Document Details

Document Type : Article In Journal 
Document Title :
Geochronology and Geochemical Evolution of the Wadi Turabah Felsic Plutonic Ring Complex, Central Arabian Shield
التاريخ الجيولوجي والتطور الجيوكيميائي لمعقد وادي تربة الفلسي السحيقي الحقلي ، وسط الدرع العربي
 
Subject : Earth Sciences 
Document Language : English 
Abstract : Rb-Sr whole rock isochrons and major element oxide data for the Wadi Turabah felsic plutonic ring complex are discussed. Felsic rocks of the Wadi Turabah ring structure indicate a complex history of evolution and consist of gneissic granodiorite-granite suite (GGGS), massive granodiorite- granite suite (MGGS), and a ring dike granite. The GGGS and north trending metavolcanic and metasedimentary layered sequences (classified as Baish and Bahah) have suffered polyphase deformation and metamorphism in the upper and lower grades of the greenschist and amphibolite facies, respectively. The ring dike granite is the last phase in the magmatic evolution of the ring complex. Rb-Sr whole rock data for six samples of the GGGS defines an apparent age of 535±11 Ma (2<1) with an initial 87SrJ86Sr ratio ofO.7037±0.OOOI6 (2<1) and a MSWD (mean square of weighted deviates) value of 6.6. The age determined on five samplesofMGGS is 416±9 Ma (2<1) with an initial 87Sr186Sr ratio of 0.704±0.OOO2 (2<1) and a MSWD value of 9.01. The ring dike granite yields a four point isochron age of 117±OA Ma with an initial 87Sr186Sr ratio of 0.7089±0.OOOI5 (2<1) and a MSWD value of 0.01. Major element oxide and Rb-Sr data indicate that the felsic plutonic rocks within the ring structure are highly differentiated and derived from fractional crystallization of magma generated from the lower crust or upper mantle. The chemical data also indicate that the ring dike granite is fractionated from magma of ternary minimum composition in the system Si0zNaAISi04- KAISi04 under water pressure of 1 Kb. 
ISSN : 1012-8832 
Journal Name : Earth Sciences Journal 
Volume : 1 
Issue Number : 1 
Publishing Year : 1408 AH
1988 AD 
Number Of Pages : 24 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عبدالعزيز رادين A. A. RADAINResearcher  
سيد علي S. ALIResearcher  
عبدالله عبدالمنعم A. A. ABDELMONEMResearcher  

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