干旱区生态环境知识资源中心(Arid): Mineral chemistry and monazite chemical Th-U-total Pb dating of the Wadi Muweilha muscovite pegmatite, Central Eastern Desert of Egypt: constraints on its origin and geodynamic evolution relative to the Arabian Nubian Shield

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DOI	10.1007/s00531-021-02152-3
	Mineral chemistry and monazite chemical Th-U-total Pb dating of the Wadi Muweilha muscovite pegmatite, Central Eastern Desert of Egypt: constraints on its origin and geodynamic evolution relative to the Arabian Nubian Shield
	Abdelfadil, Khaled M.; Mahdy, Nasser M.; Ondrejka, Martin; Putis, Marian
通讯作者	Mahdy, NM (corresponding author)，Nucl Mat Author, PO 530, Cairo, Egypt.
来源期刊	INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN	1437-3254
EISSN	1437-3262
出版年	2022-01
英文摘要	The Wadi Muweilha muscovite pegmatite in the Central Eastern Desert (CED) of Egypt is strongly influenced by a strikeslip shearing and fault system related to the final stage of the East African Orogen (EAO) in the Arabian Nubian Shield (ANS). It intrudes the volcano-sedimentary succession, occurs in large pegmatitic plugs, and is comprised of K-feldspar, quartz, plagioclase, and muscovite as rock-forming minerals, while abundant garnet, monazite-(Ce), Nb-depleted rutile, ilmenite, zircon, xenotime-(Y), and Y-thorite represent the rare metal minerals. Most minerals show several signatures of ductile/brittle deformations. Garnets form almandine-spessartine solid solutions and exhibit Mn bell-shaped type zoning, due to temperature decrease and fractionation of Fe-Mn during crystallization. The monazite occurs in three phases: pristine (Mnz1), recrystallized (Mnz2), and hydrothermal (Mnz3). The Y-Th-enriched Mn1 was altered into Y-Th-depleted Mnz3 associated with xenotime-thorite solid solutions (Y-thorite) via dissolution-reprecipitation mechanism. The mineral reaction happened along the preexisting microfractures (resulting from the former brittle deformation) that were used as pathways for interfacial fluids. The chemical and textural characteristics of monazite, garnet, and other minerals enhance the igneous origin of pegmatite and the relation to syn-tectonic I-type granitic magma source. The 641 +/- 5 Ma (2 sigma) age of Mnzl indicates that the post-collisional stage began after similar to 640 Ma in the north of the ANS. The date range (584-590 Ma) of Mnz2 is simultaneous with the rare metal-bearing post-collisional A-type granite in the CED, while the 538 to 563 Ma date range of Mnz3 may suggest a prolonged period (100 Ma) of the tectonic rejuvenation in the Mubarak-Barramiya Shear Belt at ca. 640-540 Ma.
英文关键词	Monazite chemical age Post-accretion structures Pegmatitic I-type magma Garnet zoning East African Orogen
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000749157000001
WOS关键词	ND ISOTOPE SYSTEMATICS ; RARE-METAL PEGMATITES ; GRANITIC PEGMATITES ; TRACE-ELEMENT ; ACCESSORY MINERALS ; MAGMATIC GARNET ; PETROGENETIC IMPLICATIONS ; HYDROTHERMAL ORIGINS ; WESTERN CARPATHIANS ; TECTONIC EVOLUTION
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/2XILL650/377073
作者单位	[Abdelfadil, Khaled M.] Sohag Univ, Fac Sci, Geol Dept, Sohag 82524, Egypt; [Mahdy, Nasser M.] Nucl Mat Author, PO 530, Cairo, Egypt; [Ondrejka, Martin; Putis, Marian] Comenius Univ, Fac Nat Sci, Dept Mineral & Petrol, Ilkovicova 6, Bratislava 84215, Slovakia
推荐引用方式 GB/T 7714	Abdelfadil, Khaled M.,Mahdy, Nasser M.,Ondrejka, Martin,et al. Mineral chemistry and monazite chemical Th-U-total Pb dating of the Wadi Muweilha muscovite pegmatite, Central Eastern Desert of Egypt: constraints on its origin and geodynamic evolution relative to the Arabian Nubian Shield[J],2022.
APA	Abdelfadil, Khaled M.,Mahdy, Nasser M.,Ondrejka, Martin,&Putis, Marian.(2022).Mineral chemistry and monazite chemical Th-U-total Pb dating of the Wadi Muweilha muscovite pegmatite, Central Eastern Desert of Egypt: constraints on its origin and geodynamic evolution relative to the Arabian Nubian Shield.INTERNATIONAL JOURNAL OF EARTH SCIENCES.
MLA	Abdelfadil, Khaled M.,et al."Mineral chemistry and monazite chemical Th-U-total Pb dating of the Wadi Muweilha muscovite pegmatite, Central Eastern Desert of Egypt: constraints on its origin and geodynamic evolution relative to the Arabian Nubian Shield".INTERNATIONAL JOURNAL OF EARTH SCIENCES (2022).