Arid
DOI10.1111/sed.12382
Palaeo-environment in an ancient low-latitude, arid lacustrine basin with loessite: The Smith Bank Formation (Early Triassic) in the Central North Sea, UK Continental Shelf
Wilkins, Anne D.1; Hurst, Andrew1; Wilson, Michael J.2,3; Archer, Stuart1,4
通讯作者Wilkins, Anne D.
来源期刊SEDIMENTOLOGY
ISSN0037-0746
EISSN1365-3091
出版年2018
卷号65期号:2页码:335-359
英文摘要

Predominantly fine-grained strata were deposited in the Smith Bank Formation (Early Triassic) in the Central North Sea area of the Northern Permian Basin. Previously regarded as monotonous red claystone, examination of continuous core reveals abundant stratification, significant variation in colour, siltstone as the prevalent average grain size, and claystone is rare. Loessite occurs beyond the north-western lacustrine margin, and aerosol dust has inundated clay pellets derived from aeolian reworking of the desiccated lake floor. The loessite has limited evidence of pluvial reworking but rare fossil roots testify to sufficient moisture to sustain plants. Loessite has not previously been differentiated successfully from other fine-grained strata in the subsurface, but this study defines the presence of random grain-fabric orientation as an intrinsic unequivocal characteristic of loessite that formed during air-fall deposition of aerosol dust. Comparison with outcrop data verifies the utility of grain fabric to differentiate loessite. Tosudite, an aluminous di-octahedral regularly ordered mixed-layer chlorite/smectite, which is rare in sedimentary rock, forms a significant proportion (10 to 21%) of the clay mineral fraction of loessite along with a similar quantity of kaolinite. In all other samples, only illite and chlorite are identified, which is typical of fine-grained Triassic strata. In a location, close to the southern lake margin, lacustrine strata are characterized by fining-upward couplets of very fine-grained sandstone into siltstone and mudstone, with occasional desiccated surfaces. Small sand injections and associated sand extrusions are common and indicate periodic fluidization of sand. Precise stratigraphic location of the Smith Bank Formation is problematic because of extremely sparse fossil preservation; however, there is no sedimentological evidence for a period of hyperaridity known from the early Olenekian in continental Europe, which may mean that the North Permian Basin was never hyperarid or that the Smith Bank Formation is restricted to the Induan.


英文关键词Aeolian arid Early Triassic lacustrine loessite palaeoclimate siltstone wind-blown
类型Article
语种英语
国家Scotland ; Russia ; Denmark
收录类别SCI-E
WOS记录号WOS:000419514900001
WOS关键词PARTICLE-SIZE DISTRIBUTIONS ; CLAY MINERALOGY ; GRAIN-SIZE ; MAROON FORMATION ; CLIMATE ; STRATIGRAPHY ; EVOLUTION ; PALEOGEOGRAPHY ; PALEOCLIMATE ; PRESERVATION
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/213130
作者单位1.Univ Aberdeen, Dept Geol & Petr Geol, Kings Coll, Aberdeen AB24 3UE, Scotland;
2.James Hutton Inst, Countesswells Rd, Aberdeen AB15 8QH, Scotland;
3.Tomsk Polytech Univ, Tomsk 634050, Russia;
4.Maersk Oil, Esplanaden 50, Copenhagen, Denmark
推荐引用方式
GB/T 7714
Wilkins, Anne D.,Hurst, Andrew,Wilson, Michael J.,et al. Palaeo-environment in an ancient low-latitude, arid lacustrine basin with loessite: The Smith Bank Formation (Early Triassic) in the Central North Sea, UK Continental Shelf[J],2018,65(2):335-359.
APA Wilkins, Anne D.,Hurst, Andrew,Wilson, Michael J.,&Archer, Stuart.(2018).Palaeo-environment in an ancient low-latitude, arid lacustrine basin with loessite: The Smith Bank Formation (Early Triassic) in the Central North Sea, UK Continental Shelf.SEDIMENTOLOGY,65(2),335-359.
MLA Wilkins, Anne D.,et al."Palaeo-environment in an ancient low-latitude, arid lacustrine basin with loessite: The Smith Bank Formation (Early Triassic) in the Central North Sea, UK Continental Shelf".SEDIMENTOLOGY 65.2(2018):335-359.
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