The Role of Clay Minerals in Interpreting Climatic Conditions and Diagenesis of the Amiran Formation (Upper Maastrichtian–Paleocene), Southwestern Lorestan

Articles in Press

Document Type : Original Article

Authors

1 Assist. Prof., Department of Geology, Faculty of Sciences, University of Gonabad, Gonabad, Iran

2 Assistant Professor of Stratigraphy, Department of Biology, Faculty of Sciences, University of Maragheh, Maragheh, Iran.

10.22128/ijcm.2026.3081.1014

Abstract

The Amiran Formation with the age of Upper Maastrichtian - Paleocene is spread of in Lorestan region, Zagros sedimentary basin. The purpose of this research is to investigate the clay minerals for interpreting climatic conditions and the history of burial diagenesis of the Amiran Formation in southwest of Lorestan based on XRD، SEM and petrographic studies. In this regard, a stratigraphic section (Pirshamsoddin section) has been measured and sampled. The thickness of this section is 920 meters. The lower boundary of this formation is gradual with Gurpi Formation and its upper boundary with Kashkan Formation is erosion. XRD analysis has identified the minerals illite, muscovite, paragonite, palygorskite, nantronite, margarite, montmorillonite, and chlorite. Illite and chlorite are the most abundant clay minerals. The diagenetic processes affecting siliciclastic rocks include cementation, compaction, Dissolution and replacement. Chemical processes, such as the formation of stylolites, are also notable.

Keywords

Iranian Journal of Crystallography and Mineralogy

Articles in Press, Accepted Manuscript
Available Online from 28 January 2026

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History

  • Receive Date: 02 October 2025
  • Revise Date: 21 January 2026
  • Accept Date: 28 January 2026

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