米仓山西段晚元古代-古生代层序地层及地层模型  

THE SEQUENCE STRATIGRAPHY AND STRATIGRAPHIC MODEL OF THE LATE PROTEROZOIC AND THE PALAEOZOIC EAR IN THE WESTERN SECTION OF THE MICANG SHAN,SICHUAN

作　　者：徐新煌[1] 朱利东[1] 刘登忠[1] 赵兵[1] 

机构地区：[1]成都理工学院

出　　处：《矿物岩石》1997年第S1期12-20,共9页Mineralogy and Petrology

摘　　要：米仓山西段位于扬子地台北缘，该区除缺乏泥盆系和石炭系外，各时代地层均有发育。从震旦系灯影组至二叠系大隆（或长兴）组可划分出１３个相当于Ⅱ～Ⅲ级沉积旋回的层序或复合层序，并建立了地层模型。地台边缘的层序地层和沉积体系域具有它自身的某些特点。由局部构造活动引起的相对海平面变化，对沉积体系域和界面类型有着明显的影响。但是，在这种情况下形成的沉积序列和其它特征，与相应的典型体系域相比有一定的差异。为此，我们引用或引入了上超体系域（ＯＳＴ）、滨浅海边缘楔（ＳＭＷ）、最大海泛沉积层（ＭＦＳ）和Ⅲ类层序界面等概念。There is located on Northern margin of Yangtze Platform the western section of the Micangshan,where are exposed stratigraphies of all epoches except the Devonian and Carboniferous.The stratigraphies including the Late Proterozoic Era and the Palaeozoic Era can be divided into thirteen sequences or complex sequences,which cerrespond to Ⅱ or Ⅲ cycle of sedimentation.The sequence stratigraphies and depositional system tracts distributed on the margin of the platform are of some characteristics.The relative changes of sea level caused by local tectonism have had distinct effect on depositional system tracts and types of boundary of the sequence stratigraphy.But the depositional sequences and other characteristics formed in this situation have some differential characteristics which are compared with that of typical and corresponding depositional system tracts.For this reason,we offer a few of new concepts-overlapping system tract(OST),marginal wedge located on shore-shoallow sea(SMW),Sedimentary stratum during the most flooding sea level(MFS) and Ⅲ type of boundary plane of the sequence stratigraphy et al.

关 键 词：层序地层 地层模型 沉积体系域特点 米仓山西段 

分 类 号：P534.3[天文地球—古生物学与地层学]