Arid
DOI10.1111/j.1365-3091.2008.00974.x
Sedimentology and architecture of the Douglas Creek terminal splay, Lake Eyre, central Australia
Fisher, John A.1,2; Krapf, Carmen B. E.3; Lang, Simon C.4; Nichols, Gary J.2; Payenberg, Tobias H. D.3,5
通讯作者Fisher, John A.
来源期刊SEDIMENTOLOGY
ISSN0037-0746
出版年2008
卷号55期号:6页码:1915-1930
英文摘要

Douglas Creek terminal splay, sited on the western shoreline of Lake Eyre North, central Australia, covers a surface area of approximately 4 km(2) with a down-system length of 2.5 km from the distributary channels terminus to the splay fringe. Two distributary channels feed two sediment lobes which have amalgamated to form the terminal splay. Three primary facies associations have been identified sub-dividing the creek terminus into distributary channel, proximal and distal splay sections. Proximal splay sediments are characterized by erosionally based, relatively thick (> 100 mm), stacked sheets of coarse to medium sand which commonly display trough and planar cross-bedding, whereas the distal splay is characterized by thin (generally < 50 mm) massive beds of very fine sand, silt and clay. The change in splay sedimentology is interpreted as reflecting the transition from bedload-dominated deposition to suspended load-dominated deposition from decelerating sheetfloods as they spread out from the channel onto the dry lake bed. A proximal to distal splay transition zone is also noted where deposits of both facies associations interfinger laterally and vertically. In scale, geometry and facies associations, the Douglas Creek terminal splay is very different to the often cited Neales terminal splay complex located 70 km to the north. It is suggested that these architectural differences reflect variations in discharge volume, input sediment distribution and the degree of vegetation cover. Understanding the variation in terminal splay architecture has very significant implications for the modelling of analogous subsurface petroleum systems, which at present relies on few modern-day analogues.


英文关键词Arid sedimentology central Australia dryland endorheic basins ephemeral rivers Lake Eyre sheetfloods terminal splay
类型Article
语种英语
国家England ; Australia
收录类别SCI-E
WOS记录号WOS:000261084900018
WOS关键词FLOW DEPOSITS ; BASIN ; MODEL ; BEDS ; EXAMPLES ; MIOCENE ; SYSTEM ; STREAM ; FANS
WOS类目Geology
WOS研究方向Geology
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/2XILL650/159171
作者单位1.BG Grp, Reading RG6 1PT, Berks, England;
2.Univ London, Dept Geol, Egham TW20 0EX, Surrey, England;
3.Univ Adelaide, Australian Sch Petr, Adelaide, SA 5005, Australia;
4.Woodside Energy Ltd, Perth, WA 6000, Australia;
5.Chevron Energy Technology Pty Ltd, Perth, WA 6000, Australia
推荐引用方式
GB/T 7714
Fisher, John A.,Krapf, Carmen B. E.,Lang, Simon C.,et al. Sedimentology and architecture of the Douglas Creek terminal splay, Lake Eyre, central Australia[J]. University of London,2008,55(6):1915-1930.
APA Fisher, John A.,Krapf, Carmen B. E.,Lang, Simon C.,Nichols, Gary J.,&Payenberg, Tobias H. D..(2008).Sedimentology and architecture of the Douglas Creek terminal splay, Lake Eyre, central Australia.SEDIMENTOLOGY,55(6),1915-1930.
MLA Fisher, John A.,et al."Sedimentology and architecture of the Douglas Creek terminal splay, Lake Eyre, central Australia".SEDIMENTOLOGY 55.6(2008):1915-1930.
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