Document Details

Document Type : Article In Journal 
Document Title :
Age and Petrochemistry of Bahrah Granodiorite-Granite Complex, Jeddah-Makkah Region, Saudi Arabia
عمر وكيمياء الخصر لمعقد بحرة من الجرانوديوريت ـ جرانيت بمنطقة جدة ـ مكة ـ المملكة العربية السعودية
 
Subject : Earth Sciences 
Document Language : English 
Abstract : The Bahrah granodiorite-granite complex is an oval intrusion oriented NE-SW forming a negative geomorphologic feature at the intersection of Wadi Fatima to the west and Wadi AI-Shumaysi to the east. It is bound to the west by leddah group metavolcanics and Bahah group paraschist. To the east, it is in contact with leddah group metavolcanics and intruded quartz-diorites. The complex is traversed by fine grained basic dikes trending E- W .! The rock types range from gabbroic to granitic. The main rock type is medium to coarse grained biotite and sometimes biotite-hornblende granite. The quartz-diorite and granodiorite facies near the eastern borders of the complex are slightly foliated and contain abundant mafic xenoliths, indicating an emplacement mechanism by stoping. . The intrusion is peraluminous calc-alkaline in nature and highly depleted in LIL-elements suggesting a subduction related origin of the magma. The Rb/Sr age obtained is 665 :!: 12 Ma, and is interpreted as the age of emplacement during post-Fatima group time whose age is 690-680 Ma. This is the time-equivalent of the post-Halaban-Hulayfah tectono-plutonic cycle widely spread in the Arabian Shield. 
ISSN : 1012-8832 
Journal Name : Earth Sciences Journal 
Volume : 2 
Issue Number : 1 
Publishing Year : 1409 AH
1989 AD 
Number Of Pages : 20 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عبدالعزيز رادين A. A. RADAINResearcher  
أحمد الشنطي A. M. S. AL-SHANTIResearcher  
عبدالله عبدالمنعم A. A. ABDEL-MONEMResearcher  

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