西藏特提斯喜马拉雅白垩纪中期Cenomanian-Turonian期碳同位素偏移

李祥辉; 王成善; HughC. Jenkyns; 成鑫荣; 崔杰; 胡修棉

Volume 30 Issue 3

May 2005

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Article Navigation > Earth Science > 2005 > 30(3): 317-327

LI Xiang-hui, WANG Cheng-shan, Hugh C. Jenkyns, CHENG Xin-rong, CUI Jie, HU Xiu-mian, 2005. Bulk Carbon Isotope Excursions of the Cenomanian through Turonian of Mid-Cretaceous in Southern Tibet. Earth Science, 30(3): 317-327.

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Bulk Carbon Isotope Excursions of the Cenomanian through Turonian of Mid-Cretaceous in Southern Tibet

1.
State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
2.
School of the Earth Sciences and Resources, China Univcersity of Geosciences, Beijing 100083, China
3.
Department of Earth Sciences, University of Oxford, Oxford, UK
4.
Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
5.
Department of Earth Sciences, Nanjing University, Nanjing 210093, China

Received Date: 2004-11-24
Publish Date: 2005-05-25

Abstract

Abstract

In the past, huge high-resolution data of carbon and oxygen isotopic values on paleoceanography of the Cenomanian-Turonian and on anoxic event of its boundary passage were derived from DSDP, ODP and deeper basins in Euramerica, but few and rough data relevant came from southern Tibet, China. The new carbon isotope high-resolution data of the Cenomanian-Turonian in this paper aim to provide a correlation among Euramerica, DSDP, ODP and southeastern Tethys Ocean (southern Tibet), and try to characterize the carbon isotopic curve in shallower lithofacies background. Carbon isotopic values obtained from the Gongzha Section of Tingri and the Zongshan Section of Gamba, in southern Tibet, indicate a long-term tendency of Cenomanian through Turonian similar to those from Tethys even globe. The carbon isotopic values seldom change in the middle-late Cenomanian. An abrupt and high-amplitude positive excursion occurs near the passage bed of Cenomanian and Turonian, then goes negative in gradual in whole Turonian. At the same time, two negative excursion troughs are recognized at both the middle H. helvetica zone and the boundary of the H. helvetica and M. sigali zones by a moderate positive area between, which is the same as in Europe and ODP in time and pace and is in harmony with the global carbon cycle and climate changes. However, the much alterable excursions and paces of the δ¹³C value at Gamba are different from those at Tingri and other locations in the world. The former difference may be the result of diagenetic overprint, and the latter may be mistaken biozone positions. According to the potential correlation tool of carbon isotopes, it is suggested that the horizon of the Cenomanian-Turonian boundary may need to be promoted upward ca. 40 m. Lack of typical organic black shale at the Cenomanian-Turonian boundary in shallow sea area including southern and northern Tibetan Tethys Himalayas indicates the high δ¹³C values in the oceanic sediments are not the unique result of the oceanic anoxic event but a mixed response of global carbon reservoir.
- carbon isotope,
- Cenomanian,
- Turonian,
- Cretaceous,
- Tethys Himalayas,
- Tibet

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References(44)

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