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Middle-Upper Ordovician (Darriwilian-Early Katian) Positive Carbon Isotope Excursions in the Northern Tarim Basin, Northwest China: Implications for Stratigraphic Correlation and Paleoclimate
Liu Cunge1; Li Guorong1; Wang Dawei2; Liu Yongli3; Luo Mingxia3; Shao Xiaoming3
2016
Source PublicationJournal of Earth Science
Volume27Issue:2Pages:317-328
Abstract

Three positive carbon isotope excursions are reported from Middle-Upper Ordovician in Tahe oil-gas field, northern Tarim Basin. Based on conodont biostratigraphy, the Middle Darriwilian Isotope Carbon Excursion (MDICE) and the Guttenberg Carbon Isotope Excursion (GICE) are identified from Darriwilian to Early Katian by the aid of whole-rock carbon isotope data from two well cores. Positive excursion within conodont Pygodus anserinus zone is developed in Early Sandbian, and the fluctuation range is no less than MDICE. Because the range of this excursion in the generalized global carbon isotope curve is short, previous studies paid little attention to it, and named Early Sandbian Isotope Carbon Excursion (ESICE) in this paper. Furthermore, these positive excursions are not directly related to sea level fluctuations and the MDICE and GICE identified in northern Tarim can be globally correlated to that in southern China, North America, South America, and Europe. The Saergan Fm. source rocks of Middle-Upper Ordovician in Kalpin Dawangou outcrop are in accord with the geologic time of MDICE and ESICE, and GICE have strong ties to the source rock of Lianglitag Fm. in basin. Abundant organic carbon burial is an important factor in genesis of positive isotope carbon excursions. Positive oxygen isotope excursion, conodont fauna turnover, decreased conodont total diversity, and the change of sedimentary facies indicated that dramatic changes of paleoceanographic environment of Early-Middle Ordovician in Tarim Basin started from the end of Darriwillian, and an obvious icehouse climate of Late Ordovician occurred in ESICE.

KeywordTarim Basin Tahe Oil-gas Field Darriwilian Sandbian Katian Carbon Isotope Paleoclimate Source Rock
Subject Area地质学
DOI10.1007/s12583-016-0696-2
Indexed BySCI
Language英语
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/5248
Collection深海科学研究部_深海地球物理与资源研究室
Affiliation1.Chengdu University of Technology, State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu, 610059
2.Institute of DeepSea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000
3.Institute of Exploration and Development, Northwest Oilfield Company, SINOPEC, Urumqi, 830011
Recommended Citation
GB/T 7714
Liu Cunge,Li Guorong,Wang Dawei,et al. Middle-Upper Ordovician (Darriwilian-Early Katian) Positive Carbon Isotope Excursions in the Northern Tarim Basin, Northwest China: Implications for Stratigraphic Correlation and Paleoclimate[J]. Journal of Earth Science,2016,27(2):317-328.
APA Liu Cunge,Li Guorong,Wang Dawei,Liu Yongli,Luo Mingxia,&Shao Xiaoming.(2016).Middle-Upper Ordovician (Darriwilian-Early Katian) Positive Carbon Isotope Excursions in the Northern Tarim Basin, Northwest China: Implications for Stratigraphic Correlation and Paleoclimate.Journal of Earth Science,27(2),317-328.
MLA Liu Cunge,et al."Middle-Upper Ordovician (Darriwilian-Early Katian) Positive Carbon Isotope Excursions in the Northern Tarim Basin, Northwest China: Implications for Stratigraphic Correlation and Paleoclimate".Journal of Earth Science 27.2(2016):317-328.
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