Arid
DOI10.1007/s12517-013-1022-2
Hornblende gabbros of Wadi Az Zarib area, Central Eastern Desert, Egypt: opaque mineralogy, geochemistry, tectonic setting, and petrogenesis
Ali-Bik, Mohamed W.; Abd El Rahim, Said H.; Wahab, Wael Abdel
通讯作者Ali-Bik, Mohamed W.
来源期刊ARABIAN JOURNAL OF GEOSCIENCES
ISSN1866-7511
EISSN1866-7538
出版年2014
卷号7期号:10页码:4009-4027
英文摘要

A small intrusive fresh gabbroic mass intrudes the Neoproterozoic metasediments and Dokhan volcanics of Wadi Az Zarib area, Central Eastern Desert. It is composed of hornblende gabbros and leuco-hornblende gabbros. Their petrography, opaque mineralogy, and geochemistry are addressed to elucidate their tectonic setting and petrogenesis. They represent a subduction-related calc-alkaline magma that evolved in an island arc setting. In terms of maturity, the supposed arc represents an intermediate stage between continental arc and active continental margin. Thermobarometry and physical-chemical data of the parent magma as deduced from compositions of amphiboles, biotite, and plagioclase indicate crystallization temperatures of 931-825 A degrees C at pressures of 6.16-4.01 kbar and H2Omelt of 6.4-5.2 wt%. Data, as presented, argue in favor of fractional crystallization mechanism to be accounted to the present suite to interpret the observed variations. The evolution of the suite from hornblende gabbros to leuco-hornblende gabbros was accompanied by decreasing of MgO, CaO, Cr, and Ni with simultaneous increasing of Al2O3, TiO2, Na2O, K2O, Ba, Rb, Sr, La, and Ce. Residuals calculated during mass balance fractional crystallization modeling suggest that brown and green hornblendes are the main fractionated phases which derived the melt composition towards the leuco-hornblende gabbros.


英文关键词Hornblende gabbros Subduction related Calc-alkaline magma Petrogenesis
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000342486600007
WOS关键词VOLCANIC-ROCKS ; CLASSIFICATION ; PETROLOGY ; ISLANDS ; DIAGRAM ; MODEL
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/2XILL650/180802
作者单位Natl Res Ctr, Dept Geol Sci, Cairo, Egypt
推荐引用方式
GB/T 7714
Ali-Bik, Mohamed W.,Abd El Rahim, Said H.,Wahab, Wael Abdel. Hornblende gabbros of Wadi Az Zarib area, Central Eastern Desert, Egypt: opaque mineralogy, geochemistry, tectonic setting, and petrogenesis[J],2014,7(10):4009-4027.
APA Ali-Bik, Mohamed W.,Abd El Rahim, Said H.,&Wahab, Wael Abdel.(2014).Hornblende gabbros of Wadi Az Zarib area, Central Eastern Desert, Egypt: opaque mineralogy, geochemistry, tectonic setting, and petrogenesis.ARABIAN JOURNAL OF GEOSCIENCES,7(10),4009-4027.
MLA Ali-Bik, Mohamed W.,et al."Hornblende gabbros of Wadi Az Zarib area, Central Eastern Desert, Egypt: opaque mineralogy, geochemistry, tectonic setting, and petrogenesis".ARABIAN JOURNAL OF GEOSCIENCES 7.10(2014):4009-4027.
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