Cretaceous environments of Afghanistan: a synthesis based on selected sections

Ashraf, Abdul Rahman ; Sahni, Ashok (2003) Cretaceous environments of Afghanistan: a synthesis based on selected sections Journal Of Geoscientific Research In Northern Asia, 6 (1). pp. 5-59. ISSN 1008-0503

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Abstract

The Cretaceous of Afghanistan is marked by great facies diversity. The evolution of Cretaceous basins is part of a complex accretionary history involving three distinct tectonic units namely the Asian (Russian) Block separated from the Indian plate by a rather well defined transcurrent fault (Chaman- Nuski). The southwestern component is representedby the Iran-Afghanistan plate. The Lower Cretaceous of the Asian Block is represented by the Red-Grit Series which isconformable to the underlying Upper Jurassic sequences. The transition is marked by evaporitic facies dominated by salt, gypsum and marl deposits. In south Afghanistan volcanic rocks occur at Farah, with the emplacement of plutonics inwest-central Afghanistan. The Upper Cretaceous of north Afghanistan is marked by richly fossiliferous, lime stone-dominated sequences. The Upper Cretaceous of southern Afghanistan is marked by strong ophiolitic magrmatism.

Item Type:Article
Source:Copyright of this article belongs to Changchun University of Science and Technology.
Keywords:Cretaceous; Afghanistan; Biostratigraphy; Palynology
ID Code:87442
Deposited On:19 Mar 2012 06:41
Last Modified:19 Mar 2012 06:41

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