| 秦岭商丹断裂带南侧弧前沉积体的变形特征及其构造意义 |
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| 引用本文： | 李加好,宋传中,Lin Shoufa,任升莲,王道轩,涂文传,张欢.秦岭商丹断裂带南侧弧前沉积体的变形特征及其构造意义[J].地质科学,2013,0(3):638-646. |
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| 作者姓名： | 李加好 宋传中 Lin Shoufa 任升莲 王道轩 涂文传 张欢 |
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| 作者单位： | 1. 合肥工业大学资源与环境工程学院 合肥 230009;
2. Department of Earth and Environmental Science, University of Waterloo, Canada |
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| 摘 要： | 本文选取秦岭商丹断裂带以南,南秦岭刘岭群以北的弧前沉积体为研究对象,研究扬子板块向北秦岭俯冲的运动学特征。这套弧前沉积体产状北倾,矿物拉伸线理为倾向线理,岩片强烈褶皱,断裂发育,表现出由北向南逆冲的运动学特征。利用糜棱岩与云母石英片岩中矿物变形温度计,结合石英C轴组构估算岩石变形温度集中在400℃～550℃之间。结合其所处的构造位置,本文认为这套强烈变形的岩石构造组合体形成于秦岭古岛弧弧前沉积背景,在扬子板块向北秦岭俯冲过程中,北秦岭沿着商丹带由北向南逆冲形成。后期又遭受商丹韧性剪切带左行走滑活动的改造。
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| 关 键 词： | 秦岭造山带 商丹断裂带 弧前沉积体 构造变形 EBSD |
| 收稿时间： | 2012-04-16 |
| 修稿时间： | 2012-04-16; |
Deformation characteristic of fore-arc sedimentary system on the southern margin of Shangnan-Danfeng fault belt in Qinling orogenic belt and its tectonic significance |
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| Li Jiahao,Song Chuanzhong,Shoufa Lin,Ren Shenglian,Wang Daoxuan,Tu Wenchuan,Zhang Huan.Deformation characteristic of fore-arc sedimentary system on the southern margin of Shangnan-Danfeng fault belt in Qinling orogenic belt and its tectonic significance[J].Chinese Journal of Geology,2013,0(3):638-646. |
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| Authors: | Li Jiahao Song Chuanzhong Shoufa Lin Ren Shenglian Wang Daoxuan Tu Wenchuan Zhang Huan |
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| Institution: | 1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009;
2. Department of Earth and Environmental Science, University of Waterloo, Canada |
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| Abstract: | Fore-arc sedimentary system, located to the southern side of Shang-dan fault belt, and separated from the Devonian Liuling group of the south Qinling belt by ductile shear zone on the southern side, is well investigated to study the kinematic of subduction of Yangtze plate to north Qinling orogenic belt.Fore-arc sedimentary system is highly deformed with NNE-dipping foliation and dipping mineral stretching lineation.Folds and faults are well developed in this area due to southward thrusting.Mineral deformation thermometer and quartz C-axis fabric are used to estimate deformation temperature of mylonite and mica quartz schist.The result showed that deformation temperature is concentrated between 400℃～500℃.Considering its tectonic location, we think that it was formed in fore-arc sedimentary background, then undergone thrust from north to south along Shang-Dan fault belt due to subduction of Yangtze plate to north Qinling orogenic belt, and experienced left strike-slip of Shang-Dan shear zone lately. |
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| Keywords: | Qinling orogenic belt Shang-Dan fault belt Fore-arc sedimentary system structural deformation EBSD |
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