Depositional model, diagenesis and geochemistry of the SefidKuh Formation (Late Scythian) in AgheDarband tectonic window, NE of Iran

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LIAGHAT M.; ADABI M.H.

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Journal: Researches in Earth Sciences Year:2018 | Volume:9 | Issue:34 Page(s): 0-0

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Title

Depositional model, diagenesis and geochemistry of the SefidKuh Formation (Late Scythian) in AgheDarband tectonic window, NE of Iran

Author(s)

LIAGHAT M. | ADABI M.H. | Issue Writer Certificate

Keywords

AghdarbandQ2

DiagenesisQ2

GeochemistryQ2

SefidKuh FormationQ1

Depositional modelQ2

Abstract

Shallow marine carbonates sedimentation prevailed during the Early Triassic in the NE of Iran (SefidKuh Formation; Aghdarband tectonic window). This formation with the age of Late Schythian overlies the QaraGheithan Formation unconformably and also unconformably covered by the Nazarkardeh Formation in the type section. To evaluate the Depositional model, original carbonate mineralogy and diagenetic processes, this study investigated by petrographic and geochemical analyses in the Kale Faqir, Kale Angur, Kale Ghalk and Kale Anabehsctions with 250m, 75m, 70m, 30m thickness, respectiveley. Petrographic studies led to the recognition of 12 microfacies that were deposited in four facies belts: tidal flat, lagoon, and shoal in inner ramp and open marine in mid to outer ramp environments. The wide distribution of tidal flat sediments along with the oolitic shoal facies and the lack of a large shoal reef and also calciturbidite deposites indicate a homoclinal-ramp system. Abundant skeletal aragonite and non-skeletal components, aragonite cements, oomold and presence of dolomites as well as high Sr elemental concenteration in the SefidKuh carbonates indicate original aragonite carbonate mineralogy. Cementation, dolomitization, dedolomitization, micritization, bioturbation, hematitization, compaction, dissolution, vein filling, phosphatitization, pyritization and stylolitization are diagenetic processes in the SefidKuh Formation. Cementation and dolomitization are the main diagenetic processes that affected the SefidKuh deposits. Values of major (Ca and Mg) and minor (Sr, Na, Fe and Mn) elements (such as high Sr value) indicated that the SefidKuh carbonates were deposited in a shallow warm-water subtropical environment and aragonite was the original carbonate mineralogy. Variations of Sr/Ca suggest that diagenetic alteration must have occurred in close to open diagenetic system, with high water/rock interaction, that dolomitization, dissolution and cementation support this conclusion by petrographic studies.

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APA: Copy

LIAGHAT, M., & ADABI, M.H.. (2018). Depositional model, diagenesis and geochemistry of the SefidKuh Formation (Late Scythian) in AgheDarband tectonic window, NE of Iran. RESEARCHES IN EARTH SCIENCES, 9(34 ), 0-0. SID. https://sid.ir/paper/369221/en

Vancouver: Copy

LIAGHAT M., ADABI M.H.. Depositional model, diagenesis and geochemistry of the SefidKuh Formation (Late Scythian) in AgheDarband tectonic window, NE of Iran. RESEARCHES IN EARTH SCIENCES[Internet]. 2018;9(34 ):0-0. Available from: https://sid.ir/paper/369221/en

IEEE: Copy

M. LIAGHAT, and M.H. ADABI, “Depositional model, diagenesis and geochemistry of the SefidKuh Formation (Late Scythian) in AgheDarband tectonic window, NE of Iran,” RESEARCHES IN EARTH SCIENCES, vol. 9, no. 34 , pp. 0–0, 2018, [Online]. Available: https://sid.ir/paper/369221/en

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