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Wednesday, February 28, 2018

Distribution of rare earth elements in coal combustion fly ash, determined by SHRIMP-RG ion microprobe

Outside Publication: International Journal of Coal Geology
During coal combustion for electric power generation, rare earth elements (REE) are strongly retained in the ash fraction leading to significant enrichment compared to the REE content of the respective feed coals. Knowing how the REE are distributed in coal ash...

Thursday, January 04, 2018

Transgressive-regressive cycles in the metalliferous, oil shale-bearing Heath Formation (Upper Mississippian), central Montana

Outside Publication: Stratigraphy
The Upper Mississippian Heath Formation, which accumulated in the Big Snowy Trough of central Montana, has been known for three decades to contain mudrocks highly enriched in Zn, V, Mo, Ni and other metals, and source rocks for oil. The unit has more recently been...

Thursday, January 04, 2018

Nanoscale geochemical and geomechanical characterization of organic matter in shale

Outside Publication: Nature Communications
Solid organic matter (OM) plays an essential role in the generation, migration, storage, and production of hydrocarbons from economically important shale rock formations. Electron microscopy images have documented spatial heterogeneity in the porosity of OM at nanoscale...

Thursday, September 28, 2017

U.S. Coal Resources and Reserves Assessment

USGS Publication: 2017-3067
The U.S. Coal Resources and Reserves Assessment Project, as part of the U.S. Geological Survey (USGS) Energy Resources Program, conducts systematic, geology-based, regional assessments of significant coal beds in major coal basins in the United States...

Monday, March 27, 2017

Organic petrology of peak oil maturity Triassic Yanchang Formation lacustrine mudrocks, Ordos Basin, China

Outside Publication: Society of Exploration Geophysicists
An organic petrology evaluation and a determination of solid bitumen reflectance BRwere completed for organic-rich Triassic Yanchang Formation mudrocks (n=15n) from the Ordos Basin, north-central China, as part of a larger investigation of “shale gas” resources. These data were integrated with information from...

Wednesday, January 18, 2017

Notes on the origin of copromacrinite based on nitrogen functionalities and δ13C and δ15N determined on samples from the Peach Orchard coal bed, southern Magoffin County, Kentucky

Outside Publication: International Journal of Coal Geology
This paper represents the first attempt to show, by means other than just petrographic ones, that one type of macrinite, herein designated copromacrinite, may result from macrofauna feces. For that purpose a combination of coal petrography, X-ray photoelectron spectroscopy, and...

Wednesday, July 20, 2016

Application of organic petrography in North American shale petroleum systems: a review

Outside Publication: International Journal of Coal Geology
Organic petrography via incident light microscopy has broad application to shale petroleum systems, including delineation of thermal maturity windows and determination of organo-facies. Incident light microscopy allows practitioners the ability to identify various types of organic components and demonstrates that solid bitumen is the...

Wednesday, June 29, 2016

Carbon and oxygen isotopic composition of coal and carbon dioxide derived from laboratory coal combustion: A preliminary study

Outside Publication: International Journal of Coal Geology
The concentration of carbon dioxide (CO2) in the atmosphere has dramatically increased from the start of the industrial revolution in the mid-1700s to present levels exceeding 400 ppm. Carbon dioxide derived from fossil fuel combustion is a greenhouse gas and a major contributor to...

Monday, May 09, 2016

Mercury in U.S. Coal—Priorities for New U.S. Geological Survey Studies

USGS Publication: Open-File Report 2016-1033
In 2011, the U.S. Environmental Protection Agency (EPA) introduced emissions standards, known as Mercury and Air Toxics Standards (MATS), for a range of toxic constituents from coal-fired utility power stations and other combustion sources. This report presents the findings of an expert panel convened in September 2014 to assess the role of the U.S. Geological Survey (USGS) in new coal investigations that would be useful to stakeholders under MATS...

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