Arid
DOI10.1130/G22798A.1
An allochthonous salt canopy on Axel Heiberg Island, Sverdrup Basin, Arctic Canada
Jackson, M. P. A.; Harrison, J. C.
通讯作者Jackson, M. P. A.
来源期刊GEOLOGY
ISSN0091-7613
出版年2006
卷号34期号:12页码:1045-1048
英文摘要

Axel Heiberg Island (northern Nunavut) contains the thickest Mesozoic section in the Sverdrup Basin. The similar to 370-km-long island is second only to Iran in its concentration of exposed evaporite diapirs. However, the tectonics of this remote region is not well known. A polar desert on the island provides excellent exposure of 46 diapirs of Carboniferous evaporites and associated minibasins. Paleogene (Eurekan) anticlines trend roughly north on a regular similar to 20 km wavelength and probably detach on autochthonous Carboniferous Otto Fiord evaporites. In contrast, a 60-km-wide area, known as the wall-and-basin structure (WABS) province, has bimodal fold trends and irregular wavelengths of < 10 km. Here, crooked walls of diapiric anhydrite crop out in the cores of tight anticlines. Wider synclinal minibasins separate the diapiric walls. We interpret the WABS province to detach on a shallow evaporite canopy. This comprises an allochthonous coalescence of evaporite diapirs that spread extrusively during the Hauterivian (Early Cretaceous, ca. 130 Ma), close to the onset of seafloor spreading in the Arctic Ocean and of flood basalt volcanism associated with Alpha Ridge. Since then, the evaporite canopy has yielded second-generation diapirs, now exhumed and exposed by modest Eurekan shortening. Strata record minibasin evolution and diapirism since at least the Late Triassic. Stratigraphic thinning against diapirs and spectacular angular unconformities at four levels are present between the Jurassic and Paleocene. The most widespread is the Early Cretaceous event marking the time of canopy emplacement. Outcrops record the later fate of the canopy, including exposure, onlap of diapirs, and off-diapir debris flows.


英文关键词diapir evaporite salt canopy allochthonous salt debris flow minibasin angular unconformity Hauterivian flood basalt dike swarm Eurekan orogeny Alpha Ridge
类型Article
语种英语
国家USA ; Canada
收录类别SCI-E
WOS记录号WOS:000242630000014
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/2XILL650/151522
作者单位(1)Univ Texas, Jackson Sch Geosci, Bur Econ Geol, Austin, TX 78713 USA;(2)Geol Survey Canada, Calgary, AB T2L 2A7, Canada
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GB/T 7714
Jackson, M. P. A.,Harrison, J. C.. An allochthonous salt canopy on Axel Heiberg Island, Sverdrup Basin, Arctic Canada[J],2006,34(12):1045-1048.
APA Jackson, M. P. A.,&Harrison, J. C..(2006).An allochthonous salt canopy on Axel Heiberg Island, Sverdrup Basin, Arctic Canada.GEOLOGY,34(12),1045-1048.
MLA Jackson, M. P. A.,et al."An allochthonous salt canopy on Axel Heiberg Island, Sverdrup Basin, Arctic Canada".GEOLOGY 34.12(2006):1045-1048.
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