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Central Asian aridification during the late Eocene to early Miocene inferred from preliminary study of shallow marine-eolian sedimentary rocks from northeastern tajik basin

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Science China Earth Sciences 2016年第6期59卷 1242-1257页

作者： WANG Xin Brian KRAATZ Jin MENG Barbara CARRAPA Peter DECELLES Mark CLEMENTZ Sherzod ABDULOV CHEN FaHu Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China Western University of Health Sciences Pomona 91766USA American Museum of Natural History New York 10024USA Department of Geosciences University of ArizonaTucson 85721USA Department of Geology and Geophysics University of WyomingLaramie 82071USA Institute of Geology Earthquake Engineering and Seismology of the Academy of SciencesTajikistan CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China

The tempo-spatial development of the Cenozoic Asian aridification across the Eocene-Oligocene and its controlling factors are important scientific topics in Earth Sciences, which are pertinent to regional and global tectonic and climatic events. However, sedimentary rocks preserving the record of aridification during this time from central Asia(ACA) are rare. Here we present a preliminary analysis of sedimentary facies of the lower Paleogene in the northeastern tajik basin, which reveals that: the lower part of the studied section is dominated by shallow marine deposits of the Paratethys, the middle part is typical of alternations of eolian dune and fluvial deposits, the upper part is represented by eolian loess-sandy loess(L&SL) like facies, and the top exhibits alternations of fluvial-lacustrine and loess like facies. Based on a chronological framework derived from preliminary magnetostratigraphy, published U-Pb dating of a volcanic ash, and regional litho-stratigraphic correlations, we determine that eolian and L&SL facies accumulated in the northeastern tajik basin during the Late Eocene and through most of the Oligocene. These sedimentary units indicate that semi-arid to arid environments of ACA had developed at least since the late Eocene. This initial aridification is closely linked to the westward retreat of the Paratethys that was likely driven by a combination of tectonic activity and sea level changes.

关键词： northeastern tajik basin Paleogene Eolian deposits Paratethys Aridification

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