A new insight of stratigraphic column, facies variation, and sedimentary environment of the Shemshak group in Parvar-Kavard section, NE Semnan, Iran

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HOSEINI H.; Kohansal Ghadimvad N.; Zamani Pedram M.; MAJIDIFARD M.R.; SHAHIDI A.R.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:110 Page(s): 287-298

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Title

A new insight of stratigraphic column, facies variation, and sedimentary environment of the Shemshak group in Parvar-Kavard section, NE Semnan, Iran

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Keywords

ShemshakQ2

Sedimentary environmentQ2

FacieceQ2

SubfacieceQ1

Abstract

Accumulation of Shemshak group lithofacies have been started during Early-Cimmerian orogeny from middle of Late-Triassic and ended with Middle-Cimmerian discontinuity dating Millde-Jurrasic. So the mostly Siliciclastic and occasionally Marin lithostratigraphic unite has evidences of two major tectonic events as orogenic activity at lower and upper border of sequence. Therefor the lower contact of Shemshak group is composed of Middle-Triassic platform carbonates known as Elika formation which distinguished with Plaeokarsts including bauxit and laterit horizons and the upper contact with parallel unconformity with Delichay formation fossiliferous marls and carbonates of Bajocian stage (Middle Jurrasic). Results of deposition environment and facies studies have shown that the mentioned siliciclastic group (Shemshak) composed of three major facies, 22 subfacies and have been deposited in three different environments including Fluvial (Terrestrial), mid-tidal and shallow marine environments. The vertical changes of facies have declared that the sequence has formed due to erosion of Early-Cimmerian uplands and have experienced progess of shallow marine. The existing shallow marine sediments in the end of Shemshak group states that, in comparison with surrounding area, clastic sediments of end of Shemshak cycle, because of erosional cycles of Middle-Cimmerian orogeny, befor deposition of Delichay marine formation, have been eroded.

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APA: Copy

HOSEINI, H., Kohansal Ghadimvad, N., Zamani Pedram, M., MAJIDIFARD, M.R., & SHAHIDI, A.R.. (2019). A new insight of stratigraphic column, facies variation, and sedimentary environment of the Shemshak group in Parvar-Kavard section, NE Semnan, Iran. GEOSCIENCES, 28(110 ), 287-298. SID. https://sid.ir/paper/32124/en

Vancouver: Copy

HOSEINI H., Kohansal Ghadimvad N., Zamani Pedram M., MAJIDIFARD M.R., SHAHIDI A.R.. A new insight of stratigraphic column, facies variation, and sedimentary environment of the Shemshak group in Parvar-Kavard section, NE Semnan, Iran. GEOSCIENCES[Internet]. 2019;28(110 ):287-298. Available from: https://sid.ir/paper/32124/en

IEEE: Copy

H. HOSEINI, N. Kohansal Ghadimvad, M. Zamani Pedram, M.R. MAJIDIFARD, and A.R. SHAHIDI, “A new insight of stratigraphic column, facies variation, and sedimentary environment of the Shemshak group in Parvar-Kavard section, NE Semnan, Iran,” GEOSCIENCES, vol. 28, no. 110 , pp. 287–298, 2019, [Online]. Available: https://sid.ir/paper/32124/en

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