| 马尼干戈盆地河流阶地特征及其构造成因 |
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| 引用本文： | 谭亮,夏月成,江仁剑,龚彬,葛俊杰,马昌威.马尼干戈盆地河流阶地特征及其构造成因[J].四川地质学报,2014(4):484-488. |
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| 作者姓名： | 谭亮 夏月成 江仁剑 龚彬 葛俊杰 马昌威 |
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| 作者单位： | 四川省核工业地质调查院,四川省金核矿业有限公司,成都610065 |
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| 摘 要： | 马尼干戈第四系盆地河流阶地具有"砾石分选、磨圆差,分层结构不明显"的物质组成、"沿玉曲河南岸单侧发育、具菱形状阶地"的分布和形态及"第Ⅲ级阶地因次第升降而裂解"的构造特征等。因此推断马尼干戈盆地可能是区域上三大构造单元—"南部义敦群域辗掩系统(义敦岛弧带)、中部结合群域原地系统(甘孜-理塘结合带北段)和北部西康群域辗掩系统(西康群)"晚近期不均衡抬升(块断升降)引起局部断陷成盆、并叠加左行走滑拉分而形成的。这一发现对松潘-甘孜造山带第四纪新构造期活动的研究具有重要意义。
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| 关 键 词： | 河流阶地 新构造运动 不均衡抬升 马尼干戈 |
Characteristics and Tectonic Origin for River Terrace in the Maniganggo Basin |
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| TAN Liang,XIA Yue-cheng,JIANG Ren-jian,GONG Bin,GE Jun-jie,MA Chang-wei.Characteristics and Tectonic Origin for River Terrace in the Maniganggo Basin[J].Acta Geologica Sichuan,2014(4):484-488. |
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| Authors: | TAN Liang XIA Yue-cheng JIANG Ren-jian GONG Bin GE Jun-jie MA Chang-wei |
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| Institution: | (Sichuan Institute of Geological Survey for Nuclear Industry, Chengdu 610061) |
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| Abstract: | River terrace as a Quaternary sedimentary body formed by cutting and depositing in various stages of river development is characterized by composition, distribution, morphological and structure which resulted from the tectonic setting. River terraces in the Maniganggo basin are mostly composed of gravel with poor sorting and roundness, and without dualistic structure. Meanwhile they were developed along one bank of the Yuqu River, and are rhombohedral in shape. Terrace 11 split out due to elevation and subsidence. These characteristics could be attributed to differential uplift of such three tectonic units as ＂Yidun Group nappe system （i.e. Yidun arc） in south, plate suture group autochthonous system （i.e. Garze-Litang plate suture zone） in middle and Xikang Group nappe system （i.e. Xikang Group） ＂ which resulted in block faulting. This is importance to neotectonism in the Songpan-Garze orogen. |
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| Keywords: | river terraces Songpan-Garz6 orogen neotectonism differential uplift strike-slip andpull-apart |
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