| 东大别山北缘姚河岩体与边部糜棱岩带的研究及其地质意义 |
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| 引用本文： | 杨坤光,马昌前,许长海,杨巍然. 东大别山北缘姚河岩体与边部糜棱岩带的研究及其地质意义[J]. 地震地质, 1998, 20(4): 18 |
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| 作者姓名： | 杨坤光 马昌前 许长海 杨巍然 |
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| 作者单位： | 中国地质大学 |
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| 摘 要： | 位于东大别山北缘的姚河岩体是最近确定的中侏罗世石英二长岩体，角闪石４０Ａｒ ３９Ａｒ法定年为１５５．８Ｍａ，用角闪石压力计法得出结晶压力为（２．６５±０．５）×１０２ＭＰａ，结晶定位深度约９ｋｍ。岩体北缘发育的ＮＥ倾的糜棱岩带是磨子潭 晓天断裂韧性剪切的结果。对剪切带中宏观标志及显微、超显微构造研究表明，该断裂自中侏罗世之后主要表现为上盘向ＮＥ方向下滑的正断层，两盘垂直差异隆升达９ｋｍ。结合区域构造及深部资料分析显示，东大别造山带并不具有“翻花状”双侧造山链特点
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| 关 键 词： | 糜棱岩 剪切带 正断层 大别山 |
A STUDY OF THE YAOHE PLUTON AND ITS NORTHERN DUCTILE SHEAR ZONE AT NORTHEASTERN MARGIN OF THE DABIE MOUNTAIN |
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| Yang Kunguang Ma Changqian Xu Changhai Yang Weiran. A STUDY OF THE YAOHE PLUTON AND ITS NORTHERN DUCTILE SHEAR ZONE AT NORTHEASTERN MARGIN OF THE DABIE MOUNTAIN[J]. Seismology and Geology, 1998, 20(4): 18 |
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| Authors: | Yang Kunguang Ma Changqian Xu Changhai Yang Weiran |
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| Abstract: | The Yaohe pluton, found at the northeastern margin of the Dabie mountain recently, is a quartz diorite intrusive body. A precise 40 Ar/ 39 Ar hornblende dating age demonstrates that it had emplaecd in middle Jurassic (155.8Ma). The aluminum in hornblende geobarometer analysis indicates the crystallization pressure of this pluton is about (2.65±0.5)×10 5Pa,and its emplaced depth is about 9km. Mylonite zone in the northern margin of the Yaohe pluton, those foliations dipping to NE directio |
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| Keywords: | Mylonite Shear zone Normal fault Dabie mountain |
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