Rare-earth elements of granitoid rocks of St. Katherine area, South Sinai, Egypt

A group of granitic plutons and stocks outcrop in St. (Catherine area, South Sinai (Egypt). They belong to the Late Precambrian Pan-African belt. The granitoid rocks occupying St. Kathcrine area are composed of a comagmatic plutons and classified into three main phases according to their field relat...

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Bibliographic Details
Main Authors: Hassen Imbarak Sayed
Buda György
Format: Article
Published: University of Szeged, Department of Mineralogy, Geochemistry and Petrology Szeged 1996
Series:Acta mineralogica-petrographica 37
Kulcsszavak:Kőzettan, Ásványtan, Földtan
Subjects:
Online Access:http://acta.bibl.u-szeged.hu/24834
Description
Summary:A group of granitic plutons and stocks outcrop in St. (Catherine area, South Sinai (Egypt). They belong to the Late Precambrian Pan-African belt. The granitoid rocks occupying St. Kathcrine area are composed of a comagmatic plutons and classified into three main phases according to their field relations and compositions: 1- quartz diorite, granodiorite and quartz monzonite (Gr|), 2- monzogranite and biotite granite (Gr2), 3- syenogranite, alkali feldspar granite and granophyre (Gr3). The distribution of REEs show variations in each phases as well as within one lithological unit which allow the interpretation of complex genesis of the massif. The phase one (Gq) emplaced, as a basic magma in an intermediate magmatic chamber, containing a very low concentrations of REE. This has undergone a fractional crystallization, which resulted in an increase of the amount of £REE (average 102.16 ppm) with the moderately fractionated patterns (La/Sm = 6.07) and no significant negative Eu anomalies are found. Phase two (Gr2) has higher contents of ZREE (average 116.86 ppm), and more fractionated LREE (La/Sm = 7.90) with a small negative Eu-anomalies. Phase three (Gr3) has a high contents of ZREE (average 121.97 ppm) and fractionated LREE pattern with a relatively deep negative Eu-anomalies.
Physical Description:75-82
ISSN:0365-8066