| 江南造山带湖南段金矿成矿事件及其构造背景 |
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| 引用本文： | 柏道远,李彬,周超,孙骥,魏方辉,曾广乾,姜文,李银敏,蒋启生.江南造山带湖南段金矿成矿事件及其构造背景[J].岩石矿物学杂志,2021,40(5):897-922. |
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| 作者姓名： | 柏道远 李彬 周超 孙骥 魏方辉 曾广乾 姜文 李银敏 蒋启生 |
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| 作者单位： | 湖南省地质调查院, 湖南 长沙 410016;湖南省地质调查院, 湖南 长沙 410016;东华理工大学 核资源与环境国家重点实验室, 江西 南昌 330013;湖南省地质调查院, 湖南 长沙 410016;中国地质科学院 地质力学研究所, 北京 100081 |
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| 基金项目： | 中国地质调查局项目（DD20160031-04,DD20160346-17）;湖南省地勘局科研项目（201901）;湖南省地质院科研项目（201917）;国家重点研发计划"深地资源勘查开采"重点专项课题（2017YFC0601506）;湖南省自然资源厅科研项目（2017-03,2019-02） |
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| 摘 要： | 江南造山带湖南段为一重要的金成矿带,目前关于带内金矿形成的时代背景存在较大争议。本文基于区域成岩成矿年代学、矿床(区)地质特征、矿床成因和流体来源、区域构造演化背景等多方面资料,对带内各主要金矿区的成矿时代逐一进行详细解析,以此为基础重新厘定了区域金矿成矿地质事件及其时代,并探讨了各成矿事件的构造背景,初步形成以下认识。江南造山带湖南段主要发生了加里东期、印支晚期和燕山期等3期金成矿事件。加里东期金矿成矿年代为430～410 Ma(志留纪后期),产于同期雪峰冲断带的中段-西南段和东段东部、湘中-湘东南构造岩浆带的东北部等3个地区,各区赋矿地层分别为板溪群、冷家溪群、冷家溪群,前两个地区的成矿与加里东运动变质变形和构造活化作用有关,后一个地区的成矿与志留纪后期花岗质岩浆活动提供热能和流体有关。印支晚期金矿成矿年代为227～202 Ma(晚三叠世),主要分布于同期雪峰冲断带东南缘构造岩浆隆起带,与后碰撞花岗质岩浆活动的热能和热液驱动有关。燕山期金矿成矿年代为152～130 Ma(晚侏罗世—早白垩世初),主要分布于同期雪峰冲断带东南部构造岩浆隆起带的东部,与伸展环境下的花岗质岩浆活动有关。
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| 关 键 词： | 江南造山带 金成矿事件 加里东期 印支晚期 燕山期 湖南 |
| 收稿时间： | 2020/10/9 0:00:00 |
Gold mineralization events of the Jiangnan Orogen in Hunan and their tectonic settings |
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| BAI Dao-yuan,LI Bin,ZHOU Chao,SUN Ji,WEI Fang-hui,ZENG Guang-qian,JIANG Wen,LI Yin-min,JIANG Qi-sheng.Gold mineralization events of the Jiangnan Orogen in Hunan and their tectonic settings[J].Acta Petrologica Et Mineralogica,2021,40(5):897-922. |
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| Authors: | BAI Dao-yuan LI Bin ZHOU Chao SUN Ji WEI Fang-hui ZENG Guang-qian JIANG Wen LI Yin-min JIANG Qi-sheng |
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| Institution: | Hunan Institute of Geology Survey, Changsha 410016, Hunan, China;Hunan Institute of Geology Survey, Changsha 410016, Hunan, China;State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;Hunan Institute of Geology Survey, Changsha 410016, Hunan, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | The Jiangnan Orogen in Hunan is an important gold metallogenic belt. There are debates about the gold ore-forming ages and geological settings of the belt. According to the ages of magmatic rocks and deposits, as well as geological charateristics of deposits, metallogeny and ore-forming fluids and regional tectonic evolutions, the authors analysed the metallogenic ages of every major ore concentration area in the Jiangnan Orogen in Hunan, and then defined the gold mineralization events and their ages, probed into the tectonic settings of the events. The following preliminary ideas are put forward. There occurred mainly three gold mineralization events in Jiangnan Orogen such as Caledonian, late Indosinian and Yanshanian. The Caledonian gold deposits with ore-forming age of 430~410 Ma (late Silurian) were located in the three areas, such as the middle-southwestern segment of Xuefeng thrust-fault zone, the eastern segment of Xuefeng thrust-fault zone, and northeastern Central-Southeastern Hunan tectonomagmatic belt in the same time, with ore-bearing strata Banxi Group, Lengjiaxi Group and Lengjiaxi Group respectively. Gold mineralization in the first two areas was related with metamorphism, deformations and structural activation caused by Caledonian Movement, while in the last area was related with the thermal energy and hydrotherm provided by late Silurian granitic magmatism. The late Indosinian gold deposits with ore-forming age of 227~202 Ma (Late Triassic) took place mainly in southeastern Xuefeng tectonomagmatic uplift zone in Indosinian, and were related with the thermal energy and hydrotherm caused by post-collisional granitic magmatism. The Yanshanian gold deposits with ore-forming age of 152~130 Ma (Late Jurassic-initial Early Cretaceous) were mainly took place in east part of southeastern Xuefeng tectonomagmatic uplift zone in the same time, and were related with the granitic magmatism in extensional environment. |
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| Keywords: | Jiangnan Orogen gold mineralization events Caledonian late Indosinian Yanshanian Hunan |
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