Kubovics Imre and Abdel-Karim Abdel-Aal Mohamed: Crystallization of amphiboles in the Kid volcanic complex, Southern Sinai, Egypt : implications for magma evolution. In: Acta mineralogica-petrographica, (36). pp. 17-33. (1995)
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Abstract
The Kid volcanics consist of three main suites namely, basaltic andesite-andesite (BA-A), trachydacitedacite (TD-D) and rhyodacite-alkali rhyolite (RD-AR). Microprobe analyses of phenocrysts and groundmass of the amphiboles from rocks of these volcanic suites are presented in this paper. Amphiboles from BA-A suite range from tschermakite phenocryst cores to ferro tschermakitic hornblende phenocryst rims and groundmass. TD-D suite has ferroan pargasite phenocrysts and ferroan pargasitic hornblende groundmass. Amphiboles from RD-AR suite range from kaersutite and ferroan pargasite phenocryst cores to magnesian hastingsitic hornblende phenocryst rims and magnesian hastingsite groundmass. The amphiboles of Kid volcanics are Ti-rich, calcic-type. In most cases, amphibole phenocrysts from BA-A and RD-AR suites have the same evolution, reflect their cognate magmas. Moreover, both the TD-D and RDAR suites have close genetic relationship. The progressive evolutionary trend from phenocryst cores to phenocryst rims and groundmass and from intermediate (BA-A) to felsic (RD-AR) suite are responsible for the magmatic evolution of the Kid volcanic suites. In contrast, the concentration of amphibole composition as a function of pressure and temperature suggest an opposite trend for the grade of metamorphism of these suites. These calcic amphiboles are expected to be formed at high temperature (~700— 1000 "C) and low pressure (-0.2-3 Kb.) conditions.
Item Type: | Article |
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Journal or Publication Title: | Acta mineralogica-petrographica |
Date: | 1995 |
Volume: | 36 |
ISSN: | 0365-8066 |
Page Range: | pp. 17-33 |
Language: | English |
Publisher: | University of Szeged, Department of Mineralogy, Geochemistry and Petrology |
Place of Publication: | Szeged |
Related URLs: | http://acta.bibl.u-szeged.hu/39414/ |
Uncontrolled Keywords: | Kőzettan, Ásványtan, Földtan |
Additional Information: | Bibliogr.: 33. p. ; ill. ; összefoglalás angol nyelven |
Subjects: | 01. Natural sciences 01. Natural sciences > 01.05. Earth and related environmental sciences |
Date Deposited: | 2016. Oct. 17. 09:25 |
Last Modified: | 2022. Jul. 27. 11:16 |
URI: | http://acta.bibl.u-szeged.hu/id/eprint/24821 |
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