塔里木盆地库鲁克塔格志留纪海退沉积和构造背景  

Silurian regressive sedimentation and tectonic background in Kuruktag of Tarim Basin

作　　者：王步清[1,2] 黄少英[1] 程日辉[3] 肖中尧[1] 王璞珺[3] 王腾飞[3] 杨宝俊[3] 

机构地区：[1]塔里木油田公司研究院,新疆库尔勒841000 [2]中国国土资源经济研究院,北京101149 [3]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2013年第1期54-62,共9页World Geology

基　　金：塔里木油田项目"塔里木盆地基底构造特征研究"(041011080018);国家重点基础研究发展计划"973"项目(2006CB701403)联合资助

摘　　要：塔里木盆地东北缘的库鲁克塔格断隆区志留系土什布拉克组顶部的河流沉积是本区古生界第一次出现的陆相地层,表明志留纪本区发生了大规模的海退事件,由滨--浅海转变为陆相冲积环境。向上变粗的沉积序列反映出盆地的快速充填。志留系顶部的大规模角度不整合、志留系由海相转变为陆相的充填特征、前陆隆起和火山弧造山带的物源区背景反映出盆地发育的挤压构造背景。隆升的库鲁克塔格北缘的前陆隆起和火山弧造山带成为库鲁克塔格志留纪盆地的物源区。该区志留纪的海退事件是在前陆隆升的背景下发生的。志留纪盆地是在震旦—奥陶纪裂谷盆地基础上发育的,这种前陆性质盆地的形成与南天山洋自东向西逐渐闭合和塔里木板块顺时针旋转有关;志留纪盆地的发育与消亡代表了塔里木盆地震旦纪—志留纪—泥盆纪的拉张--挤压成盆旋回的结束。The fluvial sediments in the top of Silurian Tushibulake Formation was the first occurrence of Paleozoic continental strata, which suggested that there was a great sea regression happened during Silurian in Kuruktag of northeastern Tarim Basin, and the environment changed from shore-shallow marine to continental impact. The upward-coarsening sedimentary succession reflected the fast filling of Tarim Basin. The angular unconformity in a large area on the top of Silurian, the filling characteristics changed from marine to continental facies, the prove- nance background of foreland uplift and volcanic arc orogen revealed the eompressional tectonic background of the basin. The uplifted northern margin of Kurugtag and the volcanic are orogen were the provenances of the Silurian basin in Kurugtag. This Silurian regression in Kuruktag happened under the background of the basinward uplifting. The Silurian basin developed on the basis of Sinian-Ordovician basin, which related to the closing of Nantianshan Ocean from east to west and the clockwise rotation of Tarim Plate. The development and ending of the Silurian basin in this area represented the ending of a basin forming cycle from Sinian- Silurian-Devonian under the situations from extension to compression.

关 键 词：塔里木盆地 库鲁克塔格 志留纪 海退事件 构造背景 

分 类 号：P534.43[天文地球—古生物学与地层学] P512.32[天文地球—地质学]