NDLI: Late Neoproterozoic strongly peraluminous leucogranites, South Eastern Desert, Egypt

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Late Neoproterozoic strongly peraluminous leucogranites, South Eastern Desert, Egypt – petrogenesis and geodynamic significance

Content Provider	Springer Nature Link
Author	Moghazi, A. M. Hassanen, M. A. Mohamed, F. H. Ali, S.
Copyright Year	2004
Abstract	Late Neoproterozoic garnet-bearing leucogranites are developed locally along thrust faults in the South Eastern Desert, Egypt. This work presents field observations, whole rock major and trace element abundances, Rb–Sr isotope data and mineral chemistry for three occurrences in the Sikait-Nugrus area. Field observations show that the leucogranites cut the faults and their contact with the country rocks is sharp with no indication of contact metamorphism. They were intruded into a low-grade metamorphosed ophiolitic melange and a high-grade metamorphosed metasedimentary succession of biotite schist composition. Numerous biotite schist enclaves, having irregular and diffuse contacts, are recorded within the leucogranites. Whole rock Rb–Sr ages of the leucogranites from two different localities are 610±20 and 594±12 Ma respectively; they are interpreted as emplacement ages. The leucogranites contain more than 70% SiO2, and they are strongly peraluminous (A/CNK>1.1) with low TiO2, Fe2O3, MgO, CaO, Ba, Sr, LREE, Eu/Eu and Sr/Ba and high Rb, Rb/Zr, Rb/Sr and Rb/Ba. These geochemical parameters and the low initial 87Sr/86Sr ratios (∼0.703) indicate crustal derivation by dehydration partial melting from a juvenile protolith similar to the exposed biotite-rich metasediments. Models for the tectonic setting of these leucogranites suggest their emplacement during an extensional tectonic stage that follows continental collision. It is proposed that crustal heating, caused by decompression along shear zones, is responsible for the production of these granitic melts. The results support previous hypotheses and further document a regional late Neoproterozoic extensional tectonic event, which is probably related to the initial break-up of Gondwana.
Starting Page	19
Ending Page	41
Page Count	23
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	81
Issue Number	1-2
e-ISSN	14381168
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-02-17
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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