Late Eocene sea retreat from the Tarim Basin (west China) and concomitant Asian paleoenvironmental change

被引:271
作者
Bosboom, Roderic E. [1 ]
Dupont-Nivet, Guillaume [1 ,2 ,3 ]
Houben, Alexander J. P. [4 ]
Brinkhuis, Henk [4 ]
Villa, Giuliana [5 ]
Mandic, Oleg [6 ]
Stoica, Marius [7 ]
Zachariasse, Willem Jan [8 ]
Guo, ZhaoJie [2 ]
Li, ChuanXin [2 ]
Krijgsman, Wout [1 ]
机构
[1] Univ Utrecht, Fac Geosci, Paleomagnet Lab Ft Hoofddijk, NL-3584 CD Utrecht, Netherlands
[2] Peking Univ, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
[3] Univ Rennes 1, UMR 6118, F-35042 Rennes, France
[4] Univ Utrecht, Fac Sci, Inst Environm Biol, Lab Palaeobot & Palynol, NL-3584 CD Utrecht, Netherlands
[5] Univ Parma, Dipartimento Sci Terra, I-43100 Parma, Italy
[6] Nat Hist Museum Vienna, Geol Palaeontol Dept, A-1010 Vienna, Austria
[7] Univ Bucharest, Fac Geol & Geophys, Dept Geol & Paleontol, Bucharest 010041, Romania
[8] Univ Utrecht, Dept Earth Sci, NL-3584 CD Utrecht, Netherlands
关键词
Tarim Basin; Paratethys; Paleoenvironment; Biostratigraphy; Eocene; OLIGOCENE DINOFLAGELLATE CYSTS; NORTHERN TIBETAN PLATEAU; NORTHEASTERN TIBET; TIAN-SHAN; CLIMATE; TRANSITION; UPLIFT; EVOLUTION; MONSOON; RECORDS;
D O I
10.1016/j.palaeo.2010.11.019
中图分类号
P9 [自然地理学];
学科分类号
070501 [自然地理学];
摘要
The Paleogene sediments of the southwest Tarim Basin along the West Kunlun Shan in western China include the remnants of the easternmost extent of a large epicontinental sea. This shallow sea once extended across the Eurasian continent before it retreated westward and eventually separated as the Paratethys Sea. Climate modeling results suggest that this sea retreat is an equally important forcing mechanism as the Tibetan plateau uplift in the aridification of the Asian continental interior and the intensification of the Asian monsoon system. The age and paleogeography of the retreat are poorly constrained, hindering the understanding of its cause and paleoenvironmental impacts. This study reports litho- and biostratigraphic results from two sections recording the last major regression out of the Tarim Basin that is expressed by a regional transition from marine clastics and limestones to continental red-beds. Rich micro- and macrofossil assemblages, including benthic foraminifera, ostracods, bivalves, calcareous nannofossils and organic walled dinoflagellate cysts (dinocysts), indicate a shallow, proximal and marine environment. Strong similarity to assemblages known from Central Asia and Europe confirms that surface-ocean connections extended across Eurasia from the Tarim Basin to the western Tethys during the latest Eocene. Moreover, the recovered fossil associations date the last marine sediments as earliest Priabonian in age (similar to 37 Ma: overlap between dinoflagellate Mps Interval Zone and calcareous nannofossil Zone CP 14). The retreat of the sea from the Tarim Basin is time-equivalent with the sea level lowstand at the Bartonian-Priabonian boundary but pre-dates both the Oligocene-Miocene regional uplift of the Pamir mountains and Kunlun Shan and the major eustatic sea-level falls of the Eocene-Oligocene Transition (similar to 34 Ma) and mid-Oligocene (similar to 30 Ma), which are usually held responsible for the sea retreat. Furthermore, a concomitant and significant aridification step occurs at similar to 36.6 Ma (top of chron C17n.1n) as recorded by regional sedimentary records of the Xining Basin along the northeastern Tibetan Plateau, suggesting that the Tarim Sea served as a significant moisture contributor for the Asian interior. (c) 2010 Elsevier B.V. All rights reserved.
引用
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页码:385 / 398
页数:14
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