郯庐断裂中段石场-中楼拉分盆地的确定  

DETERMINATION OF SHICHANG ZHONGLOU PULL APART BASIN IN NIDDLE SECTION OF TANCHENG LUJIANG FAULT

作　　者：周建波[1] 胡克[1] 申宁华 赵达 宫田隆夫 

机构地区：[1]长春科技大学地球科学系 [2]国立神户大学

出　　处：《地质科学》1999年第1期18-28,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金

摘　　要：郯庐断裂中段石场－中楼一带，产出一长宽比近于２：１的菱型构造盆地。盆地内早白垩世莱阳群的沉积厚度大于６２６３．７１ｍ，沉积速率大于０．３９２ｍｍ／ａ，主体以火山岩及火山碎屑浊积岩为主，同沉积构造发育、沉积相变剧烈、沉积中心沿边界断层的走滑运动方向迁移，具形成拉分盆地的典型构造背景、构造格架及沉积特征。The Yihe Shuhe Fault is the main part of the Tancheng Lujiang Fault. It shows a very clear trackway of strike slip structures in early Cretaceous. The Shichang Zhonglou Basin sited in the middle part of the Yihe Shuhe Fault. Laiyang group (135—119 Ma) formed at the same time of the regional strike slip movement in this basin. The length of the basin is 60 km and the width is 30 km. The length to width ratio is nearly 2:1 and it was a rhombochasm basin. It had the pull apart basin characters with typical structure frame. The thickness of the Laiyang group was bigger than 6263.71 m and the sedimentation rate was more than 0.392 mm/a. The main sedimental facies includes turbid flow sediment of river and lake facies, lake facies and ocean facies. It shows that the basin was deep and nerrow. The sedimentary speed was fast and the sedimentary facies changed rapidly. Along the boundary faults distributed a lot of synchronous structures of slip collapses piles and convolute beddings. The wide spreaded turbid sediment shows that boundary movement was very strong. Volcanic rocks formed on the background of strike slip structures in the basin and the sedimentary center of the basin moved towared north direction. It indicates that the boundary faults were left lateral strike slip. The sediment synchronously formed with strike slip. All of these show that Shichang Zhonglou Basin was a pull apart basin formed in sinistral strike slip process of the Tancheng Lujiang fault.

关 键 词：郯庐断裂 拉分盆地 早白垩世 石场-中楼 盆地 

分 类 号：P544.4[天文地球—构造地质学]