| 复合造山和复合成矿系统:三江特提斯例析 |
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| 引用本文： | 邓军,王庆飞,李龚健.复合造山和复合成矿系统:三江特提斯例析[J].岩石学报,2016,32(8):2225-2247. |
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| 作者姓名： | 邓军 王庆飞 李龚健 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083,中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083,中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083 |
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| 基金项目： | 本文受国家重点基础研究发展计划“973”项目（2015CB452606、2009CB421008）资助. |
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| 摘 要： | 提出复合造山定义,认为复合造山指多期次造山以及其它类型壳幔过程(裂谷作用、地幔柱活动、克拉通减薄等)在同一构造带先后发生或者多类型过程同时同位发生的地质事件;复合造山是大洋闭合-大陆拼贴过程的必然演化结果、地质历史时期普遍存在的地质过程,其具有不同属性板块拼接、多条蛇绿岩套与岛弧带并列、构造格架继承与改造、物质活化与循环运动以及构造体制转换突出等特征;复合造山带成矿时代长,类型多样,金属富集强度大,大型矿集区集中。复合成矿系统指在特定时-空域中,不同时期多种成矿作用或者同一时期不同成矿作用复合形成的成矿系统。复合成矿表现为成矿物质继承改造或成矿作用融合交叉,导致成矿元素多幕式富集,成矿空间广,成矿强度大,成矿概率增加。复合成矿系统分为多期复合和同期复合两类。复合造山驱动了复合成矿系统的形成,其是中国区域成矿典型特色。复合造山和复合成矿系统在特提斯构造带最为典型,中国西南三江造山带是典型解剖区。构建了古生代与中生代原-古-中-新特提斯洋闭合引发的增生造山和新生代印度-欧亚大陆汇聚导致的碰撞造山过程,厘定了增生造山海底喷流型Cu-Pb-Zn-Ag、增生-碰撞造山岩浆热液型CuMo-Sn-W、碰撞造山盆地卤水-岩浆热液型Pb-Zn-Ag-Cu和碰撞造山斑岩-矽卡岩型Au-Cu-Mo四类典型复合成矿系统。
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| 关 键 词： | 复合造山 复合成矿系统 深部驱动 特提斯 三江 |
| 收稿时间： | 3/1/2016 12:00:00 AM |
| 修稿时间： | 5/2/2016 12:00:00 AM |
Superimposed orogeny and composite metallogenic system: Case study from the Sanjiang Tethyan belt, SW China |
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| DENG Jun,WANG QingFei and LI GongJian.Superimposed orogeny and composite metallogenic system: Case study from the Sanjiang Tethyan belt, SW China[J].Acta Petrologica Sinica,2016,32(8):2225-2247. |
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| Authors: | DENG Jun WANG QingFei and LI GongJian |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China,State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China and State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | Superimposed orogeny is defined that two or more types of tectonics, including accretionary orogeny, collisional orogeny, and other types of mantle-crust activation, such as rifting, decratonization, mantle pluming, occurred successively or simultaneously in one tectonic unit. Superimposed orogeny is the inevitable result from the tectonic evolution including paleo-ocean closure and continent amalgamation, and thus present ubiquitously in the earth''s history. During the superimposed orogenic processes represented in the Sanjiang region, SW China, conspicuous features were recognized, such as juxtaposition of continental blocks with different tectonic affinities, paralleling of multistrand ophiolite complex and island arc, modification of tectonic framework, reactivation and circulation of mantle and crust material, and transformation of the tectonic regimes. In most cases, metallogenic belts associated with superimposed orogenic process have a long term of mineralization, diverse genetic types of ore deposits, high enrichment of polymetallic minerals, and high probability of production of large ore cluster regions. Composite metallogenic system includes that two metallogenic processes occurred in different episodes of the superimposed orogeny and that of those occurred simultaneously in one tectonic belt. The former is called multiperiod type and the later called synchronous one. Composite metallogenesis is characterized by the inheritance and overlapping of ore metals in different episodes, and by combination of various synchronous metallogenesis. This will lead to the multi-phase enrichment of ore elements, and enhancement of the possibility of metallogeny, and thus the increasement of mineralized space and intensity. Driven by the superimposed orogeny, the composite metallogenesis is a salient feature of the regional metallogeny in China, and amongst it, the Sanjiang Tethyan orogenic belt is suitable for case study. The metallogenic system in the Sanjiang was constructed by the accretionary orogen caused by the subduction and closure of Proto-, Paleo-, Meso- and Neo-Tethyan ocean in Paleozoic and Mesozoic, and the Cenozoic collisional orogen between Indian and Eurasian plates. This paper divided four types of composite metallogenic systems, as accretionary orogenic VMS type (Cu-Pb-Zn-Ag), accretionary-collisional orogenic magmatic-hydrothermal type (Cu-Mo-Sn-W), collisional orogenic MVT-magmatic-hydrothermal type (Pb-Zn-Ag-Cu), and collisional orogenic porphyry-skarn type ore deposits in the Sanjiang belt. |
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| Keywords: | Superimposed orogeny Composite metallogenic system Deep geodynamics Tethys Sanjiang |
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