| The Cenomanian—Turonian Anoxic Event in Southern Tibet：A Study of Organic Geochemistry |
| |
| 引用本文： | 胡修棉,胡成善,等.The Cenomanian—Turonian Anoxic Event in Southern Tibet：A Study of Organic Geochemistry[J].中国地球化学学报,2001,20(4):289-295. |
| |
| 作者姓名： | 胡修棉 胡成善 |
| |
| 作者单位： | [1]InstituteofSedimentaryGeology,ChengduUniversityofTechnology,Chengdu610059,China [2]InstituteofSedimentar,ChengduUniversityofTechnology,Chengdu610059,China |
| |
| 摘 要： | The Cenomanian-Turonian oceanic anoxic event(C/T OAE) is developed in southern Tibet.Organic geochemical study of the Cenomanian-Turonian sediments from the Gamba and Tingri aress shows that the mid-Cretaceous black shales in southern Tibet are enriched in organic carbon.Te 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 chromatograms,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 Himalayas.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 32.28-42.87and 5.10-11.01.
|
| 关 键 词： | 海洋缺氧事件 有机地球化学 西藏 OAE |
| 收稿时间： | 6 September 2004 |
The Cenomanian-Turonian anoxic event in southern Tibet: A study of organic geochemistry |
| |
| Xiumian Hu,Chengshan Wang,Xianghui Li,Shanfa Fan,Ping’an Peng.The Cenomanian-Turonian anoxic event in southern Tibet: A study of organic geochemistry[J].Chinese Journal of Geochemistry,2001,20(4):289-295. |
| |
| Authors: | Xiumian Hu Chengshan Wang Xianghui Li Shanfa Fan Ping’an Peng |
| |
| Institution: | (1) Department of Geology and Geoenvironment, National University of Athens, Panepistimiopolis, 157 84 Attiki, Greece;(2) Department of Geology, Rhodes University, Grahamstown, 6140, South Africa;(3) Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK;(4) Department of Marine Biogeochemistry and Toxicology, Royal Netherlands Institute of Sea Research (NIOZ), 1790 AB Den Burg, Texel, The Netherlands;(5) Museum of Natural History, Municipality of Amaroussion, 15122 Attiki, Greece |
| |
| Abstract: | The Cenomanian-Turonian oceanic anoxic event (C/T OAE) is developed in southern 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 chromatograms, 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 Himalayas. 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. |
| |
| Keywords: | |
| 本文献已被 维普 SpringerLink 等数据库收录！ |
|
