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"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Organic petrology of subbituminous carbonaceous shale samples from Chal\u0101w, Kabul Province, Afghanistan: Considerations for paleoenvironment and energy resource potential", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70236411", "url": "https://pubs.usgs.gov/publication/70236411" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70236411 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1016/j.coal.2009.12.007", "url": "https://doi.org/10.1016/j.coal.2009.12.007" } ], "journal": { "@type": "Periodical", "name": "International Journal of Coal Geology", "volumeNumber": "81", "issueNumber": "4" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "International Journal of Coal Geology" } ], "datePublished": "2010", "dateModified": "2022-09-06", "abstract": "Neogene (?) subbituminous carbonaceous shale deposits from Chal\u0101w, Afghanistan, were investigated through organic petrology techniques and standard coal analyses to determine paleoenvironment and potential for resource utilization. The Chal\u0101w deposit, approximately 30 km southeast of Kabul, currently is exploited for brick making and domestic heating and cooking. Three multiple-bench channel samples of the mined bed at Chal\u0101w were collected and evaluated. The presence of significant huminite (ranging from 0.2 to 59.0 vol.%, mineral-inclusive basis) is suggestive of a terrestrial lignin-rich precursor plant material. Measured reflectance values of 0.38\u20130.55% indicate subbituminous rank. This rank suggests burial depths of approximately 1500 m and maximum temperatures of approximately 50 \u00b0C. Structured liptinite macerals generally are absent except for some fluorescing morphologies interpreted to be poorly-preserved root cork suberinite. Sponge spicule bioliths including gemmoscleres and megascleres are common. These petrographic observations, in addition to high mineral matter content (33 to > 95 vol.%), medium to high sulfur content (2.1\u201311.5 wt.%, dry basis; db), and the presence of common gastropod? shell fragments and an aragonite-needle chalk bed are consistent with, but not directly indicative of, a marginal marine or estuarine mangrove depositional environment. However, additional data are necessary to confirm this hypothesis and deposition in a freshwater environment cannot be ruled out at this time.Commercial-scale development and utilization of the Chal\u0101w deposit as a thermal fuel resource may be possible using a fluidized bed combustion system which could accept the low-quality mine product currently produced. Samples examined herein contain high-ash yield (45\u201390 wt.%, db), high total moisture content (17\u201339 wt.%), low calorific value (980\u20136860 Btu/lb, m,mmf), and have poor agglomerating properties (FSI = 0), consistent with fuels utilized in fluidized bed combustors. However, delineation of the extent of the deposit through field investigation will be necessary to make a quantified resource estimate for mine planning.", "description": "12 p.", "publisher": { "@type": "Organization", "name": "Elsevier" }, "author": [ { "@type": "Person", "name": "Hackley, Paul C. phackley@usgs.gov", "givenName": "Paul C.", "familyName": "Hackley", "email": "phackley@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0002-5957-2551", "url": "https://orcid.org/0000-0002-5957-2551" }, "affiliation": [ { "@type": "Organization", "name": "Energy Resources Program", "url": "https://www.usgs.gov/programs/energy-resources-program" }, { "@type": "Organization", "name": "Eastern Energy Resources Science Center", "url": "https://www.usgs.gov/centers/geology-energy-and-minerals-science-center" } ] }, { "@type": "Person", "name": "Sanfilipo, John jsan@usgs.gov", "givenName": "John", "familyName": "Sanfilipo", "email": "jsan@usgs.gov", 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