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

作　　者：WANG Xin Brian KRAATZ Jin MENG Barbara CARRAPA Peter DECELLES Mark CLEMENTZ Sherzod ABDULOV CHEN FaHu 

机构地区：[1]Key Laboratory of Western China's Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences Lanzhou University,Lanzhou 730000,China [2]Western University of Health Sciences,Pomona 91766,USA [3]American Museum of Natural History,New York 10024,USA [4]Department of Geosciences,University of Arizona,Tucson 85721,USA [5]Department of Geology and Geophysics,University of Wyoming,Laramie 82071,USA [6]Institute of Geology,Earthquake Engineering and Seismology of the Academy of Sciences,Tajikistan [7]CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100101,China

出　　处：《Science China Earth Sciences》2016年第6期1242-1257,共16页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41302144&41130102);the Programme of Introducing Talents of Discipline to Universities(111 Project)(Grant No.B06026);the Open Foundation of MOE Key Laboratory of Western China’s Environmental System,Lanzhou University(Grant No.LZUJBKY-2013-BT01)

摘　　要：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.The tempo-spatial development of the Cenozoic Asian aridification across the Eocene-Oligocene and its control- ling 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 

分 类 号：P588.2[天文地球—岩石学] P534.6[天文地球—地质学]