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Journal of the Geological Society; 2006; v. 163; issue.2; p. 375-382;
DOI: 10.1144/0016-764905-046
© 2006 Geological Society of London

Original Article

Upper Cretaceous carbon- and oxygen-isotope stratigraphy of hemipelagic carbonate facies from southern Tibet, China

Xianghui Li1, Hugh C. Jenkyns2, Chengshan Wang3, Xiumian Hu4, Xi Chen1, Yushuai Wei1, Yongjian Huang1 & Jie Cui1

1 1State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, P.R. China (e-mail: lixh@cdut.edu.cn)
2 2Department of Earth Sciences, University of Oxford, Oxford OX1 3PR, UK
3 3China University of Geosciences, Beijing, P.R. China
4 4Department of Earth Sciences, Nanjing University, Nanjing, P.R. China

A high-resolution carbon-isotope curve derived from Upper Cretaceous hemipelagic sediments cropping out at Tingri, southern Tibet, shows similarities to patterns established on other continents, notably in the presence of a well-defined positive excursion across the Cenomanian–Turonian boundary where {delta}13C values exceed 3.5{per thousand}. From the upper Turonian to the lower Campanian, {delta}13C values generally decline, apart from a minor positive excursion in the middle Coniacian: a trend that departs from that recorded from Europe. Relatively low {delta}13C values (c. 1{per thousand}) at the Santonian–Campanian and Campanian–Maastrichtian boundaries in Tibet define a prominent broad positive excursion centred in the middle Campanian and terminated by an abrupt fall towards the close of the stage. When compared with data from Europe and North Africa, the {delta}13C values of the Tibetan section are generally lower by c. 1.5{per thousand}, except for the middle Campanian positive excursion where values ({delta}13C c. 2{per thousand}) are comparable with those documented from Europe and North Africa. These differences are interpreted as reflecting variable mixing of water masses carrying different carbon-isotope signatures, such that areas close to the major sinks of marine organic carbon recorded higher {delta}13C values than those located in more distal regions. Oxygen-isotope ratios, albeit affected by diagenesis, may record a palaeotemperature signal.




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I. JARVIS, A. S. GALE, H. C. JENKYNS, and M. A. PEARCE
Secular variation in Late Cretaceous carbon isotopes: a new {delta}13C carbonate reference curve for the Cenomanian-Campanian (99.6-70.6 Ma)
Geological Magazine, 2006; 143: 561 - 608.
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