干旱区生态环境知识资源中心(Arid): Astronomically forced sequence development of terrestrial massive sand-sheet, inland sabkha and palustrine units, Lower Miocene Hadrukh Formation, eastern Saudi Arabia

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DOI	10.1016/j.jafrearsci.2020.103914
	Astronomically forced sequence development of terrestrial massive sand-sheet, inland sabkha and palustrine units, Lower Miocene Hadrukh Formation, eastern Saudi Arabia
	Alkhaldi, Fawwaz M.; Read, J. Fred; Al-Tawil, Aus A.
通讯作者	Alkhaldi, FM
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2020
卷号	171
英文摘要	The Lower Miocene (lower Aquitanian) Hadrukh Formation (30-65 m thick), Al-Lidam area, Eastern Province, Saudi Arabia, was cored to examine sequence development within a non-marine siliciclastic-prone coastal plain in a semi-arid distal foreland setting. Facies are dominated by structureless quartz sands (terrestrial sand-sheets/shrub-coppice dunes or nebkhas), along with gypsiferous/calcareous quartz sands and gypsites (inland sabkhas), brecciated and sheet-cracked sandy carbonates/calcareous sands (palustrine), and some coarse lithic-clast quartz sands (fluvial) and associated paleosol-capped red and green-gray mudrock (interfluves). However, they lack the intercalated eolian laminated and cross-bedded sands of this hyper-arid region today, reflecting semi-arid Early Miocene conditions. Spectral analysis of core gamma-ray logs shows astronomical forcing within the eccentricity, obliquity and precessional bands. Tuning indicates the Hadrukh Formation is a composite sequence (similar to 1.3 myr duration) containing three (400 kyr) major sequences and eight minor sequences. Fluvial facies are locally developed at the base and near the top of the composite sequence. Massive sand sheet facies dominate the sequences, and sandy evaporitic facies and palustrine sandy carbonates are best developed in upper parts of sequences but interfinger within short distances with other facies. Subsidence and differential warping caused thickness and facies variation but the succession shows a strong astronomical signal. Astronomical forcing controlled semi-arid vs. more humid phases of deposition, as well as the position of base level, elevation of the ground-water table and presumably density of shrub cover. The three major sequence boundaries developed during 400 kyr eccentricity minima and cooling, while minor sequence boundaries formed during short eccentricity (100 kyr) cooling events.
英文关键词	Hadrukh formation Lower miocene Structureless terrestrial sand-sheets Astronomical forcing Saudi Arabia
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000581203500002
WOS关键词	STRATIGRAPHY ; EVOLUTION ; DEPOSITS ; MARGIN ; FIELD ; ENVIRONMENT ; TERTIARY ; RHYTHMS ; EUSTASY ; SYSTEMS
WOS类目	Geosciences, Multidisciplinary
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/2XILL650/327037
作者单位	[Alkhaldi, Fawwaz M.; Al-Tawil, Aus A.] Saudi Aramco, Dhahran, Saudi Arabia; [Read, J. Fred] Virginia Tech, Dept Geosci, Blacksburg, VA USA
推荐引用方式 GB/T 7714	Alkhaldi, Fawwaz M.,Read, J. Fred,Al-Tawil, Aus A.. Astronomically forced sequence development of terrestrial massive sand-sheet, inland sabkha and palustrine units, Lower Miocene Hadrukh Formation, eastern Saudi Arabia[J],2020,171.
APA	Alkhaldi, Fawwaz M.,Read, J. Fred,&Al-Tawil, Aus A..(2020).Astronomically forced sequence development of terrestrial massive sand-sheet, inland sabkha and palustrine units, Lower Miocene Hadrukh Formation, eastern Saudi Arabia.JOURNAL OF AFRICAN EARTH SCIENCES,171.
MLA	Alkhaldi, Fawwaz M.,et al."Astronomically forced sequence development of terrestrial massive sand-sheet, inland sabkha and palustrine units, Lower Miocene Hadrukh Formation, eastern Saudi Arabia".JOURNAL OF AFRICAN EARTH SCIENCES 171(2020).