Arid
DOI10.1111/sed.12037
Facies model of a fine-grained, tide-dominated delta: Lower Dir Abu Lifa Member (Eocene), Western Desert, Egypt
Legler, Berit1; Johnson, Howard D.1; Hampson, Gary J.1; Massart, Benoit Y. G.1; Jackson, Chris A-L.1; Jackson, Matthew D.1; El-Barkooky, Ahmed2; Ravnas, Rodmar3
通讯作者Legler, Berit
来源期刊SEDIMENTOLOGY
ISSN0037-0746
EISSN1365-3091
出版年2013
卷号60期号:5页码:1313-1356
英文摘要

Existing facies models of tide-dominated deltas largely omit fine-grained, mud-rich successions. Sedimentary facies and sequence stratigraphic analysis of the exceptionally well-preserved Late Eocene Dir Abu Lifa Member (Western Desert, Egypt) aims to bridge this gap. The succession was deposited in a structurally controlled, shallow, macrotidal embayment and deposition was supplemented by fluvial processes but lacked wave influence. The succession contains two stacked, progradational parasequence sets bounded by regionally extensive flooding surfaces. Within this succession two main genetic elements are identified: non-channelized tidal bars and tidal channels. Non-channelized tidal bars comprise coarsening-upward sandbodies, including large, downcurrent-dipping accretion surfaces, sometimes capped by palaeosols indicating emergence. Tidal channels are preserved as single-storey and multilateral bodies filled by: (i) laterally migrating, elongate tidal bars (inclined heterolithic strata, 5 to 25m thick); (ii) forward-facing lobate bars (sigmoidal heterolithic strata, up to 10m thick); (iii) side bars displaying oblique to vertical accretion (4 to 7m thick); or (iv) vertically-accreting mud (1 to 4m thick). Palaeocurrent data show that channels were swept by bidirectional tidal currents and typically were mutually evasive. Along-strike variability defines a similar large-scale architecture in both parasequence sets: a deeply scoured channel belt characterized by widespread inclined heterolithic strata is eroded from the parasequence-set top, and flanked by stacked, non-channelized tidal bars and smaller channelized bodies. The tide-dominated delta is characterized by: (i) the regressive stratigraphic context; (ii) net-progradational stratigraphic architecture within the succession; (iii) the absence of upward deepening trends and tidal ravinement surfaces; and (iv) architectural relations that demonstrate contemporaneous tidal distributary channel infill and tidal bar accretion at the delta front. The detailed facies analysis of this fine-grained, tide-dominated deltaic succession expands the range of depositional models available for the evaluation of ancient tidal successions, which are currently biased towards transgressive, valley-confined estuarine and coarser grained deltaic depositional systems.


英文关键词Elongated tidal bar Fayum Depression inclined heterolithic strata lobate tidal bar mutually evasive channel Qasr El-Sagha Formation
类型Review
语种英语
国家England ; Egypt ; Norway
收录类别SCI-E
WOS记录号WOS:000321696600009
WOS关键词INCLINED HETEROLITHIC STRATIFICATION ; LARGE-SCALE GLACIATION ; DEPOSITIONAL SYSTEMS ; RIVER DELTA ; BOOK-CLIFFS ; FLUID-MUD ; STRATIGRAPHIC EVOLUTION ; DISTRIBUTARY CHANNELS ; SEQUENCE STRATIGRAPHY ; FRONTIER FORMATION
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/2XILL650/179928
作者单位1.Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW2 7AZ, England;
2.Cairo Univ & Shell Egypt, Dept Geol, Cairo 2681, Egypt;
3.Norske Shell, N-4056 Tananger, Norway
推荐引用方式
GB/T 7714
Legler, Berit,Johnson, Howard D.,Hampson, Gary J.,et al. Facies model of a fine-grained, tide-dominated delta: Lower Dir Abu Lifa Member (Eocene), Western Desert, Egypt[J],2013,60(5):1313-1356.
APA Legler, Berit.,Johnson, Howard D..,Hampson, Gary J..,Massart, Benoit Y. G..,Jackson, Chris A-L..,...&Ravnas, Rodmar.(2013).Facies model of a fine-grained, tide-dominated delta: Lower Dir Abu Lifa Member (Eocene), Western Desert, Egypt.SEDIMENTOLOGY,60(5),1313-1356.
MLA Legler, Berit,et al."Facies model of a fine-grained, tide-dominated delta: Lower Dir Abu Lifa Member (Eocene), Western Desert, Egypt".SEDIMENTOLOGY 60.5(2013):1313-1356.
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