globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.03.035
论文题名:
Timing, cause and impact of the late Eocene stepwise sea retreat from the Tarim Basin (west China)
作者: Bosboom R.; Dupont-Nivet G.; Grothe A.; Brinkhuis H.; Villa G.; Mandic O.; Stoica M.; Kouwenhoven T.; Huang W.; Yang W.; Guo Z.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 403
起始页码: 101
结束页码: 118
语种: 英语
英文关键词: Asia ; Biostratigraphy ; Eocene ; Palaeogeography ; Paratethys Sea ; Tarim Basin
英文摘要: A vast shallow epicontinental sea extended across Eurasia and was well-connected to the Western Tethys before it retreated westward and became isolated as the Paratethys Sea. However, the palaeogeography and the timing of this westward retreat are too poorly constrained to determine potential wider environmental impacts, let alone understanding underlying mechanisms of the retreat such as global eustasy and tectonism associated with the Indo-Asia collision. Here, an improved chronostratigraphic and palaeogeographic framework is provided for the onset of the proto-Paratethys Sea retreat at its easternmost extent in the Tarim Basin in western China is provided. Five different third-order sea-level cycles can be recognised from the Cretaceous-Palaeogene sedimentary record in the Tarim Basin, of which the last two stepped successively westwards as the sea retreated after the maximum third incursion. New biostratigraphic data from the fourth and fifth incursions at the westernmost margin of the Tarim Basin are compared to our recent integrated bio-magneto-stratigraphic results on the fourth incursion near the palaeodepocentre in the south-western part of the basin. While the fourth incursion extended throughout the basin and retreated at ~. 41. Ma (base C18r), the last and fifth incursion is restricted to the westernmost margin and its marine deposits are assigned a latest Bartonian-early Priabonian age from ~. 38.0 to ~. 36.7. Ma (near top C17n.2n to base C16n.2n). Similar to the fourth, the fossil assemblages of the fifth incursion are indicative of shallow marine, near-shore conditions and their widespread distribution across Eurasia suggests that the marine connection to the Western Tethys was maintained. The lack of diachronicity of the fourth incursion between the studied sections across the southwest Tarim Basin suggests that the sea entered and withdrew relatively rapidly, as can be expected in the case of eustatic control on a shallow epicontinental basin. However, the westward palaeogeographic step between the fourth and fifth incursions separated by several millions of years rather suggests the combined long-term effect of tectonism, possibly associated with early uplift of the Pamir-Kunlun Shan thrust belt. The fourth and fifth regressions are time-equivalent with significant aridification steps recorded in the Asian interior, thus supporting climate modelling results showing that the stepwise sea retreat from Central Asia amplified the aridification of the Asian interior. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69352
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作者单位: Paleomagnetic Laboratory Fort Hoofddijk, Faculty of Geosciences, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, Netherlands; Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education (Peking University), Beijing 100871, China; Géosciences Rennes, UMR 6118, Université de Rennes1, Campus de Beaulieu, 35042 Rennes Cedex, France; Marine Palynology and Palaeoceanography, Laboratory of Palaeobotany and Palynology, Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, Netherlands; Dipartimento di Fisica e Scienze della Terra, University of Parma, Viale Usberti, 157A, 43100 Parma, Italy; Geological-Palaeontological Department, Natural History Museum Vienna, Burgring 7, A-1010 Wien, Austria; Department of Geology and Paleontology, Faculty of Geology and Geophysics, Bucharest University, Bǎlcescu Bd. 1, 010041, Romania

Recommended Citation:
Bosboom R.,Dupont-Nivet G.,Grothe A.,et al. Timing, cause and impact of the late Eocene stepwise sea retreat from the Tarim Basin (west China)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,403
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