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南秦岭造山带韧性剪切系中—晚侏罗世运动学分析与力学机制探讨

DOI: 10.11867/j.issn.1001-8166.2015.01.0069, PP. 69-77

Keywords: 南秦岭构造带,宁陕断裂带,安康断裂带,最大有效力矩准则,中—,晚侏罗世

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Abstract:

南秦岭构造带为商丹缝合线以南的秦岭造山带部分。构造分析与同构造年代学研究证实该构造带内发育2条中—晚侏罗世区域性共轭韧性剪切带,即ENE向宁陕左旋韧性剪切带和NW向安康右旋韧性剪切带,其剪切变形年龄分别为169~162Ma和178~163Ma。通过对2条韧性剪切带的线理测量分析,反演其最大主压应力的方位约为NE向,与2条共轭韧性剪切带的钝角平分线一致,符合最大有效力矩准则。据此确定中—晚侏罗世秦岭造山带主要受控于NESW向区域性构造挤压作用,大致以秦岭造山带最狭窄部位(汉南—米仓山杂岩体)为界,其内部地块受ENE向与NW向共轭韧性剪切系控制,存在分别向西与向东的构造挤出活动。这一运动学模式可能代表了秦岭造山带中—晚侏罗世的主体变形方式。

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