干旱区生态环境知识资源中心(Arid): Late Cretaceous changes in oceanic currents and sediment sources in the eastern Tethys: insights from Nd isotopes and clay mineralogy

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DOI	10.1016/j.gloplacha.2020.103353
	Late Cretaceous changes in oceanic currents and sediment sources in the eastern Tethys: insights from Nd isotopes and clay mineralogy
	Chenot, Elise; Puceat, Emmanuelle; Freslon, Nicolas; Deconinck, Jean-Francois; Razmjooei, Mohammad Javad; Thibault, Nicolas
通讯作者	Chenot, E (corresponding author)，Inst Polytech Lasalle Beauvais, 19 Rue Pierre Waguet,BP 30313, F-60026 Beauvais, France. ; Chenot, E (corresponding author)，Univ Bourgogne Franche Comte, Biogeosci, UMR 6282, 6 Blvd Gabriel, F-21000 Dijon, France.
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2021
卷号	198
英文摘要	The Late Cretaceous is marked by geodynamical changes including Africa-Eurasia convergence that resulted in the narrowing of the Tethys Ocean and in ophiolite obduction along the southern margin of the various continental blocks in eastern Tethys. Geochemical and mineralogical analyses were performed on the Shahneshin section (Zagros Basin - eastern Tethys), to explore the consequences of this evolution on oceanic circulation, and to estimate the role of ophiolite weathering that can impact climate through atmospheric CO2 drawdown. [Ni] and [Cr] sharply increase in the uppermost Campanian - Maastrichtian interval and are not coeval with an increase in the Nd isotope composition (eNd) of the detrital fraction of the sediments. This is interpreted as reflecting weathering of the mantellic, ultramafic part of the ophiolite sequence at that time, implying that ophiolites were exposed on the continents as soon as the Coniacian in the vicinity of the Zagros Basin. Hence their weathering could have contributed to the Late Cretaceous climatic cooling. Clay mineralogy reveals an alternation of kaolinite-rich humid periods (Coniacian/Santonian and late early Campanian to latest Campanian) and kaolinite-depleted arid periods (early Campanian and the latest Campanian to late Maastrichtian). The eNd(t) of bathyal waters (carbonate leached fraction) appears quite radiogenic, in the range of -3.4 to -5.2 e-units, about 2 to 4 e-units higher than the detrital fraction. Changes in the eNd(t) of detrital material delivered to the Zagros Basin appear to control the eNd(t) of the local bottom waters from the Coniacian to the middle Campanian. By contrast, decoupling of detrital eNd(t) from that of the local bottom waters from the middle Campanian to the Maastrichtian points to increasing fluxes of westward flowing Pacific radiogenic water masses into the eastern Tethys at that time. These results support an intensification of the Tethyan Circumglobal Current, likely related to the narrowing of the Tethyan seaway.
英文关键词	Ocean circulation Late Cretaceous Continental weathering Climate Shahneshin section Iran
类型	Article
语种	英语
开放获取类型	Bronze, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000756770000001
WOS关键词	RARE-EARTH-ELEMENTS ; ZAGROS SUTURE ZONE ; SEA-LEVEL CHANGES ; U-PB GEOCHRONOLOGY ; TECTONIC EVOLUTION ; DEPOSITIONAL ENVIRONMENT ; SURFACE-TEMPERATURE ; SOUTHERN TETHYS ; PACIFIC-OCEAN ; ICP-MS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/375976
作者单位	[Chenot, Elise] Inst Polytech Lasalle Beauvais, 19 Rue Pierre Waguet,BP 30313, F-60026 Beauvais, France; [Chenot, Elise; Puceat, Emmanuelle; Freslon, Nicolas; Deconinck, Jean-Francois] Univ Bourgogne Franche Comte, Biogeosci, UMR 6282, 6 Blvd Gabriel, F-21000 Dijon, France; [Razmjooei, Mohammad Javad] Shahid Beheshti Univ, Fac Earth Sci, Dept Geol, Tehran, Iran; [Razmjooei, Mohammad Javad; Thibault, Nicolas] Univ Copenhagen, IGN, Oster Voldgade 10, DK-1350 Copenhagen, Denmark
推荐引用方式 GB/T 7714	Chenot, Elise,Puceat, Emmanuelle,Freslon, Nicolas,et al. Late Cretaceous changes in oceanic currents and sediment sources in the eastern Tethys: insights from Nd isotopes and clay mineralogy[J],2021,198.
APA	Chenot, Elise,Puceat, Emmanuelle,Freslon, Nicolas,Deconinck, Jean-Francois,Razmjooei, Mohammad Javad,&Thibault, Nicolas.(2021).Late Cretaceous changes in oceanic currents and sediment sources in the eastern Tethys: insights from Nd isotopes and clay mineralogy.GLOBAL AND PLANETARY CHANGE,198.
MLA	Chenot, Elise,et al."Late Cretaceous changes in oceanic currents and sediment sources in the eastern Tethys: insights from Nd isotopes and clay mineralogy".GLOBAL AND PLANETARY CHANGE 198(2021).