“…Replacement carbonatite, Wet Mountains area. Based on 6-step semiquantitative spectrographic and gamma ray spectrometric (RaeU and Th) analyses (Armbrustmacher and Brownfield, 1978). Number of samples -8.…”
Section: Samples and Methods Of Analysismentioning
confidence: 99%
“…Carbonatite dikes and irregularly shaped intrusions in and near the McClure Mountain and Gem Park Complexes form two distinct groups, replacement and primary magmatic, as determined chiefly by differences in petrography Armbrustmacher and Brownfield, 1978). Replacement car bonatites show textures indicating pseudomorphous replacement of an originally porphyritic or hypidiomorphic-granular rock by carbonate mineral.…”
Section: Carbonatitesmentioning
confidence: 99%
“…The replacement carbonatites contain a fairly large variety of minerals, although not as many as the primary magmatic carbonatites (table 2), based on Annbrustmacher (1979) and Armbrustmacher and Brownfield (1978). Calcite/dolomite ratios are variable although calcite is usually more abundant.…”
A description of the geologic setting, mineralogy, geochemistry, and size of thorium and rare-earth deposits, including calculations of reserves and potential economic resources
“…Replacement carbonatite, Wet Mountains area. Based on 6-step semiquantitative spectrographic and gamma ray spectrometric (RaeU and Th) analyses (Armbrustmacher and Brownfield, 1978). Number of samples -8.…”
Section: Samples and Methods Of Analysismentioning
confidence: 99%
“…Carbonatite dikes and irregularly shaped intrusions in and near the McClure Mountain and Gem Park Complexes form two distinct groups, replacement and primary magmatic, as determined chiefly by differences in petrography Armbrustmacher and Brownfield, 1978). Replacement car bonatites show textures indicating pseudomorphous replacement of an originally porphyritic or hypidiomorphic-granular rock by carbonate mineral.…”
Section: Carbonatitesmentioning
confidence: 99%
“…The replacement carbonatites contain a fairly large variety of minerals, although not as many as the primary magmatic carbonatites (table 2), based on Annbrustmacher (1979) and Armbrustmacher and Brownfield (1978). Calcite/dolomite ratios are variable although calcite is usually more abundant.…”
A description of the geologic setting, mineralogy, geochemistry, and size of thorium and rare-earth deposits, including calculations of reserves and potential economic resources
“…Majorelement analyses of mafic-ultramafic rocks from the Gem Park Complex are from Parker and Sharp (1970, Armbrustmacher (1979) and Armbrustmacher and Brownfield (1978). Radiometric ages of rocks in the complexes have been reported by Jaffe andothers (1959, p. 127), Fenton andFaure (1970), Olson and Marvin (1971), and Armbrustmacher and Hedge (1982).…”
“…Staatz and Conklin (1967), and the Goldie carbonatite has been described by Heinrich (1977). A total of 41 mineral species have been identified in the carbonatites, and they are listed in Armbrustmacher and Brownfield (1978). Calcite is ubiquitous, dolomite is very common, and strontianite and ankerite are sparse.…”
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