Carbon Isotopic and Element Geochemical Responses of Carbonate Rocks and Ordovician Sequence Stratigraphy in Keping Area, Tarim Basin
详细信息
- 责任者：Hu Mingyi (Faculty of Earth Science ; Yangtze University ; Jingzhou 434023 ; China) ; Qian Yong
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2010
- 卷期：29(2)
- 关键词：奥陶纪 ; Ordovician ; 层序地层学 ; sequence stratigraphy ; 塔里木盆地 ; Tarim Basin
- 页码：p.199-205
- 图表：4 illus., 15 refs.
- 分类号：1200
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
摘要
The Ordovician strata in Keping area of Tarim Basin are dominated by a series of stable carbonate and clastic rocks and can be divided into shallow platform and deep water depositional systems and then subdivided into four different facies types, namely, restricted platform, open platform, neritic shelf and basin. Based on detailed outcrop geological research, the authors found two different kinds of sequence boundaries. The authors divided the Ordovician strata into 9 third-grade sequences according to an analysis of the sequence stratigraphic framework. C isotopic and element geochemical compositions of those sequences suggest that δ13C values and element geochemical compositions show obvious differences and regular variations in different sequence boundaries and different sequence system tracts. It is suggested that the rise and fall of sea-level occurred many times. In the study area, element geochemical features and sedimentary sequences have a good response relationship.