Arid
DOI10.1007/s12517-013-1182-0
Neoproterozoic granites of Sharm El-Sheikh area, Egypt: mineralogical and thermobarometric variations
Ghoneim, Mohamed F.1; Heikal, Mohamed Th. S.1; El Dosuky, Bothina T.1; Abu-Alam, Tamer S.1,2,3; Sherif, Mahmoud I.1
通讯作者Ghoneim, Mohamed F.
来源期刊ARABIAN JOURNAL OF GEOSCIENCES
ISSN1866-7511
EISSN1866-7538
出版年2015
卷号8期号:1页码:125-141
英文摘要

Calc-alkaline and alkaline intrusions of the late Neoproterozic form essential part of the Arabian-Nubian Shield. They were formed during the collision between East-and West-Gondwana. Sharm El-Sheikh area, Sinai, includes wide compositional array of these intrusions that can be considered as a case study. Variations in both tectonic and thermobarometric condition for granitic intrusions are studied. Four mappable granitic types are recognized namely monzogranite, syenogranite, alkali feldspar granites, and riebeckite-bearing granites. The monzogranite and the syenogranite of the study area are mostly I-type, whereas the alkali feldspar granite and the riebeckite-bearing granite belong to A-type granitoid. The calc-alkaline intrusions were formed in compressional setting due to decompressional melting of mafic lower crust. Partial melting and anatexing of crustal rocks are suggested to explain the protolith of the alkaline intrusions. The transition from the calc-alkaline magma to the alkaline one occurred as a result of the tectonic transition from compression regime to tectonic relaxation (extension setting) during the last stage of the Pan-African Orogeny. The amphiboles of the studied granites are classified as calcic-and alkali-amphiboles. The calcic-amphiboles are ferro-edenite while the alkali-amphiboles are typically riebeckite. Both amphibole types are of magmatic nature. Coexisting amphiboles and plagioclases are used to estimate the physicochemical parameters of magma crystallization. The syenogranite underwent temperature and pressure of formation range of 520-730 degrees C, <3 kbar. The alkali feldspar granite records 450-830 degrees C, <4 kbar, while the riebeckite-bearing granite records the lowest temperature condition among all varieties and estimate formation at 350-650 degrees C, <4 kbar.


英文关键词Compression-extension transition tectonic Sharm El-Sheikh South Sinai Mineral chemistry Riebeckite Physicochemical
类型Article
语种英语
国家Egypt ; Austria
收录类别SCI-E
WOS记录号WOS:000348108300010
WOS关键词ARABIAN-NUBIAN-SHIELD ; A-TYPE GRANITES ; CENTRAL EASTERN DESERT ; CRUSTAL EVOLUTION ; SOUTHERN ISRAEL ; POSTCOLLISIONAL MAGMATISM ; EXTENSIONAL COLLAPSE ; SINAI PENINSULA ; CALC-ALKALINE ; SOLAF REGION
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/2XILL650/185863
作者单位1.Tanta Univ, Dept Geol, Fac Sci, Tanta 31527, Egypt;
2.Graz Univ, Inst Erdwissensch, A-8010 Graz, Austria;
3.Egyptian Inst Geodynam, Cairo, Egypt
推荐引用方式
GB/T 7714
Ghoneim, Mohamed F.,Heikal, Mohamed Th. S.,El Dosuky, Bothina T.,et al. Neoproterozoic granites of Sharm El-Sheikh area, Egypt: mineralogical and thermobarometric variations[J],2015,8(1):125-141.
APA Ghoneim, Mohamed F.,Heikal, Mohamed Th. S.,El Dosuky, Bothina T.,Abu-Alam, Tamer S.,&Sherif, Mahmoud I..(2015).Neoproterozoic granites of Sharm El-Sheikh area, Egypt: mineralogical and thermobarometric variations.ARABIAN JOURNAL OF GEOSCIENCES,8(1),125-141.
MLA Ghoneim, Mohamed F.,et al."Neoproterozoic granites of Sharm El-Sheikh area, Egypt: mineralogical and thermobarometric variations".ARABIAN JOURNAL OF GEOSCIENCES 8.1(2015):125-141.
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