干旱区生态环境知识资源中心(Arid): Petrogenesis and tectonic implications of the Maladob ring complex in the South Eastern Desert, Egypt: new insights from mineral chemistry and whole-rock geochemistry

Arid

DOI	10.1007/s00531-020-01937-2
	Petrogenesis and tectonic implications of the Maladob ring complex in the South Eastern Desert, Egypt: new insights from mineral chemistry and whole-rock geochemistry
	Abdel-Karim, Abdel-Aal; Azer, Mokhles; Sami, Mabrouk
通讯作者	Sami, M
来源期刊	INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN	1437-3254
EISSN	1437-3262
英文摘要	Alkaline ring complexes are widely distributed in the south Eastern Desert (SED) of Egypt, but their petrogenesis and geodynamic settings are a matter of many discussions. In this contribution, mineral chemistry, and whole-rock geochemical data of the Maladob intrusive rocks were used to investigate their petrogenesis. The Maladob ring complex is a small alkaline intrusion in the SED of Egypt, composed of oversaturated syenite, quartz syenites and peralkaline granite. The rocks consist of K-feldspar (Or(94-97)) and albite (An(0-1)), alkali amphiboles (arfvedsonite and ferro-katophorite), sodic pyroxene (aegirine), with accessory aenigmatite, zircon, apatite, ilmenite, magnetite and titanite. Geochemically, the rocks are peralkaline, show distinctive geochemical characteristics such as low contents of CaO, MgO, Sr and high contents of alkalis, Rb, Nb, Y, and REE, typical of A-type granites. The rocks are weakly to moderately fractionated with a general enrichment in LREE [(La/Sm)(N) = 2.96-3.64]. Typically, the Maladob rocks are classified as within plate granites and exhibit A1 subtype characteristics. We suggest that the Maladob rocks were formed from a similar OIB-like mafic magma by fractional crystallization. The fractionation of feldspars and mafic minerals play a significant role during magma evolution. During the Mesozoic intraplate magmatism, the upwelling of asthenosphere causes underplating of lithospheric OIB-like magma which was subjected to prolonged fractional crystallization to produce the Maladob syenites and peralkaline granite.
英文关键词	Alkaline ring complex Fractional crystallization Syenite Peralkaline granite Nubian Shield Egypt
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000575716000002
WOS关键词	A-TYPE GRANITES ; U-PB GEOCHRONOLOGY ; ABU-KHRUQ COMPLEX ; COMPOSITIONAL VARIABILITY ; CHEMICAL CHARACTERISTICS ; EXPERIMENTAL CONSTRAINTS ; SOUTHEASTERN DESERT ; NEPHELINE SYENITES ; CHINA CONSTRAINTS ; ALKALINE GRANITES
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/2XILL650/328328
作者单位	[Abdel-Karim, Abdel-Aal] Zagazig Univ, Fac Sci, Geol Dept, Zagazig, Egypt; [Azer, Mokhles] Natl Res Ctr, Geol Sci Dept, Cairo, Egypt; [Sami, Mabrouk] Menia Univ, Fac Sci, Geol Dept, El Minia 61519, Egypt
推荐引用方式 GB/T 7714	Abdel-Karim, Abdel-Aal,Azer, Mokhles,Sami, Mabrouk. Petrogenesis and tectonic implications of the Maladob ring complex in the South Eastern Desert, Egypt: new insights from mineral chemistry and whole-rock geochemistry[J].
APA	Abdel-Karim, Abdel-Aal,Azer, Mokhles,&Sami, Mabrouk.
MLA	Abdel-Karim, Abdel-Aal,et al."Petrogenesis and tectonic implications of the Maladob ring complex in the South Eastern Desert, Egypt: new insights from mineral chemistry and whole-rock geochemistry".INTERNATIONAL JOURNAL OF EARTH SCIENCES