| 铜陵矿集区“拖带”凹陷与无规边界形成机理的流变实验研究 |
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| 引用本文： | 黄定华,邓军,王庆飞,李学军,张强,韦延光.铜陵矿集区“拖带”凹陷与无规边界形成机理的流变实验研究[J].地学前缘,2004,11(1):161-167. |
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| 作者姓名： | 黄定华 邓军 王庆飞 李学军 张强 韦延光 |
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| 作者单位： | 1. 中国地质大学,地球科学学院,湖北,武汉,430074;中国地质大学,"岩石圈构造、深部过程及探测技术"教育部重点实验室,北京,100083
2. 中国地质大学,"岩石圈构造、深部过程及探测技术"教育部重点实验室,北京,100083 |
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| 基金项目： | 国家自然科学基金重点项目(40234051);教育部跨世纪优秀人才培养计划与科学技术研究重点项目(01037,03178);国土资源部科技专项计划(20010103);国家重点基础研究发展规划项目(1999043206) |
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| 摘 要： | 微板块拼合之后 ,板内盖层部分常因强烈变形而重新形成为若干次级地质单元 ,后者多发育不规则的边界形态和特殊的构造组合。为认识其形成机理 ,进一步了解板内变形的某些特殊现象乃至普适规律 ,对铜陵矿集区进行了以景观重塑为目的的变形模拟。结果发现 ,即使原本相对规则和均一的构造单元 ,在周围地区的夹持和围限下 ,也有可能因经历复杂的“挤压—剪切—旋转—拖带”式递进变形 ,而在两个对峙的角顶部位发育一种特殊的“拖带”凹陷 ,并最终形成不规则的地质边界。前者可视作板内变形特有的区域尺度流变构造 ,而后者则是板内变形条件下的一种必然产物
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| 关 键 词： | 板内变形 模拟实验 拖带凹陷 无规边界 铜陵矿集区 |
| 文章编号： | 1005-2321(2004)01-0161-07 |
| 修稿时间： | 2003年11月26 |
THE RHEOLOGICAL EXPERIMENTAL STUDY ON THE FORMATION MECHANISM OF "DRAG DEPRESSIONS" AND IRREGULAR BOUNDARIES IN TONGLING ORE DEPOSIT CONCENTRATED AREA |
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| HUANG Ding-hua.THE RHEOLOGICAL EXPERIMENTAL STUDY ON THE FORMATION MECHANISM OF "DRAG DEPRESSIONS" AND IRREGULAR BOUNDARIES IN TONGLING ORE DEPOSIT CONCENTRATED AREA[J].Earth Science Frontiers,2004,11(1):161-167. |
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| Authors: | HUANG Ding-hua |
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| Institution: | HUANG Ding-hua~ |
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| Abstract: | Almost all intraplate caprocks had experienced strong deformation during the convergence of microplates, and then disintegrated into secondary geologic units with irregular boundaries and particular structural assemblages. In order to understand the formation mechanism of these special phenomenon, a rheological experiment of structural scenery in Tongling has been carried out. The result shows that the originally regular and uniform boundary of Tongling block became irregular caused by the enclosing and confinement of surrounding units within the “compression-shear-rotation-drag” process. Simultaneously, two specific “drag depressions” developed at the opposite corners of the block. The former phenomenon can be regarded as the characteristic regional-scale rheological effect of intraplate deformation and the latter may represent the necessary outcome of intraplate deformation. |
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| Keywords: | intraplate deformation simulation experiment drag depression irregular boundary Tongling ore deposit concentrated district |
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