Research Geologist
Email:
rmcaleer@usgs.gov
Office Phone:
703-648-6052
Fax:
703-648-6953
Location
12201 Sunrise Valley Drive
Reston
, VA
20192-0002
US
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Germanium (Ge) is an increasingly important element used in critical technologies for communication, defense, and computing. However, Ge is scarce, and there is no United States (U.S.) primary production. Additionally, the environmental behavior of Ge is poorly understood. Germanium does not generally form its own minerals, but is instead recovered as a byproduct of zinc mining or of coal fly ash. It has been deemed critical by the U.S. and globally, and investigations of its geologic concentration, environmental fate and transport, and potential for recovery are crucial for maintaining a sustainable supply. A relevant study site to explore questions of environmental behavior and the potential to recover...
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This data release includes 40Ar/39Ar data from the U.S. Geological Survey for samples from Old Mine Park Area, Trumbull, Connecticut. Mineral samples were collected by Robert Wintsch and Harold Moritz. Potassium-bearing mineral grains were separated from the bulk sample and analyzed by argon geochronology at the U.S. Geological Survey Bascom ARgon Dating (BARD) Laboratory in Reston, Virginia. The data provide age constraints on units in the relevant geologic mapping area.
Categories: Data;
Tags: 40Ar/39Ar,
Bascom ARgon Dating Laboratory,
Connecticut,
Economic Geology,
FBGC, All tags...
Fairfield County,
Geochemistry,
Mineral Resources,
Structural Geology,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
geologic mapping, Fewer tags
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These data are U-Pb sensitive high-resolution ion microprobe (SHRIMP) geochronology data from quartz porphyry dikes for the study of the Butte mining district, U.S.A. Results of the study are described and interpreted in Lund and others (2018).
Categories: Data;
Tags: 40Ar/39Ar geochronology,
Ag-polymetallic lodes,
BSE,
Butte,
CL, All tags...
Cu lodes,
GGGSC,
Geology, Geophysics, and Geochemistry Science Center,
MRP,
Mineral Resources Program,
Montana,
SHRIMP,
U-Pb geochronology,
United States,
alteration,
backscatter electron,
copper,
economic geology,
geochronology,
geoscientificInformation,
molybdenum,
panchromatic cathodoluminescent,
quartz porphyry dikes,
radiometric dating,
sensitive high-resolution ion microprobe,
silver,
zinc, Fewer tags
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This data release contains photographs and photomicrographs from drill cores and cuttings of pre-Middle Jurassic basement rocks that are buried beneath Coastal Plain sedimentary deposits in Florida. These samples provide rare insights into deeply buried rocks that have no surface exposures and no known exposed correlates. These images were acquired to support the characterization, discrimination, and correlation of map units comprising Florida’s basement infrastructure (Deasy and others, 2024a). These are the original images. Annotated images with additional comments are available in the companion Data Report (Deasy and others, 2024b). Semi-quantitative mineral modes of many basement rocks are presented in a companion...
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The Ironwood Iron-Formation, part of the Gogebic Iron Range in Wisconsin, is a Paleoproterozoic Superior-type banded iron formation (BIF) with substantial iron resource potential. The development of a Mesoproterozoic contact metamorphic aureole related to the emplacement of the Mellen Intrusive Complex resulted in the production of a variety of silicate minerals in the western portion of the Ironwood Iron-Formation, including amphibole, pyroxene, and olivine. The presence of amphibole minerals, some of which occur in a fibrous habit, has complicated development of this resource due to potential human health impacts. This data release provides information related to amphibole and other minerals in order that commercial,...
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