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International Journal of Scientific and Engineering Research
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ISSN Print: 2229-5518 7    
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scirp IJSER >> Volume 2, Issue 7, July 2011 Edition
Depositional and Diagenetic History of the Neoproterozoic Silicified Stromatolitic Carbonates, West of Wadi Girshah, Ablah District, Western Arabian Shield, Saudi Arabia
Full Text(PDF, 3000)  PP.  
Taj, R. J., Mesaed, A. A.
Arabian Shield stromatolites, Asir Terrain, Ablah area, Wadi Raniyah, Wadi Girshah, Precambrian stromatolitic carbonates, basic tuffs.
The Neoproterozoic stromatolitic carbonates of wadi Girshah, Saudi Arabia, is present in the middle part of the volcano-sedimentary succession of Ablah Group in Asir terrain. This succession is composed from rhythmic alternations of basic and acidic volcanic and related volcaniclastics with subordinated dolostones. It represents a shallow marine/non marine facies related to basic and acidic edifices during intermittent periods of volcanism, tectonism and sedimentation. The stromatolitic carbonates are present in the middle and topmost part of small-scale cycles begins by black tuffaceous mudstone which becomes upward slightly to highly dolomitized and/or calcitized giving-rise to black carbonate beds. The stromatolitic carbonate beds represent short-lived periods of cessation of volcanism and related volcanicalstic sedimentation. During these periods, the deposited basic tuffs become subjected to syn-sedimentary and diagenetic alterations leading to the formation of the carbonate beds.
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