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。
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.
出处
《古地理学报》
CAS
CSCD
北大核心
2011年第6期657-664,共8页
Journal of Palaeogeography：Chinese Edition
基金
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)
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
关键词
震积岩
柴达木盆地
更新统
古地震
seismite, Qaidam Basin, Pleistocene, palaeoearthquake
