| 雅砻江下游河谷下部松散沉积物的时代与变形的初步研究 |
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| 引用本文： | 陈富斌,赵永涛.雅砻江下游河谷下部松散沉积物的时代与变形的初步研究[J].地震地质,1985,7(3):33. |
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| 作者姓名： | 陈富斌 赵永涛 |
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| 作者单位： | 中国科学院成都地理研究所
(陈富斌)，中国科学院成都地理研究所(赵永涛) |
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| 摘 要： | 本文根据沉积环境分析和~(14)C测龄结果,确定沿雅砻江下游河床分布的一套未成岩的河湖相地层的时代为晚更新世晚期—全新世早期,而不是长期以来归之于早更新世的昔格达组,建议称其为桐子林组;并通过该地层变形成因的分析,提出李明久-桐子林断裂带在全新世中期活动显著的认识
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| 关 键 词： | 昔格达组 湖积层 雅砻江下游 松散沉积物 级阶 垂直断距 晚更新世晚期 断裂带 全新世中期 擦痕 |
PRELIMINARY STUDY ON AGE AND DEFORMATION FOR CONSOLIDATED SEDIMENTS IN THE BASE OF THE VALLEY, THE LOWER REACH OF THE YALONG RIVER |
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| Abstract: | Tongzilin and Ertan etc.,are located in the lower reach of the Yalong River,a sequence of less dense sediments in the bottom of the valley named Xigeda Formation (Early Pleistocene) with a thickness of 70m.14C dating indicates an age ranging from 23000-10000 yrs for the lacustrine deposit,suggesting a time spanning Late Pleistocene and Early Holocene for the Tongzilin Formation.Tectonic deformation of the succession leads to a east-dipping sequences,the development of extension-torsion fault and compression fault,and a set of X-shaped jointa,suggesting that this area showed a tendency to uplift rapidly |
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