MICRO FACIESANALYSIS AND PALE OENVIRONMENT OF CARBONATE SEDIMENTARY ROCKS (ASMARI FORMATION) IN POSHT-DARBAND, HAMEDAN

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BABAZADEH S.A.; RAHMATI M.

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Journal: GEOSCIENCES Year:2015 | Volume:25 | Issue:97 Page(s): 123-130

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Title

MICRO FACIESANALYSIS AND PALE OENVIRONMENT OF CARBONATE SEDIMENTARY ROCKS (ASMARI FORMATION) IN POSHT-DARBAND, HAMEDAN

Author(s)

BABAZADEH S.A. | RAHMATI M. | Issue Writer Certificate

Keywords

CARBONATE SEDIMENTARY ROCKS (ASMARI FORMATION)Q2

MICROFACIESQ2

PALE OENVIRONMENTQ2

POSHTQ1

E DARBANDQ2

HAMEDANQ2

Abstract

Carbonate sedimentary rocks equivalent to Asmari Formation containing thick and thin bedded and massive limestones with a thickness of 160m studied in POSHT-Darband, Hamadan. The base of the sedimentary sequence begun with a transgressive conglomeratic horizon. This horizon is composed of rock fragments such as cherts, schists and fossiliferouslimestones which are derived from adjacent old rock units. The lower contact of conglomerate horizon overlains the metamorphic rocks and the upper contact is covered by alluvium. Based on the study of thin sections from Asmari Formation, two main facies belts containing inner and middle ramps are recognized. The inner ramp composes restricted lagoon, rotalid shoal, protected lagoon and patch reef whiles the middle ramp contains proximal, middle and distal parts respectively. Based on microscopic studies, eight MICROFACIES are presented which are consist of; 1-Large perforate foraminifera-bioclastwackestone, 2-Perforate foraminifera-red algal-bioclastpackstone/grainstone, 3-Coralgal-bioclast packstone/grainstone, 4-Coral-redalgal packstone/grainstone, 5-Imperforate foraminifera-pelloid-bioclastpackstone, 6-Rotalia grainstone, 7-Perforate-imperforate foraminifera packstone/grainstone and 8-Miliolid-bioclast-intraclast packstone. They are deposited in seven sedimentary environments. According to MICROFACIES, this formation is distributed from tidal flat to middle ramp. The Chatian (Late Oligocene) age is attributed to these carbonate rocks based on benthic foraminifera recorded.

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APA: Copy

BABAZADEH, S.A., & RAHMATI, M.. (2015). MICRO FACIESANALYSIS AND PALE OENVIRONMENT OF CARBONATE SEDIMENTARY ROCKS (ASMARI FORMATION) IN POSHT-DARBAND, HAMEDAN. GEOSCIENCES, 25(97), 123-130. SID. https://sid.ir/paper/32356/en

Vancouver: Copy

BABAZADEH S.A., RAHMATI M.. MICRO FACIESANALYSIS AND PALE OENVIRONMENT OF CARBONATE SEDIMENTARY ROCKS (ASMARI FORMATION) IN POSHT-DARBAND, HAMEDAN. GEOSCIENCES[Internet]. 2015;25(97):123-130. Available from: https://sid.ir/paper/32356/en

IEEE: Copy

S.A. BABAZADEH, and M. RAHMATI, “MICRO FACIESANALYSIS AND PALE OENVIRONMENT OF CARBONATE SEDIMENTARY ROCKS (ASMARI FORMATION) IN POSHT-DARBAND, HAMEDAN,” GEOSCIENCES, vol. 25, no. 97, pp. 123–130, 2015, [Online]. Available: https://sid.ir/paper/32356/en

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