气候变化领域集成服务门户(CCPortal): Arctic reappraisal of global carbon-cycle dynamics across the Jurassic–Cretaceous boundary and Valanginian Weissert Event

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DOI	10.1016/j.palaeo.2020.109847
	Arctic reappraisal of global carbon-cycle dynamics across the Jurassic–Cretaceous boundary and Valanginian Weissert Event
	Jelby M.E.; Śliwińska K.K.; Koevoets M.J.; Alsen P.; Vickers M.L.; Olaussen S.; Stemmerik L.
发表日期	2020
ISSN	0031-0182
卷号	555
英文摘要	Late Jurassic – Early Cretaceous global carbon-cycle dynamics have mainly been inferred from Tethyan, Atlantic and Pacific carbon-isotope (δ13C) records. These records indicate a steady deceleration of the carbon cycle in Late Jurassic and Jurassic–Cretaceous (J–K) boundary times followed by a major mid-Valanginian carbon-cycle perturbation demarcated by the well-documented positive excursion named the Weissert Event. However, this model remains to be confirmed in Boreal records, which are rare and typically difficult to correlate with the global δ13C signal. In this study, the first continuous and biostratigraphically calibrated organic carbon-isotope (δ13Corg) stratigraphy is established for the Bathonian – lower Barremian (representing >30 Myr) of the Boreal Realm, based on high-resolution sampling of bulk-rock marine shale from four time-equivalent sections in Arctic Svalbard, supplemented by existing δ13Corg data. The δ13Corg stratigraphy displays several distinctive trends, notably: (i) a Kimmeridgian positive excursion, followed by a large negative excursion (≤6.4‰) in the upper Kimmeridgian – middle Volgian, consistent with existing Boreal δ13C records; (ii) an upper Volgian – Ryazanian overall positive recovery across the J–K boundary; and (iii) a prominent positive excursion (≤5.5‰) in the Valanginian, interpreted to represent the Weissert Event, followed by steady, high values into the lower Barremian with no apparent excursion decay. Time-calibrated correlation of the observed trends with existing δ13C records representative of the entire exchangeable carbon reservoir reflects major global carbon-cycle adjustments, including: (i) Boreal decoupling from the global carbon reservoir during Late Jurassic and J–K boundary times due to basinal isolation; and (ii) global carbon-cycle recoupling at the onset of the Weissert Event coinciding with incipient oceanographic connectivity. Boreal carbon cycling was inherently controlled by the basin configuration. The new δ13Corg stratigraphy provides a well-calibrated tool for Boreal and Boreal–Tethyan correlations, and confirms that the Weissert Event represents an important perturbation of the global carbon cycle. © 2020 Elsevier B.V.
英文关键词	Boreal–Tethyan correlation; Carbon-isotope stratigraphy; J–K boundary; Svalbard; Valanginian carbon-isotope excursion; VOICE
语种	英语
scopus关键词	Barremian; Bathonian; biostratigraphy; carbon cycle; carbon isotope; Jurassic-Cretaceous boundary; Kimmeridgian; shale; Valanginian; Arctic; Atlantic Ocean; Pacific Ocean; Svalbard; Svalbard and Jan Mayen
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/150420
作者单位	Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen K, DK-1350, Denmark; Department of Arctic Geology, The University Centre in Svalbard (UNIS), P.O. Box 156, Longyearbyen, N-9171, Norway; Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, Copenhagen K, DK-1350, Denmark; Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, Oslo, N-0318, Norway
推荐引用方式 GB/T 7714	Jelby M.E.,Śliwińska K.K.,Koevoets M.J.,等. Arctic reappraisal of global carbon-cycle dynamics across the Jurassic–Cretaceous boundary and Valanginian Weissert Event[J],2020,555.
APA	Jelby M.E..,Śliwińska K.K..,Koevoets M.J..,Alsen P..,Vickers M.L..,...&Stemmerik L..(2020).Arctic reappraisal of global carbon-cycle dynamics across the Jurassic–Cretaceous boundary and Valanginian Weissert Event.Palaeogeography, Palaeoclimatology, Palaeoecology,555.
MLA	Jelby M.E.,et al."Arctic reappraisal of global carbon-cycle dynamics across the Jurassic–Cretaceous boundary and Valanginian Weissert Event".Palaeogeography, Palaeoclimatology, Palaeoecology 555(2020).