Z Solaymani; N Taghipour; R Aharipour
Abstract
This study investigates the organic petrographic of the upper Triassic to Lower Jurassic Olang coal deposits. Olang area is located in 70 km of northeast Shahroud. This area is situated in Gheshlagh Olang synclinal which is a member of eastern Alborz coal basin. Microscopic studies showed that all three ...
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This study investigates the organic petrographic of the upper Triassic to Lower Jurassic Olang coal deposits. Olang area is located in 70 km of northeast Shahroud. This area is situated in Gheshlagh Olang synclinal which is a member of eastern Alborz coal basin. Microscopic studies showed that all three maceral groups of vitrinite, inertinite and liptinite presented in coal deposits of the Olang region and the vitrinite is most important maceral group in these coals. Macerals of vitrinite group include colotelinite, collodetrinite and corpogelinit that collodetrinite is the most abundant of maceral in coal deposits. All of inertinite macerals group observed in these coals which Semifusinite and fusinite are the most abundant in this group. Spornite, cutinite, resinite and lipthodetrinite macerals of liptinite group are present in the coals. Abundance of collodetrinite, presentation of fnginite and the absence of tellinite in these coals are usually thought to indicate deposition in neutral to weakly alkaline waters in an oxygen-rich environment.
P. Navi; M. Yazdi; R. Esmailpur; A. Khakzad
Abstract
Lavij coal deposit is situated at a distance of 48 km SW of Amol, in Central Alborz coalfield, North of Iran. Lavij coal-bearing strata in Central Alborz zone are within the Upper Triassic– Lower Jurassic formation. The coal-bearing sediments in this area are called Shemshak Formation ...
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Lavij coal deposit is situated at a distance of 48 km SW of Amol, in Central Alborz coalfield, North of Iran. Lavij coal-bearing strata in Central Alborz zone are within the Upper Triassic– Lower Jurassic formation. The coal-bearing sediments in this area are called Shemshak Formation (Upper Triassic –Lower Jurassic). This Formation consists mainly of sandstone, shale, calcareous sandstone, argillite and siltstone. Several coal seams with different thickness are interbeded with these sediments. The Shemshak Formation is underlain by the Upper Middle Triassic (thick bedded to massive dolomitic limestone) oolitic limestone (Elika Formation). It is also overlain in western section by the Upper Permian cherty limestone (Nesen Formation). The present paper deals with maceral, mineral and geochemical composition of these coals. Petrographical studies showed that the main macerals of these coals are vitrinite to semivitrinite, fusinite and exinite. The minerals of these coals are mainly clays like argillite, carbonates like calcite and sulphides like pyrite.
Seven samples were analyzed from ash of coal seam in the Lavij area. The samples were analyzed by XRF and ICP-OES for major and minor elements. The data processing showed K, Si, Al, Ti indicating presence of quartz and clay minerals, Fe, As, Mo, Se, Pb indicating presence of sulphides like pyrite, Ca and Mg indicating the presence of carbonates and Rb, Cr, Th, Ga, Ta, Nb, V indicating presence of clay minerals. The coal contained in low ash (17%) and low moisture (1.4%) and high volatile matter (32%) as compared to other coals in central Alborz.
