BIOSTRATIGRAPHY AND PALAEOECOLOGY OF QOM FORMATION IN GHOHRUD AREA (SOUTH OF KASHAN)

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DEHGHAN R.; SAFARI A.

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Journal: SEDIMENTARY FACIES Year:2011 | Volume:4 | Issue:1 Page(s): 40-53

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Title

BIOSTRATIGRAPHY AND PALAEOECOLOGY OF QOM FORMATION IN GHOHRUD AREA (SOUTH OF KASHAN)

Author(s)

DEHGHAN R. | SAFARI A. | Issue Writer Certificate

Keywords

QOM FORMATIONQ2

BIOSTRATIGRAPHYQ2

FORAMINIFERAQ2

PALEOECOLOGYQ2

GHOHRUD AREAQ2

Abstract

The QOM FORMATION in GHOHRUD AREA has been investigated in order to determine its BIOSTRATIGRAPHY and palaeoecology. The thickness of QOM FORMATION is about 325 meters at the study area and consists of thin, medium to thick bedded and massive limestones.They underline on Eocene volcanic with disconformity and it covers by alluvium deposits. Based on this study, 14 genera and 26 species of the benthic FORAMINIFERA were identified. The ssemblage of benthic FORAMINIFERA represents the Late Oligocene (Chattian) to Early Miocene (Aqitanian?) age. Large benthic FORAMINIFERA with thin hyaline wall such as large lepidocyclinidae and nummulitidae with symbiotic bearing algae are present. This is due to increase in water depth, low energy, normal salinity and prevailing of a deeper open marine environment. In shallower open marine environment, foraminifers wall (with hyaline wall) become thicker and smaller in size that represents decrease in water depth, and increase in light and energy. In this section, semi-restricted lagoon FORAMINIFERA with porcelaneous wall and FORAMINIFERA with hyaline wall are present together. In shallow water (restricted lagoon) FORAMINIFERA with porcelaneous wall such as Austrotirillina, Borellis, Miliolids and peneroplis are present, that reveals decrease of water depth and increase in light and salinity factors.

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APA: Copy

DEHGHAN, R., & SAFARI, A.. (2011). BIOSTRATIGRAPHY AND PALAEOECOLOGY OF QOM FORMATION IN GHOHRUD AREA (SOUTH OF KASHAN). SEDIMENTARY FACIES, 4(1), 40-53. SID. https://sid.ir/paper/199853/en

Vancouver: Copy

DEHGHAN R., SAFARI A.. BIOSTRATIGRAPHY AND PALAEOECOLOGY OF QOM FORMATION IN GHOHRUD AREA (SOUTH OF KASHAN). SEDIMENTARY FACIES[Internet]. 2011;4(1):40-53. Available from: https://sid.ir/paper/199853/en

IEEE: Copy

R. DEHGHAN, and A. SAFARI, “BIOSTRATIGRAPHY AND PALAEOECOLOGY OF QOM FORMATION IN GHOHRUD AREA (SOUTH OF KASHAN),” SEDIMENTARY FACIES, vol. 4, no. 1, pp. 40–53, 2011, [Online]. Available: https://sid.ir/paper/199853/en

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