Filters: Tags: particle-beam spectroscopy (X)
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The iron oxide-apatite (IOA) deposits near Mineville in the Adirondack Mountains, New York, have been of interest for their rich magnetite ore since the mid-1700s but have attracted renewed attention due to their potential as rare earth element (REE) resources (McKeown and Klemic, 1956; Lupulescu and others, 2016; Taylor and others, 2018). Apatite is the main REE-host and is found in variable concentrations within ore seams of the regional magnetite deposits. Some apatite crystals are unaltered, relatively homogenous, and inclusion-free, whereas other deposits contain heterogenous apatite with zones of abundant secondary mineral inclusions that were formed through metasomatic reactions with the apatite after initial...
This data release presents the results of microanalysis of 2 samples SSD15_01A (1 thin section and 1 composite chip sample), and SSD15_01B (1 thin section). The samples were collected in 2015 by U.S. Geological Survey geologists Bradley Van Gosen and Susan Hall from surface exposures of uranium mineralization in Sulfur Springs Draw, in Martin County, Texas (Van Gosen and Hall, 2017). The samples were collected as part of a field program designed to examine exposures of known uranium mineralization in support of the development of a genetic deposit model for calcrete-type uranium deposits in the Southern High Plains (Hall and others, 2019; Van Gosen and Hall, 2017). This study also contributed to an assessment of...
These data comprise chemical analyses in weight percent of oxides, as well as chlorine and fluorine, conducted using a JEOL JXA-8900 electron microprobe analyzer (EPMA) on amphiboles, pyroxenes, and carbonates in the Ironwood Iron-Formation.
Categories: Data;
Tags: Ashland County,
Iron County,
Iron formation,
Wisconsin,
metamorphism (geological),
This metadata file accompanies a report about the resultsof a study of the heavy minerals insamples collected from beaches and seafloor locationsin the Palos Verdes margin, south of the Los Angeles area,California. Samples were collected from 11 beach locationsbetween Hermosa Beach and Point Fermin, California. Boxcores were subsampled for 26 offshore samples.MINSPLSMC is an Arcinfo point coverage of the locations ofthe samples.
The genetic origin of many gold deposits, including Pogo in Alaska, remains controversial with questions as to whether they formed due to magmatic-hydrothermal or metamorphic-hydrothermal fluids. Gaining a better understanding of the formation mechanisms for these deposits is critical for defining proper exploration criteria in gold-bearing regions and production within these deposits. Monazite are light rare earth (LREE)-bearing and xenotime are heavy rare earth (HREE)-bearing phosphate minerals that are found as alteration products in many gold deposits. In addition to their importance in geochronological investigations, their minor element chemistry may be used to differentiate between metamorphic, magmatic,...
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