首页|期刊导航|中国地球化学学报(英文版)|The Cenomanian-Turonian Anoxic Event in Southern Tibet: A Study of Organic Geochemistry
中国地球化学学报(英文版)2001，Vol.20Issue(4)：289-295,7.
The Cenomanian-Turonian Anoxic Event in Southern Tibet: A Study of Organic Geochemistry
The Cenomanian-Turonian Anoxic Event in Southern Tibet: A Study of Organic Geochemistry
摘要
Abstract
The Cenomanian-Turonian oceanic anoxic event (C/T OAE) is developed in south ern Tibet. Organic geochemical study of the Cenomanian-Turonian sediments from the Gamba and Tingri areas shows that the mid-Cretaceous black shales in southern Tibet are enriched in organic carbon. The molecular analyses of organic matter indicate marine organic matter was derived from algae and bacteria. In the Gamba area, the organic matter is characterized by abundant tricyclic terpanes and pregane, which are predominant in 191 and 217 mass chro matograms, respectively. Pristane/phytane (Pr/Ph) ratios in the C/T OAE sediments are less than 1, demonstrating the domination of phytane. The presence of carotane can be regarded as a special biomarker indicating oxygen depletion in the C/T OAE sediments in the Tethyan Hi malayas. In anoxic sediments, β-carotane and γ-carotane are very abundant. The β- and γ carotane ratios relative to nC17 in the Cenomanian-Turonian anoxic sediments vary from 32.28～42.87 and 5.10～11.01.关键词
Cenomanian-Turonian/oceanic anoxic event/organic geochemistry/southern Ti betKey words
Cenomanian-Turonian/oceanic anoxic event/organic geochemistry/southern Ti bet分类
天文与地球科学引用本文复制引用
胡修棉,王成善,李祥辉,范善发,彭平安..The Cenomanian-Turonian Anoxic Event in Southern Tibet: A Study of Organic Geochemistry[J].中国地球化学学报(英文版),2001,20(4):289-295,7.基金项目
This paper is supported by the National Foundation for Outstanding Young Scientists in China (No. 49625203) and by the National Laboratory of Organic Geochemistry in China (No. OGL-9709). （No. 49625203）
