The shutdown of an anoxic giant: Magnetostratigraphic dating of the end of the Maikop Sea

doi:10.1016/j.gr.2018.09.011

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	The shutdown of an anoxic giant: Magnetostratigraphic dating of the end of the Maikop Sea
	Palcu, D. V.1; Popov, S. V.2; Golovina, L. A.3; Kuiper, K. F.4; Liu, S.1,5; Krijgsman, W.1
刊名	GONDWANA RESEARCH
	2019-03-01
卷号	67 页码:82-100
关键词	Anoxia Paratethys Maikop Middle Miocene Biostratigraphy Magnetostratigraphy Marine flooding Paleogeography Tarkhanian Chokrakian Karaganian Marine gateways Tectonic-eustatic interplay
ISSN号	1342-937X
DOI	10.1016/j.gr.2018.09.011
英文摘要	Paratethys, the lost sea of central Eurasia. was an anoxic giant during Oligocene - early Miocene (Maikop Series) times. With a size matching the modern-day Mediterranean Sea and a history of anoxic conditions that lasted for over 20 Myrs, the eastern part of this realm (Black Sea-Caspian Sea domain) holds key records for understanding the build-up, maintenance and collapse of anoxia in marginal seas. Here, we show that the collapse of anoxic Maikop conditions was caused by middle Miocene paleogeographic changes in the Paratethys gateway configuration, when a mid-Langhian (Badenian-Tarkhanian) transgression flooded and oxygenated the Eastern Paratethys. We present an integrated magneto-biostratigraphic framework for the early Middle Miocene (Tarkhanian-Chokrakian-Karaganian regional stages) of the Eastern Paratethys and date the lithological transition from anoxic black shales of the Maikop Series to fossiliferous marine marls and limestones of the regional Tarkhanian stage. For this purpose, we selected two long and time-equivalent sedimentary successions, exposed along the Belaya and the Pshekha rivers, in the Maikop type area in Ciscaucasia (southern Russia). We show that a significant but short marine incursion took place during the Tarkhanian, ending the long-lasting Maikop anoxia of the basin. Our magnetostratigraphic results reveal coherent polarity patterns, which allow a straightforward correlation with the time interval 15-12 Ma of the Geomagnetic Polarity Time Scale. The Tarkhanian flooding occurred during a relatively short normal polarity interval that correlates with C5Bn, resulting in an age of 14.85 Ma. The regional Tarkhanian/Chokrakian stage boundary is located within CSADn at an age of 14.75 Ma and the Chokrakian/Karaganian boundary is tentatively correlated with C5ACn and an age of 13.9-13.8 Ma. Our new Tarkhanian flooding age reveals a paleogeographic scenario that is different from many previous reconstructions. Instead of envisaging marine connections to the Indian Ocean, we show that major changes in connectivity between the Eastern and Central Paratethys seas have caused the influx of marine waters during the Tarkhanian. An increase in marine connectivity with the Mediterranean during a short episode of rapid sea-level rise triggered mixing and ended the widespread anoxia in the Eastern Paratethys. The mixing episode was short-lived (similar to 100 kyr) as the sea-level rise slowed down and connectivity degraded because of tectonic uplift in the gateway area. (C) 2018 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
资助项目	Geological Institute RAS[AAAA-A17-117030610119-6] ; Russian Foundation for Basic Research[17-05-00047] ; Russian Foundation for Basic Research[16-05-01032] ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant
WOS关键词	CENTRAL PARATETHYS STRATIGRAPHY ; MIDDLE MIOCENE ; MAGNETIC-PROPERTIES ; BASIN ; CONSTRAINTS ; EVOLUTION ; OLIGOCENE ; STAGE ; AGE ; GREIGITE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000468247100006
资助机构	Geological Institute RAS ; Geological Institute RAS ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant ; Geological Institute RAS ; Geological Institute RAS ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant ; Geological Institute RAS ; Geological Institute RAS ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant ; Geological Institute RAS ; Geological Institute RAS ; Russian Foundation for Basic Research ; Russian Foundation for Basic Research ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant ; Netherlands Geosciences Foundation from the Netherlands Organization for Scientific Research (NWO) through the VICI grant
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92115]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Palcu, D. V.
作者单位	1.Univ Utrecht, Paleomagnet Lab Ft Hoofddijk, Budapestlaan 17, NL-3584 CD Utrecht, Netherlands 2.Russian Acad Sci, Borissiak Paleontol Inst, Profsoyuznaya Ul 123, Moscow 117997, Russia 3.Russian Acad Sci, Inst Geol, Pyzhevskiy Per 7, Moscow 119017, Russia 4.Vrije Univ, Dept Sci, NL-1081 HV Amsterdam, Netherlands 5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Palcu, D. V.,Popov, S. V.,Golovina, L. A.,et al. The shutdown of an anoxic giant: Magnetostratigraphic dating of the end of the Maikop Sea[J]. GONDWANA RESEARCH,2019,67:82-100.
APA	Palcu, D. V.,Popov, S. V.,Golovina, L. A.,Kuiper, K. F.,Liu, S.,&Krijgsman, W..(2019).The shutdown of an anoxic giant: Magnetostratigraphic dating of the end of the Maikop Sea.GONDWANA RESEARCH,67,82-100.
MLA	Palcu, D. V.,et al."The shutdown of an anoxic giant: Magnetostratigraphic dating of the end of the Maikop Sea".GONDWANA RESEARCH 67(2019):82-100.