Arid
DOI10.1016/j.aeolia.2015.06.007
Landward-advancing Quaternary eolianites of Bermuda
Rowe, Mark P.; Bristow, Charlie S.
通讯作者Rowe, Mark P.
来源期刊AEOLIAN RESEARCH
ISSN1875-9637
EISSN2212-1684
出版年2015
卷号19页码:235-249
英文摘要

The landscape of Bermuda is dominated by Quaternary carbonate cemented dunes, or "eolianites", which form the islands’ topography. Sections through the dunes are revealed in extensive natural and man-made rock faces, which expose the dune stratigraphy as well as the preserved morphology. An analysis of 3751 foreset measurements confirms the conclusion reached by earlier researchers that Bermuda’s dunes advanced sub-perpendicularly to the coast in a landward direction away from source beaches. Dune orientation, being multi-directional, is not consistent with northeast net sand transportation predicted by a drift potential analysis of modern wind data. The putative predisposition of Bermuda’s carbonate dunes to rapid cementation is supposed to have curtailed their landward advance such that younger dunes developed as static ridges at the seaward margin of their lithified predecessors. Geological mapping has revealed, however, that in many cases young dunes did advance inland onto interior terrain, overstepping older dune ridges. Molds of large trees, preserved within the dunes, and a sharp contact of steep slip-face dune foresets on palaeosols evoke the encroachment of landward-advancing precipitation ridges into a forested landscape. The internal structure of the dunes, featuring thick sets of slip-face foresets truncated by sub-horizontal planar bounding surfaces, uphold the ascendancy of sand transportation processes over those of sand retention and vertical accretion. Although meteoric cementation was responsible for the ultimate preservation of eolianite ridges which dominate Bermuda’s landscape, it took effect too slowly to influence the behaviour of the carbonate dunes at the time of their emplacement. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Eolianite Carbonate coastal dunes Dune cementation Advancing dunes Transgressive dunes Bermuda geology
类型Article
语种英语
国家England
收录类别SCI-E
WOS记录号WOS:000367023000010
WOS关键词COASTAL SAND DUNES ; SEDIMENTARY STRUCTURES ; TRACE FOSSILS ; NORTH-AMERICA ; U-SERIES ; AUSTRALIA ; STRATIGRAPHY ; ISRAEL ; BEACH ; DESERTS
WOS类目Geography, Physical
WOS研究方向Physical Geography
来源机构University of London
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/185507
作者单位Univ London, Dept Earth & Planetaty Sci, London WC1E 7HX, England
推荐引用方式
GB/T 7714
Rowe, Mark P.,Bristow, Charlie S.. Landward-advancing Quaternary eolianites of Bermuda[J]. University of London,2015,19:235-249.
APA Rowe, Mark P.,&Bristow, Charlie S..(2015).Landward-advancing Quaternary eolianites of Bermuda.AEOLIAN RESEARCH,19,235-249.
MLA Rowe, Mark P.,et al."Landward-advancing Quaternary eolianites of Bermuda".AEOLIAN RESEARCH 19(2015):235-249.
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