| 湖南省主要内生成矿事件的构造格局控矿特征及动力机制 |
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| 引用本文： | 柏道远,李彬,姜文,李银敏,蒋启生.湖南省主要内生成矿事件的构造格局控矿特征及动力机制[J].地球科学与环境学报,2020(1):49-70. |
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| 作者姓名： | 柏道远 李彬 姜文 李银敏 蒋启生 |
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| 作者单位： | 湖南省地质调查院;东华理工大学核资源与环境国家重点实验室 |
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| 基金项目： | 中国地质调查局地质调查项目(DD20160346-17,DD20160031);湖南省地质调查院科研项目(2019-1) |
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| 摘 要： | 湖南省内生矿产资源丰富,内生成矿事件主要有加里东期(以志留纪为主)、印支晚期(晚三叠世)、燕山中晚期(晚侏罗世-早白垩世)等3期。以区域矿产资料为基础,结合大地构造、成岩成矿年龄、矿床成因机制等研究成果,对上述3期内生成矿事件的构造格局控矿特征和动力机制进行探讨。①受加里东运动自东南向西北扩展以及深部岩石圈结构差异控制,加里东期湖南省自东南往西北分为成矿特征有别的3个构造带。湘中-湘东南构造岩浆带(Ⅰ)发生后碰撞花岗质岩浆活动,于局部产生与岩浆活动相关的W、萤石等成矿作用;雪峰构造带(Ⅱ)东部的雪峰冲断带(Ⅱ1)形成了以构造活化成因为主的金矿和锑金矿;雪峰构造带(Ⅱ)西部的武陵低缓褶皱带(Ⅱ2)及湘西北构造抬升带(Ⅲ)内形成了与寒武纪同沉积断裂活动、加里东运动后的伸展活动以及相应的热液活动有关的汞铅锌矿。②印支晚期受深部岩石圈结构差异控制,湖南省自东南至西北分为3个构造带:湘中-湘东南构造岩浆带(Ⅰ)因后碰撞减压熔融而发生大规模花岗质岩浆活动,从而于其东南部形成钨锡铅锌多金属矿床,西北部形成锑金钨多金属矿床;雪峰构造带(Ⅱ)可能无内生热液成矿作用;湘西北褶皱带(Ⅲ)发育小型脉型铅锌矿。③燕山中晚期,湖南省自东南往西北分为3个构造带:湘中-湘东构造岩浆带(Ⅰ)受岩石圈拆沉、软流圈上隆、陆内碰撞后期增温减压、俯冲板块崩塌等深部构造作用控制而发生大规模花岗质岩浆活动,形成了大量的有色金属矿床和金矿床;雪峰西部构造带(Ⅱ)成矿作用弱,局部存在Au、Hg成矿作用;湘西北褶皱带(Ⅲ)发育少量低温热液充填型萤石矿和砷矿。
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| 关 键 词： | 内生成矿 构造格局 动力机制 成矿年龄 加里东期 印支晚期 燕山中晚期 湖南 |
Tectonic Framework Controlling Characteristics and Dynamic Mechanisms of Main Endogenous Mineralization Events in Hunan Province,China |
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| BAI Dao-yuan,LI Bin,JIANG Wen,LI Yin-min,JIANG Qi-sheng.Tectonic Framework Controlling Characteristics and Dynamic Mechanisms of Main Endogenous Mineralization Events in Hunan Province,China[J].Journal of Earth Sciences and Environment,2020(1):49-70. |
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| Authors: | BAI Dao-yuan LI Bin JIANG Wen LI Yin-min JIANG Qi-sheng |
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| Institution: | (Hunan Institute of Geological Survey,Changsha 410116,Hunan,China;State Key Laboratory of Nuclear Resourcesand Environment,East China University of Technology,Nanchang 330013,Jiangxi,China) |
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| Abstract: | Hunan province is rich in endogenic minerals,which are formed mainly in three mineralization events such as Caledonian(mainly Silurian),Late Indosinian(Late Triassic)and Middle-Late Yanshanian(Late Jurassic-Early Cretaceous).Based on regional mineral data and achievements of geotectonic,diagenetic and metallogenic ages,the tectonic framework controlling characteristics and dynamic mechanisms of the three endogenous mineralization events were discussed.①In Caledonian,controlled by the expanding of Caledonian movement and deep lithosphere structural differences,Hunan province could be divided into three tectonic belts with different mineralization characteristics from southeast to northwest.In the central-southeastern Hunan tectono-magmatic belt(Ⅰ),there occurred post-collisional granitic magmatism,which caused W and fluorite deposits locally;in Xuefeng thrust-fault zone(Ⅱ1)of the eastern Xuefeng tectonic belt(Ⅱ),there occurred Au and Au-Sb deposits related mainly with structural activation;in Wuling gentle fold zone(Ⅱ2)of the western Xuefeng tectonic belt(Ⅱ)and in the northwestern Hunan tectonic lifting belt(Ⅲ),there occurred Hg-Pb-Zn deposits related with Cambrian synsedimentary faults,extension after Caledonian movement and hydrothermal activity.②In Late Indosinian,controlled by deep lithosphere structural differences,Hunan province could be divided into three tectonic belts from southeast to northwest.In the central-southeastern Hunan tectono-magmatic belt(Ⅰ),there occurred larger-scale post-collisional granitic magmatism for the weakening of stress,which caused W-Sn-Pb-Zb-polymetallic deposits in the southeast and Sb-Au-W-polymetallic deposits in the northwest;Xuefeng tectonic belt(Ⅱ)maybe has no endogenous hydrothermal mineralization;in the northwestern Hunan fold belt(Ⅲ),there occurred small vein type of Pb-Zn deposits.③In Middle-Late Yanshanian,Hunan province could be divided into three tectonic belts from southeast to northwest.In the central-southeastern Hunan tectono-magmatic belt(Ⅰ),there occurred larger-scale granitic magmatism due to deep tectonisms such as lithospheric delamination,upwelling of asthenosphere mantle,temperature rising and stress weakening after intracontinental collision,and subduction plate collapse,and accordingly enormous norferrous and Au deposits were formed;in the western Xuefeng tectonic belt(Ⅱ),there occurred weak mineralization with Au,Hg deposits locally;in the northwestern Hunan fold belt(Ⅲ),there occurred a few low temperature hydrothermal filling fluorite and As deposits. |
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| Keywords: | endogenous mineralization tectonic framework dynamic mechanism metallogenic age Caledonian Late Indosinian Middle-Late Yanshanian Hunan |
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