The relation between glauconitization and calcite cementation with the relative sea level changes in the mixed silisiclastic- carbonate sediments of Aitamir Formation (Mid-Cretaceous), Kopet-Dagh basin

Authors

1 Ph.D. Student Ferdowsi University of Mashhad

2 Professor, Department of Geology, Ferdowsi University of Mashhad

Abstract

Two diagenetic processes of glauconitization and calcite cementation and relation those to sea level changes in the siliciclastic-carbonate sediments of the Aitamir Formation (Albian-Cenomanian) in Kopet-Dagh basin have studied. The lower sandstone unit consists of mainly sandstone intercalated with shale and limestone and the upper shale units are two major sediments of this formation. The sandstone of the lower unit based on composition and their relations with sea level change subdivided into two transgressive and regressive facies and in this relation, show different pathways of the diagenesis. In the transgressive facies display by high content of the shell remains, with development in diagenesis shows extensive cementation and a little compaction during burial stage.  In the regressive sandstone, characterized by little skeletal elements, display little calcite cements and high burial compaction. The glauconitic grains and calcite cementation in the Aitamir Formation concentrated in the transgressive facies and especially in the maximum flooding surface and transgresive surface. Whereas, in the regressive facies the glauconitic grains and calcite cementation is principally low. Moreover, the transgressive system tract and maximum flooding surface is characterized by mature and high mature glauconitic grains.    
 

Keywords

References

 
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Journal of Stratigraphy and Sedimentology Researches
Volume 28, Issue 3 - Serial Number 3
November 2012
Pages 19-36

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