Filters: Tags: particle-beam spectroscopy (X)4 results (318ms)
Electron microprobe geochemistry of apatite crystals in the iron oxide-apatite ores of the Adirondack Mountains, New York, 2016-2017
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...
Electron microprobe analyses of amphibole, pyroxene, and carbonate minerals from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA
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.
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.
Electron microprobe data for monazite and xenotime used in consideration of gold deposit formation models
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 different gold deposits. In addition to their importance in geochronological investigations, their minor element chemistry may be used to differentiate between metamorphic,...