Document Details

Document Type : Article In Journal 
Document Title :
Outcrop-Subcrop Sequence and Diagenesis of Upper Jurassic Arab-Hith Formations, Central Saudi Arabia
التتابع السطحي ـ تحت السطحي وعمليات النشأة المتأخرة لمتكوني العرب ـ الهيت ( الجوراسي العلوي ) في وسط المملكة العربية السعودية
 
Subject : Earth Sciences 
Document Language : English 
Abstract : Outcrop-subcrop of the Upper Jurassic Arab-Hith Forma- f tions in central Saudi Arabia were studied in detail. The Arab Formation is t mostly poorly exposed owing to the extensive slumping, collapsing and i brecciation resulted from the dissolution of the interbedded anhydrite units. Except for an excellent exposure at Dahl Hit and limited exposurest o :I the east of AI-Hair and Al-Badi (Fig. 3),. the Hith outcro~ had been re- I moved totally by underground water solutIon of the anhydnte. 1 A composite stratigraphic sequence of the Arab and Hith was established I: fro~ the outcrop-subc~o~ relationship. Fo.ur carbonate u~its have been recogrnzed; the basal UnIt IS generally persIstent and undIsturbed, whereas .' three other units are mostly made of slumped, contorted and fractured 1, limestones as well as of brecciated limestone. While most of the coarse- I grained limestone of the Arab in the outcropping area underwent leaching t and recrystallization, the rocks in the subcrop were leached, recrystallized I anddolomitized. 1 Dissolution of the Arab- Hith anhydrite units has caused serious geotech- Ii nical problems such as slumping, brecciation, cavities, vugs and fractures of I the rocks in the outcrop-subcrop areas. Presence of vertical fractures and .J po~sible presence of permeability barriers to the east of the Sulaiy (Lower r Cretaceous) escarpment seem to have caused the rise of the underground water table in the Riyadh area, which may further introduce potential health hazards by vertical charging of the sewage water into the underlying Riyadh Aquifer. 
ISSN : 1012-8832 
Journal Name : Earth Sciences Journal 
Volume : 4 
Issue Number : 1 
Publishing Year : 1411 AH
1991 AD 
Number Of Pages : 31 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
فاروق شريف FAROOQ A. SHARIEFResearcher  
محمد خان MOHAMMED S. KHANResearcher  
كنجي ماجارا KINJI MAGARAResearcher  

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