Arid
DOI10.1080/00206814.2014.907755
The Wadi Zaghra metasediments of Sinai, Egypt: new constraints on the late Cryogenian-Ediacaran tectonic evolution of the northernmost Arabian-Nubian Shield
Andresen, Arild1; Abu El-Enen, Mahrous M.2; Stern, Robert J.3; Wilde, Simon A.4; Ali, Kamal A.5
通讯作者Andresen, Arild
来源期刊INTERNATIONAL GEOLOGY REVIEW
ISSN0020-6814
EISSN1938-2839
出版年2014
卷号56期号:8页码:1020-1038
英文摘要

The depositional age of the Wadi Zaghra metasediments (Zaghra Formation) of the Sa’al-Zaghra metamorphic complex (Sinai) in the Arabian-Nubian Shield (ANS) has been constrained by LA-ICP-MS dating of zircons from (1) metaconglomerate granitoid clasts, (2) the metaconglomerate matrix, (3) biotite-schist, and (4) diorites and granites intruding the metasediments. Three granitoid boulders from a metadiamictite of the Zaghra Formation give crystallization ages of 651 +/- 3, 647 +/- 3, and 640 +/- 4 Ma respectively. Detrital zircon age populations from laminated siltsones and conglomerate matrix vary somewhat with stratigraphic position, a variation best explained by changes in depositional environment and source area with time. Three distinct zircon age populations are identified in the matrix; at ca. 1000, 750, and 630 Ma, with less pronounced peaks at similar to 780 and similar to 800 Ma. The youngest detrital zircons indicate deposition after 630-625 Ma. The emplacement age of the post-depositional intrusives is enigmatic due to a large population of xenocrystic zircons, but is interpreted to be as old as ca. 615 Ma. This implies deposition and deformation of the Zaghra Formation in the time interval 625-615 Ma, thus older than the inferred depositional age of the Hammamat deposits in the Eastern Desert of Egypt, which is commonly correlated. The inferred depositional age is similar to the deposits in nearby Rutig Basin, where conglomerates were deposited in two pulses; at ca. 620-610 and 600-590 Ma. The appearance of late Mesoproterozoic (ca. 1.1 to -1.0 Ga) detrital zircons in the fine-grained laminated matrix facies of the Zaghra Formation demonstrates that similar to 1.0 Ga basement rocks (Sa’al terrane?) were exposed when Zaghra basin sediments were being deposited.


英文关键词Arabian-Nubian Shield Neoproterozoic crust U-Pb zircon age Zaghra Formation Egypt Sinai
类型Article
语种英语
国家Norway ; Egypt ; USA ; Australia ; Saudi Arabia
收录类别SCI-E
WOS记录号WOS:000337688100007
WOS关键词NORTH EASTERN DESERT ; NEOPROTEROZOIC STRUCTURAL EVOLUTION ; METAMORPHIC CORE COMPLEX ; U-PB GEOCHRONOLOGY ; AFRICAN OROGEN ; SE SINAI ; SARAMUJ CONGLOMERATE ; CRUSTAL EVOLUTION ; SEDIMENTARY ROCKS ; DETRITAL ZIRCONS
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/2XILL650/182647
作者单位1.Univ Oslo, Dept Geosci, Oslo, Norway;
2.Mansoura Univ, Fac Sci, Dept Geol, Mansoura, Egypt;
3.Univ Texas Dallas, Dept Geosci, Richardson, TX 75080 USA;
4.Curtin Univ, Dept Appl Geol, Perth, WA 6845, Australia;
5.King Abdulaziz Univ, Fac Earth Sci, Dept Mineral Resources & Rocks, Jeddah 21441, Saudi Arabia
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GB/T 7714
Andresen, Arild,Abu El-Enen, Mahrous M.,Stern, Robert J.,et al. The Wadi Zaghra metasediments of Sinai, Egypt: new constraints on the late Cryogenian-Ediacaran tectonic evolution of the northernmost Arabian-Nubian Shield[J],2014,56(8):1020-1038.
APA Andresen, Arild,Abu El-Enen, Mahrous M.,Stern, Robert J.,Wilde, Simon A.,&Ali, Kamal A..(2014).The Wadi Zaghra metasediments of Sinai, Egypt: new constraints on the late Cryogenian-Ediacaran tectonic evolution of the northernmost Arabian-Nubian Shield.INTERNATIONAL GEOLOGY REVIEW,56(8),1020-1038.
MLA Andresen, Arild,et al."The Wadi Zaghra metasediments of Sinai, Egypt: new constraints on the late Cryogenian-Ediacaran tectonic evolution of the northernmost Arabian-Nubian Shield".INTERNATIONAL GEOLOGY REVIEW 56.8(2014):1020-1038.
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