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Geosciences 2018, 8(9), 330;

Oxygen and Carbon Stable Isotope Composition of Cretaceous to Pliocene Calcareous Paleosols in the Tian Shan Region (Central Asia): Controlling Factors and Paleogeographic Implications

Géosciences Rennes, Université de Rennes, CNRS, UMR 6118, F-35000 Rennes, France
Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005 Paris, France
CASP, West Building, Madingley Rise, Madingley Road, Cambridge CB3 0UD, UK
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Research Station of the Russian Academy of Sciences, Bishkek 720049, Kyrgyzstan
Author to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 28 August 2018 / Accepted: 29 August 2018 / Published: 3 September 2018
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The Late Mesozoic–Cenozoic topographic and climate evolution of Central Asia remains highly debated. The final retreat of the proto-Paratethys Sea from the western Tarim Basin is thought to correspond in time with the onset of tectonic uplift in the Pamir, Tian Shan and Altai ranges, as well as with regional aridification. The oxygen and carbon isotope compositions of the sediment deposits in the various Central Asian basins have already been used to decipher both the topographic and climatic changes that occurred in that region during the Cenozoic, generally concentrating on one sedimentary section and/or on a limited time range and either using multiple-type samples including sandstone calcitic cements, marine carbonates, fossils, or paleosols. In order to get a homogeneous dataset, minimizing variations in the isotopic composition of the material depending on its type and/or depositional environment, we selected only calcareous paleosols sampled in several continuous sections covering a wide time range from the Late Jurassic to the Pliocene. Our sampling also covers a wide area encompassing the whole Tian Shan region, which allows detecting regional variations in the δ18O and δ13C values. We show that the influence of the distance to the proto-Paratethys Sea on the paleosol δ18O record was not significant. Besides local factors such as the occurrence of large lakes that can have a significant effect on the isotopic composition of the calcareous paleosols, the long-term evolution of both the δ18O and δ13C values possibly reflects the hypsometry of the river drainage systems that bring water to the basins. However, as it is commonly accepted that the δ18O of soil carbonates is controlled by the δ18O of in-situ precipitation, this last conclusion remains to be further investigated. View Full-Text
Keywords: Central Asia; late Mesozoic–Cenozoic climate; hypsometry; calcareous paleosols Central Asia; late Mesozoic–Cenozoic climate; hypsometry; calcareous paleosols

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Jolivet, M.; Boulvais, P.; Barrier, L.; Robin, C.; Heilbronn, G.; Ledoyen, J.; Ventroux, Q.; Jia, Y.; Guo, Z.; Bataleva, E.A. Oxygen and Carbon Stable Isotope Composition of Cretaceous to Pliocene Calcareous Paleosols in the Tian Shan Region (Central Asia): Controlling Factors and Paleogeographic Implications. Geosciences 2018, 8, 330.

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