الفهرس 
الغلافOnly 14 pages are availabe for public view
 |  | from | 160 |  |  |
| | | from | 160 | | |
Abstract
The Crowsnest coalfield south Elk-valley, is a separated structural coalfield at The East Kootenay district in the southeastern British Columbia, Canada. The Mist Mountain Formation at middle of the Jurassic-Cretaceous Kootenay group is a nonmarine succession up to 600 m thick. The coal-bearing strata of Mist-Mountain Formation can be divided into three different ranks: Low-volatile, medium-volatile and high-volatile bituminous coal in the studied area from base to top. selected Jurassic-Cretaceous bituminous coal seams lower S10 and Upper SC of the Mist-Mountain formation, Crowsnest coalfield were investigated, for aspects of their coal rank, quality, types, depositional environment and post depositional history, coal petrography to construct a Paleo-limnological setting and from the points of comparing their quality and mineral geochemistry, as a function of their Paleo-depositional environments.
A total of twenty-two channel coal samples were assembled and measured from the sedimentary sequence from Elk-view mine at north Crowsnest area combined both the base (S10) coal seam and the top (SC) coal seam (twelve samples concern the SC and ten of the S10) of the Mist-Mountain Formation. Vitrinite reflectance Ro measuring of the S10 coal concern to low-volatile bituminous (1.61, on average). While the Ro measurements of SC coal seam show an average value of 0.98 related to high-volatile bituminous. Ash (A), gross calorific value (GCV), volatile matter (VM), fixed carbon (FC), and random vitrinite reflectance (Ro) are used to consider the rank the studied coal samples. They set the S10 as (Medium grade coal, medium rank coals (B) of meta-bituminous class) a bituminous rank group of low volatile bituminous, commonly agglomerating coal according to ASTM standard (A, 13.21 %, d. b; GCV, 34.3 MJ/KG mmmf; V.M, 19.3% dmmf; F.C, 80.7 %, dmmf and Ro, 1.6). where the studied SC (high grade coal, medium rank (C) of Orth-bituminous ) correspond to bituminous rank group of high volatile bituminous (A) class with agglomerating character (A, 8.26 %, d.b; GCV 35.2 MJ/KG mmmf; V.M, 31.14 %, dmmf; and F.C, 68.86 %, dmmf; and Ro, 0.98). Samples were collected from both studied coal seams show the same vitrinitisation genesis pathway. Their geochemical characterizations possess relatively normal hydrogen contents lay within the Seyler band diagram that indicates the optimal accumulation and preservation of peat under nearly the same waterlogged anoxic environments. In addition, the sulfur contents in the studied seams indicate that the fresh water feeding of deltaic, fluvial and/or lacustrine paleo-mire system is not vary from the base to the top of the involved formation. The maximum coalification paleo-temperature was suggested to be 179.7oC for the lower older coal seam (S10) and 133.9oC for the younger upper coal seam (SC). These temperatures can reflect a paleo-buried depth of approximately 8.6 Km at the base which decreases to be 6.4 Km at the top of the studied formation in the Crowsnest area.