Earliest Cretaceous (late Berriasian) glendonites from Northeast Siberia revise the timing of initiation of transient Early Cretaceous cooling in the high latitudes |
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| Institution: | 1. Geological Institute of RAS, Pyzhevski Lane 7, Moscow, 119017, Russia;2. Institute of Earth Science, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia;1. Czech Geological Survey, Klárov 131/3, 118 21 Praha, Czech Republic;2. Czech Geological Survey, Brno Branch, Leitnerova 22, 602 00 Brno, Czech Republic;1. Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100101, China;2. Key Laboratory of Continental Collision and Plateau Uplift, Chinese Academy of Sciences, Beijing 100101, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, CAS, Beijing 100101, China;5. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;6. Department of Earth and Atmospheric Sciences, City College of New York, CUNY, New York, NY 10031, United States;1. Department of Orthopaedic Surgery, Second Affiliated Hospital of Wenzhou Medical University, 109 Xueyuan Xi Road, Wenzhou, Zhejiang, 325027, China;2. Endocrine & Metabolic Diseases Unit, Affiliated Hospital of Guizhou Medical University, Guizhou, 550001, China;3. Department of Orthopaedic Surgery, Wenzhou Central Hospital, Wenzhou, Zhejiang, 325000, China;4. Sichuan Provincial Orthopedics Hospital, NO. 132 West First Section First Ring Road, Chengdu, Sichuan, 610000, China;1. Université de Toulouse; UPS-OMP; IRAP, Toulouse, France;2. CNRS; IRAP, 9 Av. colonel Roche, BP 44346, F-31028 Toulouse cedex 4, France;3. Aix-Marseille Université, CNRS, IRD, CEREGE UM34, Aix-en-Provence, France;4. Université de Nantes, Laboratoire de Planétologie et Géodynamique, CNRS UMR 6112, Nantes, France;5. Univ. Paris-Sud, GEOPS-CNRS, UMR8148, Orsay, France |
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| Abstract: | The studies of past climatic changes form the basis for predicting our future anthropogenic world and are among the most prominent topics in current Earth sciences. Although the Cretaceous is generally considered as a greenhouse period in Earth's history, a number of significant cooling events based on an array of climatic proxies have been identified. Here we present the first data on Berriasian (Ryazanian) glendonite findings from the paleontologically well dated Lower Cretaceous succession of northeastern Siberia. Based on well calibrated Buchia and ammonite biostratigraphy, the stratigraphic interval across which the glendonites occur is restricted to the late Berriasian. Stable carbon isotope (δ13C) values of the studied glendonites clearly suggest the precipitation of ikaite from marine water without any significant contamination from biogenic methane. Our results, when integrated with other available paleoclimatic proxies from elsewhere in the high latitudes, suggest a revision of the initiation of Early Cretaceous cooling in the high latitudes from the Valanginian to the late Berriasian. All known occurrences of Lower Cretaceous glendonites in both the northern and southern hemispheres are reviewed. |
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| Keywords: | Glendonites Berriasian Ryazanian Cooling Methane Stable isotopes |
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