干旱区生态环境知识资源中心(Arid): Sequence stratigraphy and distribution of organic-rich Lower Cretaceous mixed clastic-carbonate strata in Matruh Basin, northwestern Egypt: Constrains on the Tethyan sea level changes, palaeoclimate, and tectonics

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DOI	10.1016/j.marpetgeo.2021.105105
	Sequence stratigraphy and distribution of organic-rich Lower Cretaceous mixed clastic-carbonate strata in Matruh Basin, northwestern Egypt: Constrains on the Tethyan sea level changes, palaeoclimate, and tectonics
	Deaf, Amr S.
通讯作者	Deaf, AS (corresponding author), Assiut Univ, Fac Sci, Geol Dept, Assiut 71516, Egypt.
来源期刊	MARINE AND PETROLEUM GEOLOGY
ISSN	0264-8172
EISSN	1873-4073
出版年	2021
卷号	129
英文摘要	Integrated palynological, lithological, and geophysical analyses of the Lower Cretaceous (upper Hauterivian-Aptian) in Matruh Basin enabled conducting a high-resolution sequence stratigraphic analysis. Fluctuations of the continental/marine palynomorphs ratio reflect changes in the Tethyan 3rd order sea levels and are mirrored by eminent vertical changes in the spontaneous potential and the lithofacies. These are used with abundance of the marine phytoplanktons and opaque/translucent phytoclasts ratio to identify three 3rd order (SQ1: 132.4-120.8 Ma, SQ2: 120.8-115.2 Ma, and SQ3: 115.2-113 Ma) and seven 4th order genetic sequences and to study the impact of the allogenic and autogenic processes on their deposition. Deposition of the deltaic elastic systems tracts of the lower-middle Alam El Bueib (late Hauterivian-early Barremian) and Dahab (late Aptian) formations reflect the interaction between the regional humid climate and the Tethyan 3rd order sea levels, which superimposed the Tethyan 2nd order sea level. Interferences of minor regional tectonics were also important. The argillaceous deposits possess large amounts of terrestrial organic matter of low hydrogen index (HI: 185.8-211.5 mg HC/g TOC) indicating gas organic facies. These deposits show relatively high organic richness (1.81-2.50 TOC wt %) due to relatively low sediment dilution and water circulation (i.e. suboxic-anoxic conditions) and high primary productivity due to high riverine nutrient inputs. Deposition of the inner-middle shelf clastic-carbonate systems tracts of the upper Alam El Bueib and Alamein formations (latest Barremian-middle Aptian) reflects the interaction between the climatically induced low terrigenous influx and carbonate sedimentation due to shift to relatively dry climate, changes in the Tethyan 3rd order sea levels, and the middle Aptian regional minor uplift. These systems tracts show relatively large amounts of terrestrial organic matter, a notable marine organic matter signature, and intermediate HI (283.1-239.0 mg HC/g TOC) indicating gas/oil organic facies. The shales and siltstones are relatively organic richer (1.88-2.28 TOC wt %) than the pure and the argillaceous dolostones (1.46-1.94 TOC wt %). This organic richness is related to combined low sedimentation rates, low water circulation (i.e. dysoxic-suboxic to suboxic-anoxic conditions), and relatively high primary productivity. Overall, the Tethyan sea level changes, regional climate, and regional tectonics played a major role in the deposition of the organic-rich syn-rift Lower Cretaceous deposits in Matruh Basin.
英文关键词	Palynofacies Organic facies Organic richness Sequence stratigraphy Cretaceous Tethys Northwestern Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000656959600001
WOS关键词	NORTHERN WESTERN DESERT ; GEOCHEMICAL CHARACTERISTICS ; VOCONTIAN BASIN ; SOURCE ROCKS ; PALYNOFACIES ; ARCHITECTURE ; SUCCESSION ; FACIES ; PALYNOSTRATIGRAPHY ; ENVIRONMENT
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/2XILL650/351114
作者单位	[Deaf, Amr S.] Assiut Univ, Fac Sci, Geol Dept, Assiut 71516, Egypt
推荐引用方式 GB/T 7714	Deaf, Amr S.. Sequence stratigraphy and distribution of organic-rich Lower Cretaceous mixed clastic-carbonate strata in Matruh Basin, northwestern Egypt: Constrains on the Tethyan sea level changes, palaeoclimate, and tectonics[J],2021,129.
APA	Deaf, Amr S..(2021).Sequence stratigraphy and distribution of organic-rich Lower Cretaceous mixed clastic-carbonate strata in Matruh Basin, northwestern Egypt: Constrains on the Tethyan sea level changes, palaeoclimate, and tectonics.MARINE AND PETROLEUM GEOLOGY,129.
MLA	Deaf, Amr S.."Sequence stratigraphy and distribution of organic-rich Lower Cretaceous mixed clastic-carbonate strata in Matruh Basin, northwestern Egypt: Constrains on the Tethyan sea level changes, palaeoclimate, and tectonics".MARINE AND PETROLEUM GEOLOGY 129(2021).

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