Document Details

Document Type : Article In Journal 
Document Title :
Selective Dolomitization in Arabian Carbonate Rocks
عملية الدلمتة الاختيارية في الصخور الكربوناتية العربية
 
Subject : Earth Sciences 
Document Language : English 
Abstract : Selective dolomitization is a distinctive petrographic feature observed in the Upper Permian Khuff and Upper Jurassic Jubaila and upper Hanifa carbonate rocks exposed in Central Saudi Arabia. In broader terms, an intimate affinity exists between dolomite replacement and original micrite matrix in the limestone, so that the former steadily increases with the increased abundance of the latter. In closer terms, however, each one of the carbonate constituents in limestone (micrite matrix, allochems and sparry calcite cement) has shown variable susceptibility to dolomite replacement. In general, the Khuff and Jubaila limestones were differently affected by dolomitization in both intensiveness and texture of the replacin~ dolomite. The original depositional constituents of the Khuff rocks were usually affected by complete (indiscriminate) dolomitization resulting in extremely fine-textured dolomite, whereas those of the Jubaila and adjacent rocks were affected by partial (selective) or complete dolomitization resulting in coarser-textured dolomite. It seems that the general contrast in apparent dolomite behaviour in the examined rocks is mainly attributed to whether dolomitization occurred earlier or later than the diagenetic cementation of carbonate sediments. Subsequently, early and late phases of dolomitization might be envisaged to have respectively antedated and postdated the neomorphic transformation of carbonate sediments from aragonite into calcite. Seli:ctive dolomitization could be explained in the light of certain factors which may separately or collectively influence the dolomite replacement of each carbonate constituent. The three main factors are: pre-dolomitization minenalogy, grain size and permeability of the original calcium carbonate sediments and rocks. A general order for the sequence of variable susceptibility to dolomitization of the various carbonate constituents is established for the examined rocks. 
ISSN : 1012-8832 
Journal Name : Earth Sciences Journal 
Volume : 8 
Issue Number : 1 
Publishing Year : 1415 AH
1995 AD 
Number Of Pages : 13 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
رشاد حسن زيدان RASHAD H. ZEIDANResearcher  

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