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Coal petrology,sedimentology and depositional environment of the Parvadeh coais in the Upper Triassic,tabas block of Central-East Iran

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International Journal of Coal Science & Technology 2023年第3期10卷 58-77页

作者： Ziba Zamani Hossain Rahimpour-Bonab Ralf Littke School of Geology College of ScienceUniversity of TehranTehranIran Energy and Mineral Resources(EMR) RWTH Aachen UniversityAachenGermany

Peat forming environment strongly influences the economic value of any coal seam and coal-bearing ***,pal-aeoenvironmental studies provide important information for coal resource *** this context,detailed studies on selected coals from the Parvadeh Area,Iran,were conducted using sedimentology,coal petrology,X-ray diffraction(XRD),scanning electron microscopy-energy dispersive X-ray analyzer(SEM-EDX),and proximate *** sedi-mentary facies above and below the coal seams are mainly marine or marine-influenced facies,supporting that the coal-forming mires in the Parvadeh Area developed in a paralic environment,where the base level must be closely related to sea *** contents are moderate to high and mark the influence of brackish/marine water,especially during transgres-sion after peat growth in a lower delta plain *** peat-forming mires extended on coastal/delta plain *** lower delta plain/coastal plain coals are characterized by lateral continuity and substantial thickness,whereas few coals possibly representing the upper delta plain are thin and more *** detrital nature and composition of the numerous partings and the overall high ash yield in the coal seams indicate an active tectonic area with high rates of creation of accommodation space over peat *** petrology and coal facies analysis exhibits a permanently high water table within a forest swamp and mostly rheotrophic conditions,sometimes with connection to the ***-ing to paleoenvironmental reconstructions,it seems that coal layers may be thicker,with less sulfur(pyrite),but more clastic minerals and partings toward the western part of the *** these coal seams presently have low economic potential for the mining operation,partly due to great depth,this humic,high-volatile to medium-volatile bituminous coal may be suitable for exploration of coal bed methane resources.

关键词： Coal petrology Sedimentology Coal facies analysis Upper Triassic Nayband Formation tabas block

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Depositional environments and sequence stratigraphy of the Bahram Formation(middleelate Devonian) in north of Kerman, south-central Iran

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Geoscience Frontiers 2016年第5期7卷 821-834页

作者： Afshin Hashmie Ali Rostamnejad Fariba Nikbakht Mansour Ghorbanie Peyman Rezaie Hossien Gholamalian Department of Geology Faculty of Sciences University of Hormozgan

This study is focused on sedimentary environments, facies distribution, and sequence stratigraphy. The facies and sequence stratigraphic analyses of the Bahram Formation（middleelate Devonian） in southcentral Iran are based on two measured stratigraphic sections in the southern tabas block. The Bahram Formation overlies red sandstones Padeha Formation in sections Hutk and Sardar and is overlain by Carboniferous carbonate deposits of Hutk Formation paraconformably, with a thickness of 354 and386 m respectively. Mixed siliciclastic and carbonate sediments are present in this succession. The field observations and laboratory studies were used to identify 14 micro/petrofacies, which can be grouped into 5 depositional environments： shore, tidal flat, lagoon, shoal and shallow open marine. A mixed carbonate-detrital shallow shelf is suggested for the depositional environment of the Bahram Formation which deepens to the east（Sardar section） and thins in southern locations（Hutk section）. Three 3rdorder cyclic siliciclastic and carbonate sequences in the Bahram Formation and one sequence shared with the overlying joint with Hutk Formation are identified, on the basis of shallowing upward patterns in the micro/pertofacies.

关键词： Bahram Formation Devonian Facies analysis Mixed carbonate-detrital shallow-shelf Sequence stratigraphy tabas block

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