A Simple Analysis of Influential Factors for Cretaceous Marine Organic-Rich Sediments in Southern Tibet

• 责任者：Wang Licheng (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Chengshan
• 刊名：Earth Science Frontiers
• 出版年：2009
• 卷期：16(5)
• 关键词：沉积速率 ; sedimentation rates ; 古生产力 ; paleoproductivity ; 西藏 ; Tibet
• 页码：p.107-117
• 图表：4 illus., 3 tables, 53 refs.
• 分类号：0803
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

A marine Cretaceous organic-rich sequence deposited extensively in Southern Tibet, and the black shale therein correlated with Cenomanian-Turonian Anoxic Events has been receiving extensive interest. However, the TOC content is much lower than the black shale in West Tethys. Therefore, understanding the dominated mechanism of the organic-rich sediments is important to the problem. The authors selected 4 cross sections in Southern Tibet, which have been studied more intensively by the predecessors, namely, the Gamba ZongshanⅡ, the Tingri Gongzha, the Gyangze Jiabula and the Chuangde, to calculate the sedimentation rate, accumulation rate and paleoproductivity by using related data. The result showed that the highest sedimentation rate occurred at Cenomanian-Turonian, and the Gamba, Tingri and Gyangze areas had different sedimentation rate owing to their different deposited environments.