Facies Analysis, Sedimentary Environment and Sequence Stratigraphy of the Carboniferous Deposits of Gachal Formation, Eastern Central Iran Rahdar SectionReportar como inadecuado




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Early carboniferousdeposits of the Kalmard block, with various characteristics in differentoutcrops, are recognized by Gachal Formation. Generally speaking, thisformation comprises of four different members A, B, C and D, consisting ofcarbonate and evaporative rocks. Gachal Formation is composed chiefly of 55meters sandstone and limestone interbedded with shale. According to thelithological and microscopic studies, Gachal Formation is deposited in beach,semi-restricted and open lagoon, shoal and open marine environments. Verticalchanges of microfacies and the curve of its depth changes account for the highthickness of the facies of shoal and bar sub-environments and the low thicknessof the facies of lagoon and open marine sub-environment as well. GachalFormation rocks in Rahdar section are deposited in a low-angle homoclinal ramp located in southern Paleothysis Ocean.The carbonate-sandstone sequence in GachalFormation in Rahdar section is composed of a depositional sequence separatedfrom each other by type 1 sequence boundaries. Deposits of this formation areseparated from lower deposits by type 2 sequence boundary and from Khan Group by unconformity. Thesedimentary sequence identified in this formation points to the age of lateVisean, conforming to Kaskaskia IV. The erosional boundary between Gachal andKhan Formations is relatively compatible with drop in sea level at LateKaskaskia global scale.

KEYWORDS

Kalmard, Lower Carboniferous, Gachal Formation, Rahdar Section, Homoclinal, Paleothysis, Kaskaskia, Khan Group

Cite this paper

Javdan, M. , Gorgij, M. , Shahraki, J. , Hashemi, S. , Kalvandi, S. , Kalvandi, S. and Bandani, E. 2015 Facies Analysis, Sedimentary Environment and Sequence Stratigraphy of the Carboniferous Deposits of Gachal Formation, Eastern Central Iran Rahdar Section. Open Journal of Geology, 5, 623-636. doi: 10.4236-ojg.2015.59055.





Autor: Mohammad Javad Javdan1, Mohammad Nabi Gorgij2, Javad Shahraki3*, Seyed Mahmood Pahlavan Hashemi3, Seyed Mohsen Kalvandi3, Seyed M

Fuente: http://www.scirp.org/



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