| 三江特提斯复合造山与成矿作用研究进展 |
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| 引用本文： | 邓军,杨立强,王长明.三江特提斯复合造山与成矿作用研究进展[J].岩石学报,2011,27(9):2501-2509. |
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| 作者姓名： | 邓军 杨立强 王长明 |
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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 |
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| 基金项目： | 本文受国家重点基础研究发展规划(2009CB421008)、教育部新世纪优秀人才支持计划(NCET-09-0710)、高等学校学科创新引智计划(B07011)和教育部长江学者和创新团队发展计划(IRT0755)联合资助. |
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| 摘 要： | 国家973规划项目"三江特提斯复合造山与成矿作用"实施3年来,在成矿动力学背景、增生造山成矿系统、碰撞造山成矿系统、构造体制转换与复合叠加成矿作用、成矿预测理论和勘查技术集成等方面取得了重要进展。(1)厘定了原特提斯、古特提斯、新特提斯和陆陆碰撞等一系列重要的区域构造-岩浆事件及其动力学背景,提出存在较大规模的燕山期构造-岩浆-成矿事件。(2)划分了被动边缘盆地型、活动边缘多岛弧盆型和大洋盆地型3个VMS型Cu-Pb-Zn成矿子系统,确立了玉龙和格咱-香格里拉斑岩型Cu矿带印支期岩浆作用的贡献及俯冲岛弧构造环境。(3)沉积岩容矿Pb-Zn-Cu-Ag多金属矿床的形成贯穿于印-亚大陆碰撞的三个演化阶段,成矿年代由南向北逐渐变新;它包括2套子系统:脉状Cu成矿系统,与变质流体活动有关,成矿物质来自深部地壳和浅部沉积地层的混合;Pb-Zn(-Cu-Ag)成矿系统,与盆地流体活动有关,成矿物质主要来自沉积地层。(4)金沙江-哀牢山斑岩型Cu(Au)成矿系统形成于35Ma左右,受控于印-亚大陆碰撞导致的地壳增厚。(5)造山型Au成矿系统主要发育在哀牢山金矿带,三期金成矿作用发生于~62Ma、~35Ma和28Ma左右,分别受控于印-亚碰撞早期的强烈汇聚挤压、早-晚期转换构造动力学体制。(6)区域存在3期重要构造体制转换事件:增生造山→碰撞造山、主碰撞→晚碰撞和晚碰撞→后碰撞,前两者控制区域斑岩铜矿带、沉积岩容矿多金属矿带和造山型金矿带,后者控制了沱沱河盆地中的Pb-Zn矿床。(7)最典型的叠加成矿系统为VMS 型Cu-Pb-Zn与斑岩型Cu叠加成矿系统,主要发育于羊拉-红山-普朗-铜厂沟矿集区、云县-景谷、江达-维西和昌宁-孟连成矿带。(8)探索成矿预测理论与方法,并选择羊拉-红山-普朗-铜厂沟矿集区为重点地区,开展隐伏矿体预测工作,取得找矿进展。本专辑论文基本覆盖了上述各个方面的研究进展,论文涉及4个主题:成矿动力学背景、增生造山成矿系统、碰撞造山成矿系统、构造体制转换与复合叠加成矿作用。
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| 关 键 词： | 三江特提斯 复合造山 成矿动力学背景 构造体制转换 叠加成矿系统 |
| 收稿时间： | 2011/6/10 0:00:00 |
| 修稿时间： | 8/3/2011 12:00:00 AM |
Research advances of superimposed orogenesis and metallogenesis in the Sanjiang Tethys |
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| DENG Jun,YANG LiQiang and WANG ChangMing.Research advances of superimposed orogenesis and metallogenesis in the Sanjiang Tethys[J].Acta Petrologica Sinica,2011,27(9):2501-2509. |
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| Authors: | DENG Jun YANG LiQiang and WANG ChangMing |
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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;State Key laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The significant achievements in past three-year of superimposed orogenesis and metallogenesis in the Sanjiang Tethys, the National 973-Program, are briefly summarized in this paper, including the metallogenic geodynamic setting, the metallogenic systems of accreting orogen and collisional orogen, the transition of tectonic regime and superimposed orogenesis, the metallogenic forecasting theory and the exploration techniques. (1) The metallogenic geodynamic setting of the proto-, paleo-, neo-Tethys and continental collision have been built up, and the large-scale tectonics-magmatism-metallogenic event during the Yanshanian has been proposed. (2) VMS Cu-Pb-Zn metallogenic systems have been divided into three types: the passive continental margin type, the active continental margin type, and ocean basin type. Studies showed that the metallogenesis in the Yulong and Xianggelila porphyry Cu metallogenic belt was related to the Indian magmatic activities. (3) Sediment-hosted Pb-Zn-Cu-Ag deposits formed at the three stages of the Indo-Asia collisional orogen, which include two metallogenic systems: the vein Cu systems are related to metamorphic fluids from both of the deep crust and shallow sedimentary strata, and Pb-Zn-Cu-Ag systems are related to basin fluids from the shallow sedimentary strata. (4) Porphyry Cu metallogenic system in the Jinshajiang-Ailaoshan belt formed in the age of 35Ma±, which is controlled by the crust thickness from the Indo-Asia collisional orogen. (5) Orogenic gold deposits occurred in three tectonic-thermal events: the earlier convergence regime of India-Eurasia at 62Ma±, and the transition of tectonic regime at the later stage of 35Ma± and 28Ma. (6) There have been occurred three stages of the transition of tectonic regime in the Sanjiang Tethys: from the accreting orogen to the collisional orogen, from the main collision to late collision, and from late collision to post-collision. The former two controlled the formation of porphyry Cu belts, sediment-hosted Pb-Zn-Cu-Ag belts, and orogenic gold belts. However, the latter controlled the formation of Pb-Zn deposits in the Tuotuohe basin. (7) Both VMS-type Cu-Pb-Zn and porphyry Cu systems are classical superimposed metallogenesis in the Sanjiang Tethys, which both occur in the Yangla-Hongshan-Pulang-Tongchanggou ore concentrating area, and Yunxian-Jinggu, Jiangda-Weixi and Changning-Menglian metallogenic belts. (8) In terms of the metallogenic forecasting theory and exploration techniques, the undiscovered mineral resources in the Yangla-Hongshan-Pulang-Tongchanggou ore concentrating area have been evaluated. This special issue has introduced the significant achievements from twenty eight papers including four aspects as follows: the metallogenic geodynamics background, metallogenic system of accreting orogen, metallogenic system of collisional orogen, transition of tectonic regime and superimposed orogenesis. |
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| Keywords: | Sanjiang Tethys Superimposed orogenesis Geodynamic setting Transition of tectonic regime Superimposed metallogenesis |
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