郯庐断裂中段管帅拉分盆地的确定及其构造意义  

DETERMINATION OF GUANSHUAI PULL-APART BASIN ALONG THE MIDDLE SECTOR OF TAN-LU FAULT AND ITS TECTONIC IMPLICATIONS

作　　者：周建波[1] 程日辉[1] 刘建辉[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《地质科学》2005年第4期486-498,共13页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金(编号:40272100);国家油气专项(编号:XQ-2004-07)资助成果。

摘　　要：管帅盆地是郯庐断裂中段产出受左阶式走滑断裂控制的白垩纪盆地。该盆地长约30km,宽15km,具长宽比近于2∶1的菱形构造格架。盆地内白垩纪王氏群的沉积时代为距今116～73Ma,总沉积厚度>3470m,沉积速率>80cm/103a;主体以冲积扇相—河流湖泊相沉积为主;同沉积构造发育,沉积相变剧烈,沉积中心侧向迁移特征明显,并与边界断裂的走滑效应具有一致性,具有拉分盆地典型的构造背景、构造格架及沉积特征。确定管帅盆地为郯庐断裂白垩纪走滑过程中形成的拉分盆地,并在此基础上分析了郯庐断裂左阶式走滑活动的构造特征及其对管帅拉分盆地的控制作用。The Guanshuai Basin, situated in the middle sector of the Tan-Lu fault, was a Cretaceous basin with a length being 30 km and a width being 15 km, whose development was obviously controlled by sinistrial strike-slip faulting of the fault zone. The basin itself showed a rhombus structure framework with 2 ： 1 proportion between its length and width. The sedimentation of the Late Cretaceous Wangshi Group yielded ages of 116 -73 Ma, with a thickness being more than 3 470 m and the sedimentation rate greater than 80 cm/10^3a. The main part of the Wangshi Group was sediments of alluvial fan facies and river-lacustrine facies. The syn-sedimentary structures developed well, the facies changed obviously, and the sedimentary center migrated laterally during the sedimentary period, which was consistent with the strike-slip effect of the basin boundary faults. The basin possessed typical characteristics of a pull-apart basin, such as tectonic background, structure framework and sedimentary features. The evidence indicated that the Guanshuai Basin was a pull-apart one formed during the process of strike-slip movement of the Tan-Lu fault zone in Cretaceous. Based on what mentioned above, the sinistral strike-slipping characteristics and controlling factors on the Guanshuai pull-apart basin of the middle sector of the the Tan-Lu fault were analysed.

关 键 词：拉分盆地 郯庐断裂中段 白垩纪沉积 左阶式断裂 

分 类 号：P542[天文地球—构造地质学]