气候变化领域集成服务门户(CCPortal): Climatic fluctuations and seasonality during the Kimmeridgian (Late Jurassic): Stable isotope and clay mineralogical data from the Lower Saxony Basin; Northern Germany

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DOI	10.1016/j.palaeo.2018.12.018
	Climatic fluctuations and seasonality during the Kimmeridgian (Late Jurassic): Stable isotope and clay mineralogical data from the Lower Saxony Basin; Northern Germany
	Zuo F.; Heimhofer U.; Huck S.; Adatte T.; Erbacher J.; Bodin S.
发表日期	2019
ISSN	0031-0182
起始页码	1
结束页码	15
卷号	517
英文摘要	In previous palaeoclimatic models, the Kimmeridgian stage has been defined as a typical greenhouse-time interval with weak latitudinal gradients. However, palaeoclimatic information based on biogenic low-Mg calcite δ18O for the Kimmeridgian is still limited. Here, shell materials (n = 81) precipitated by brachiopods, oysters and Trichites bivalves from the Lower Saxony Basin, Northern Germany are evaluated for their potential to act as archive for marine sea-surface temperatures. Furthermore, the associated clay mineral assemblages based on bulk materials are used to infer hinterland weathering patterns and overall climatic conditions simultaneously. The established sea-surface temperature curve reveals an overall slightly warming trend through the Kimmeridgian. Weak seasonality (~4 °C) in sea-surface temperatures is documented by oxygen isotope variations measured along the growth lines of a large Trichites shell. Distinctly higher δ18O values observed in the Lower Kimmeridgian (late Baylei Chron) are interpreted to be related to the short-term influx of cooler boreal water masses. Judging from the corresponding smectite-dominated interval, however, the positive oxygen isotope anomaly may also be partly explained by a relatively drier climate causing enhanced δ18Oseawater values due to intensified evaporation. The kaolinite/(illite + chlorite) ratio points to a slightly long-term decrease in humidity through the Kimmeridgian on the landmasses surrounding the LSB. The short-term fluctuations in humid/arid conditions correlate significantly with sea-level changes, with humid climates accompanying high sea-levels and arid climates accompanying low sea-levels. Results from this study provide new insights into Late Jurassic climatic dynamics and help to establish a reliable Subboreal Late Jurassic sea-surface temperature curve. © 2018 Elsevier B.V.
英文关键词	Clay mineralogy; Palaeoclimate; Sea-surface temperature; Shell-calcite oxygen-isotope
语种	英语
scopus关键词	anomaly; assembly rule; bivalve; calcite; clay mineral; climate conditions; isotopic analysis; Kimmeridgian; latitudinal gradient; marine environment; oxygen isotope; paleoclimate; sea level change; sea surface temperature; seasonality; shell; stable isotope; water mass; Lower Saxony Basin; North German Basin; Bivalvia; Brachiopoda; Ostreidae
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/151079
作者单位	Institute for Geology, Leibniz University Hannover, Callinstraße 30, Hannover, Germany; Institute of Earth Sciences, University of Lausanne, 1022 Chavannes-près-Renens, Lausanne, Switzerland; LBEG, State Authority of Mining, Energy and Geology, Stilleweg 2, Hannover, Germany; Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus, Denmark
推荐引用方式 GB/T 7714	Zuo F.,Heimhofer U.,Huck S.,et al. Climatic fluctuations and seasonality during the Kimmeridgian (Late Jurassic): Stable isotope and clay mineralogical data from the Lower Saxony Basin; Northern Germany[J],2019,517.
APA	Zuo F.,Heimhofer U.,Huck S.,Adatte T.,Erbacher J.,&Bodin S..(2019).Climatic fluctuations and seasonality during the Kimmeridgian (Late Jurassic): Stable isotope and clay mineralogical data from the Lower Saxony Basin; Northern Germany.Palaeogeography, Palaeoclimatology, Palaeoecology,517.
MLA	Zuo F.,et al."Climatic fluctuations and seasonality during the Kimmeridgian (Late Jurassic): Stable isotope and clay mineralogical data from the Lower Saxony Basin; Northern Germany".Palaeogeography, Palaeoclimatology, Palaeoecology 517(2019).