气候变化领域集成服务门户(CCPortal): Timing of seawater retreat from proto-Paratethys; sedimentary provenance; and tectonic rotations in the late Eocene-early Oligocene in the Tajik Basin; Central Asia

CCPortal

DOI	10.1016/j.palaeo.2020.109657
	Timing of seawater retreat from proto-Paratethys; sedimentary provenance; and tectonic rotations in the late Eocene-early Oligocene in the Tajik Basin; Central Asia
	Sun J.; Zhang Z.; Cao M.; Windley B.F.; Tian S.; Sha J.; Abdulov S.; Gadoev M.; Oimahmadov I.
发表日期	2020
ISSN	0031-0182
卷号	545
英文摘要	The Tajik Basin is now located to the west of the Pamirs, but it formerly connected with the Tarim Basin, occupied by a large epicontinental sea (proto-Paratethys Sea) once extended from Europe to Central Asia. However, the northward indentation and collision of the Pamirs into the Tian Shan separated the Tajik and Tarim Basins, creating manifold implications and consequences. Consequently, timing of the final seawater retreat from the Tajik Basin is important for understanding the evolution of the proto-Paratethys Sea, the effect of the northward indentation of the Pamirs on the sea regression, and the influence of seawater retreat on the Cenozoic aridification in the Tajik Basin. Here we present a multidisciplinary study of Upper Paleogene strata from the central Tajik Basin. Our results demonstrate that the final seawater retreat from the center of the Tajik Basin occurred at 38.6 Ma, which is earlier than a previous age of 37.4 Ma from the northeastern Tajik Basin. Such a late Eocene sea retreat was quasi-simultaneous with that in the Tarim Basin. This final marine regression was mainly a consequence of the northward indentation and growth of the Pamirs, which was an intracontinental response to the India-Asia collision. Our new detrital zircon ages indicate that the provenance of Upper Eocene-lower Oligocene strata was from the Pamirs rather than Tian Shan, implying that the reactivation of the Tian Shan was later than the early Oligocene. Our paleomagnetic data indicate a 30° counterclockwise rotation of the central Tajik Basin that is much bigger than the previous estimate of 17°, and we propose that such a counterclockwise rotation mostly occurred after the late Miocene. Finally, different from the previous reported aridfication at 39 Ma or 37 Ma, our evidence demonstrates that drought intensified since the start of the Oligocene at 34 Ma, being related to reduced water vapor transport to Central Asia, caused by global cooling-induced sea-level drop, the retreating Paratethys Sea, and weakened sea surface evaporation. © 2020 Elsevier B.V.
英文关键词	Deformation; Land-sea change; Mountain-basin coupling; Paleoclimate; Paleogene
语种	英语
scopus关键词	aridification; Cenozoic; deformation; drought stress; Eocene; inland sea; lithostratigraphy; Oligocene; paleoclimate; Paleogene; seawater; sedimentary sequence; tectonic rotation; Central Asia; China; Europe; India; Pamirs; Tarim Basin; Tien Shan; Xinjiang Uygur
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150554
作者单位	Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Geology, University of Leicester, Leicester, LEI 7RH, United Kingdom; Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing, 210008, China; Institute of Geology, Earthquake Engineering and Seismology of the Academy of Sciences, Tajikistan
推荐引用方式 GB/T 7714	Sun J.,Zhang Z.,Cao M.,et al. Timing of seawater retreat from proto-Paratethys; sedimentary provenance; and tectonic rotations in the late Eocene-early Oligocene in the Tajik Basin; Central Asia[J],2020,545.
APA	Sun J..,Zhang Z..,Cao M..,Windley B.F..,Tian S..,...&Oimahmadov I..(2020).Timing of seawater retreat from proto-Paratethys; sedimentary provenance; and tectonic rotations in the late Eocene-early Oligocene in the Tajik Basin; Central Asia.Palaeogeography, Palaeoclimatology, Palaeoecology,545.
MLA	Sun J.,et al."Timing of seawater retreat from proto-Paratethys; sedimentary provenance; and tectonic rotations in the late Eocene-early Oligocene in the Tajik Basin; Central Asia".Palaeogeography, Palaeoclimatology, Palaeoecology 545(2020).