| 论中国大陆复杂和混杂的碰撞带构造 |
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| 引用本文： | 万天丰.论中国大陆复杂和混杂的碰撞带构造[J].地学前缘,2004,11(3):207-220. |
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| 作者姓名： | 万天丰 |
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| 作者单位： | 中国地质大学,北京,100083 |
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| 摘 要： | 中国大陆碰撞带是以结构复杂、形成过程复杂和物质成分趋于混杂为主要特征的。在构造特征上 ,表现为由构造岩片和混杂岩带所组成 ,形成扇状褶皱和对冲型逆掩断层。在剖面上常形成楔状(鳄鱼式 )构造 ,在平面上可构成嵌入构造 ,它们其实是两个板块在碰撞过程中互相挤压、缩短与穿插的、一个统一的三维共轭剪切断裂系统中的不同表现形式。绝大多数中国大陆碰撞带都不是一次形成的 ,而是经历了多期次、活动性质各不相同的、复杂的形成过程。为了进一步提高碰撞带的研究水平 ,应该把碰撞带及其两侧的板块当作一个整体来进行综合研究 ,应该大力加强碰撞带周邻板块的沉积古地理、生物古地理、古地磁学、地球化学和构造变形、变位资料的系统研究。碰撞作用时期是元素、岩石和构造单元趋于混杂的时期 ,而不是有利于元素、物质的分异和富集。碰撞带的主碰撞期形成的矿床是十分有限的。笔者推测有 4种类型的矿床可能将成为西部古碰撞带地区找矿的主要目标。
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| 关 键 词： | 碰撞带 板块构造 楔状和嵌入构造 多期次构造事件 成矿作用 |
| 文章编号： | 1005-2321(2004)03-0207-14 |
| 修稿时间： | 2004年7月15日 |
On the complex and mixed collision zones in China Continent |
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| Wan Tian-feng.On the complex and mixed collision zones in China Continent[J].Earth Science Frontiers,2004,11(3):207-220. |
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| Authors: | Wan Tian-feng |
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| Abstract: | The collision zones in China Continent are mainly characterized by complex structures, complex forming processes and mixed materials. They are composed of tectonic sheets and mélanges, forming a series of fan folds and ramp thrusts. Usually they take the form of wedging tectonics (crocodile tectonics) in the section and show as indentation tectonics on the plane, which are the different manifestations of a conjugated shear fracture system in three dimensions, formed by mutual compression, shortening and alternating in the collision between the plates. Most of collision zones in China continent were not formed on one occasion, but formed through complex processes with multi-tectonic events and different geological actions. In order to improve the research on collision zone, we should make comprehensive study of collision zone and its adjacent plates, and devote major efforts to the research on the sedimentary paleo-geography, paleo-biogeography, paleo-magnetism, geochemistry, rock deformation and block displacement for the plates surrounding the collision zone. The collision tends to mixed up the elements, rocks and tectonic units, but is not favorable to the differentiation and concentration of elements and materials. The formation of ore deposits in main collision stage is limited. The author infers that four types of ore deposits may be the major targets for exploration in paleo-collision zones of western China. |
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| Keywords: | collision zone plate tectonics wedging and indentation tectonics multi-tectonic event mineralization |
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