摘要
通过对各类层序界面的识别,以沉积特征、副层序和体系域与结构转换面等层序分析,进行露头层序地层学研究,将湘西北慈利 大庸地区台缘斜坡相区上震旦统—下寒武统划分为11个Ⅲ级层序,其中上震旦统7个、下寒武统4个,主要是Ⅱ型层序。在区域层序地层对比、分析的基础上初步讨论了露头层序地层分析中存在的问题。
The Cili-Dayong region in northwestern Hunan lay on the passive continental margin of the southeastern Yangtze landmass during the Late Sinian to Cambrian. The bulk of the Upper Sinian strata are represented by the carbonate rocks, while the Lower Cambrian strata consist dominantly of a variety of shales and limestones. The above-mentioned strata within the platform-margin to slope facies zones are divided in this study, on the basis of sequence boundary, depositional characteristics, parasequences, systems tracts and transitional surfaces and outcrop sequence stratigraphy, into eleven third-order type 2 sequences, including seven for the Upper Sinian strata and four for the Lower Cambrian strata. Other aspects of outcrop sequence stratigraphic analysis are dealt with as well.
出处
《沉积与特提斯地质》
CAS
CSCD
2003年第4期27-33,共7页
Sedimentary Geology and Tethyan Geology
基金
国家自然科学基金及重点项目(40072038
49972046
40032010 B)。
关键词
上震旦统—下寒武统
沉积特征
层序地层划分
慈利-大庸地区
湘西北
Upper Sinian-Lower Cambrian strata
depositional characteristics
sequence stratigraphic division
Cili-Dayong zone
northwestern Hunan
