| Cretaceous Environments of Afghanistan:A Synthesis Based on Selected Sections |
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| 作者姓名： | Abdul Rahman Ashraf Ashok Sahni |
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| 作者单位： | Institute of Geosciences，University of Tuebingen，Centre of Advanced Study in Geology，Panjab University Tuebingen，D-72076 Germany，Chandigarh，160014 India |
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| 摘 要： | 1IntroductionThe Late Mesozoic sequences of Afghanistan are important in understanding the geodynamic evolu-tion of the northwestern part of South Asia, in par-ticular the transgressive and regressive history of the northwestern part of the Tethys connecting Iran to the west and the northern Indian Subcontinent to the east. Jurassic to Upper Cretaceous sedimentary seque-nces were initially studied by Griesbach (1885 ~1887) and Hayden (1880~1901) through several traverses in northern an…
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Cretaceous Environments of Afghanistan:A Synthesis Based on Selected Sections |
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| Abdul Rahman Ashraf,Ashok Sahni.Cretaceous Environments of Afghanistan:A Synthesis Based on Selected Sections[J].Journal of Geoscientific Research in Northeast Asia,2003(1). |
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| Authors: | Abdul Rahman Ashraf Ashok Sahni |
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| Institution: | Abdul Rahman Ashraf 1,Ashok Sahni 2 1.Institute of Geosciences,University of Tuebingen,Tuebingen,D-72076Germany2.Centre of Advanced Study in Geology,Panjab University,Chandigarh,160014India |
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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 represented by the Iran-Afghanistan plate. The Lower Cretaceous of the Asian Block is represented by the Red-Grit Series which is conformable 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 in west-central Afghanistan. The Upper Cretaceous of north Afghanistan is marked by richly fossiliferous, limestone-domi-nated sequences. The Upper Cretaceous of southern Afghanistan is marked by strong ophiolitic magmatism. |
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| Keywords: | Cretaceous Afghanistan biostratigraphy palynology |
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