Yanshanian,the comprehensive extension resulting from mantle uplift and remelted magmatic intrusion may be a potential mechanism for the formation of normal faults. The extensional environment of the normal faults was favorable to accumulation of magmatic hydrothermal fluids; and the normal faults provided a channel for the migration of ore-forming hydrothermal fluids. |
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| Keywords: | normal faults fluid activity W?Sn mineralization Xitian ore field mineralogy |
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