Characteristics and significance of seismites in the Pleistocene in southwestern margin of Qaidam Basin

doi:10.7605/gdlxb.2011.06.007

JOURNAL OF PALAEOGEOGRAPHY ›› 2011, Vol. 13 ›› Issue (6): 657-664. doi: 10.7605/gdlxb.2011.06.007

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Characteristics and significance of seismites in the Pleistocene in southwestern margin of Qaidam Basin

Zhu Meng, Li Dewei, Liu Demin, Zhu Yunhai, Luo Wenxing, Qin Yadong

Faculty of Earth Sciences，China University of Geosciences(Wuhan)，Wuhan 430074，Hubei

Received:2011-08-02 Revised:2011-09-14 Online:2011-12-01 Published:2011-12-01
About author:Zhu Meng，a candidate for master degree in China University of Geosciences(Wuhan)，is engaged in comprehensive researches of neotectonic.
About the corresponding author Li Dewei， professor and Ph.D. supervisor of China University of Geosciences(Wuhan), is engaged in teaching and research of continental dynamics.

柴达木盆地西南缘更新统震积岩特征及其意义^*

朱萌李德威刘德民朱云海罗文行秦雅东

中国地质大学（武汉）地球科学学院，湖北武汉 430074

通讯作者: 通讯作者简介李德威，男，1962年生，中国地质大学（武汉）教授，博士生导师，主要从事大陆动力学的教学和研究 E-mail:zhumengdizhi@163.com
作者简介:朱萌，男，1986年生，主要从事新构造研究，现为中国地质大学（武汉）在读硕士研究生。E-mail:zhumengdizhi@163.com。
通讯作者简介李德威，男，1962年生，中国地质大学（武汉）教授，博士生导师，主要从事大陆动力学的教学和研究。E-mail:dewei89@sina.com。
基金资助:
中石油东方公司项目“柴西南—东昆仑地区区域构造研究”（编号：2010016303）、中国地调局青海1：5万中灶火地区四幅区调项目（编号：1212010918021）与教育部长江三峡库区地质灾害研究中心开放基金项目(编号：TGRC201005）共同资助

Abstract

Abstract: A great deal of soft-sediment deformation structures with seismite characteristic were found in the lacustrine strata of the Pleistocene in the southwestern margin of Qaidam Basin.Soft-sediment deformation markers mainly include liquefied sandstone(mudstone)vein，liquefied breccia，load structure，ball-pillow structure，liquefied convolute deformation structure etc.，and the syn-seismic structure deformation markers were also developed including large-scale syn-seismic fault，seismic fissure，syn-fold.The discovery of seismites in the southwestern Qaidam Basin indicates that tectonic movements were frequent and intense since the Pleistocene along the northern margin of the Kunlun Mountain and in the Qaidam Basin.The seismites made it possible to study the tectonic activities since the Pleistocene which has important significance for the study of the Qinghai-Tibet Plateau，basin-mountain coupling and paleo-earthquakes.

Key words: seismite, Qaidam Basin, Pleistocene, palaeoearthquake

摘要： 在柴达木盆地西南缘更新统湖相地层中发现了大量具有震积岩特征的软沉积物变形构造，层内发育有液化砂（泥）岩脉、液化角砾岩、负荷构造、火焰构造、球—枕状构造、液化卷曲变形层等一系列软沉积物变形标志，此外剖面内还发育了大型同震断层、震裂缝、同震褶皱等一系列同震构造变形标志。该区震积岩的发现表明，更新世以来昆仑山北缘及柴达木盆地地区仍处于频繁而强烈的活动状态，通过震积岩层可以更加深入地了解柴达木盆地更新世以来构造活动状况，这对于研究青藏高原隆升及其盆山耦合、古地震活动等都有着十分重要的意义。

关键词: 震积岩, 柴达木盆地, 更新统, 古地震

CLC Number:

P512.2

Zhu Meng, Li Dewei, Liu Demin, Zhu Yunhai, Luo Wenxing, Qin Yadong. Characteristics and significance of seismites in the Pleistocene in southwestern margin of Qaidam Basin[J]. JOURNAL OF PALAEOGEOGRAPHY, 2011, 13(6): 657-664.

朱萌李德威刘德民朱云海罗文行秦雅东. 柴达木盆地西南缘更新统震积岩特征及其意义^*[J]. 古地理学报, 2011, 13(6): 657-664.

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柴达木盆地西南缘更新统震积岩特征及其意义^*