| 北京西山的深部韧性滑脱剪切带 |
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| 引用本文：许志琴,王方国,符振康.1985.北京西山的深部韧性滑脱剪切带[J].地球学报,7(1):37-53. |
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| 中文摘要:通过对中朝板块北缘的北京西山地区的变形相和“a”型褶皱、箭鞘褶皱、拉伸线理、布丁等微形构造的研究,通过对该区石英、白云母、方解石、透闪石等矿物塑性变形及旋转应变的研究,通过对岩石组构、变形、变质作用及有限应变的分析,认为在北京西山存在一条以震旦系下马岭组为主滑脱面的地壳深层韧性滑脱剪切带,变形机制为简单剪切,运动方向自东往西。北京西山这一高应变构造带的发现为研究北京西山以至整个地台区地壳深部构造形式及动力学问题提供了重要信息。 |
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| DUCTILE DECOLLEMENT SHEAR ZONE IN XISHAN OF BEIJING |
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| Abstract:At the depth of the crust in Xishan, Beijing, exists a comparatively large ductile decollement shear zone extenting from east to west, distributed within the limits of more than 1 km above and below the main boundary plane that is represented by chloritoid-mica phyllites belonging to the Xia-maling Formation of the Sinian. Since in the shear zone are developed "a"-type folds, sheath folds and extensional lineations, indicating shear vector, and minerals here possess strong plastic flow and rotated strain, it is considered to be a planar middle-high pressure dynamic metamorphic belt. Limited strain analyses suggest that this is the result of simple shear mechanism. Recognition of the high strain zone can give some important informationconcerning intrastructure patterns and geodynamics of Xishan in the Sino-Korean Platform. |
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