气候变化领域集成服务门户(CCPortal): Reconstructing a high paleolatitude Mesozoic paleoenvironment from a truncated and deeply buried regolith; Norwegian North Sea

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DOI	10.1016/j.palaeo.2019.04.031
	Reconstructing a high paleolatitude Mesozoic paleoenvironment from a truncated and deeply buried regolith; Norwegian North Sea
	Riber L.; Driese S.G.; Stinchcomb G.E.; Dypvik H.; Sørlie R.
发表日期	2019
ISSN	0031-0182
起始页码	60
结束页码	77
卷号	528
英文摘要	The paleoregolith in this study was unconformably overlain by lower Cretaceous (Valanginian)marine deposits of the Åsgard Formation and buried below two kilometers of sediments, on the Utsira High, Norwegian North Sea. The upwards intensification of chemical alteration, manifested in the replacement of feldspars by clays, leaching of base cations and reduced mechanical rock strength, in addition to the presence of terrestrial biotitic features, suggested weathering during subaerial exposure of the Utsira High during the Mesozoic. The paleoregolith can be divided into three weathering facies: altered coherent rock, saprock and saprolite, whereas the absence of true soil horizons suggested erosional truncation of the regolith before burial. Possible remnants of the eroded soil were identified as pedogenic mud aggregates in the overlying Åsgard Formation, bearing similar compositional characteristics as the saprolite. Clay mineralogy, bulk geochemical composition, micromorphology and depth of biotic features were used to reconstruct the paleoenvironmental conditions that prevailed during the formation of the regolith in the Mesozoic North Sea. Our results point to a regolith formation under periodically water-restricted conditions, promoting the co-existence of interstratified illite-smectite (beidellite)and kaolinite, deep presence of endomycorrhizae (the fungal extension of the root structure)and precipitation of iron oxide nodules. Application of recently developed geochemical climofunctions indicated that the regolith formed in a mesic (10–12 °C)and subhumid (1157–1406 mm/yr)environment, and under strongly acidic soil conditions (pH 5.2–5.6). © 2019 Elsevier B.V.
语种	英语
scopus关键词	acidity; chemical weathering; Cretaceous; iron oxide; leaching; Mesozoic; micromorphology; paleoenvironment; paleolatitude; precipitation (chemistry); reconstruction; regolith; soil horizon; subaerial exposure; Atlantic Ocean; North Sea; Norway
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/150932
作者单位	Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, Oslo, NO-0316, Norway; Terrestrial Paleoclimatology Group, Department of Geosciences, Baylor University, 1 Bear Place #97354, Waco, TX 76798-7354, United States; Watershed Studies Institute and Department of Geosciences, Murray State University, Murray, KY 42071, United States; Lundin Norway AS, Strandveien 4, Lysaker, NO-1366, Norway
推荐引用方式 GB/T 7714	Riber L.,Driese S.G.,Stinchcomb G.E.,et al. Reconstructing a high paleolatitude Mesozoic paleoenvironment from a truncated and deeply buried regolith; Norwegian North Sea[J],2019,528.
APA	Riber L.,Driese S.G.,Stinchcomb G.E.,Dypvik H.,&Sørlie R..(2019).Reconstructing a high paleolatitude Mesozoic paleoenvironment from a truncated and deeply buried regolith; Norwegian North Sea.Palaeogeography, Palaeoclimatology, Palaeoecology,528.
MLA	Riber L.,et al."Reconstructing a high paleolatitude Mesozoic paleoenvironment from a truncated and deeply buried regolith; Norwegian North Sea".Palaeogeography, Palaeoclimatology, Palaeoecology 528(2019).