Pyroxene in enclaves and syenites of the Red Hill complex, New Hampshire: an ion and electron microprobe study
Article Abstract:
A study conducted in the Red Hill complex, New Hampshire, arrived at the crystallization histories of the Nepheline Sodalite Syenite (NSS) and the Outer Coarse Syenite (OCS) magmas exhibited in the clinopyroxenes, and analyzed the connections between the two units. An observation of NSS0 and its enclanes by Ion microprobe, exhibits sufficiency of REE which rises from low volues in the enclane pyroxenes to higher values in the NSS host rock pyroxenes. The residue of the NSS parental liquid were found in the syenite liquid, in a zoned magma chamber where the Garland Peak Syenite (GPS) has varied components.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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Hydrothermal alteration and REE-Th mineralization at the Rodeo de Los Molles deposit, Las Chacras batholith, central Argentina
Article Abstract:
Petrographic analysis of the mass transfer of major elements in the evolution of monzogranite to basic feldspar granite and stable isotope examination of fluids altering rock composition and depositing ores were undertaken to evaluate the course of interaction between fluids and rocks in the Las Chacras batholith. Results indicate that the addition of potassium and sodium to and the loss of calcium and strontium from biotite-containing monzogranite produced fenite. Further, perthite had replaced plagioclase and microcline. Biotite was also converted into aggregates of various minerals.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Origin of biotite-apatite-rich enclaves, Achala batholith, Argentina
Article Abstract:
Geochronological, bulk-rock geochemical and mineralogical data were obtained for samples taken from the Achala batholiths in Argentina to elucidate the petrogenesis of the area. The results provide evidence that the biotite-apatite-rich enclaves were not restites from a Precambrian source nor xenoliths of Precambrian wall rocks. The results further suggested that the enclaves are magmatic segregations, with the fluorine-rich characteristics of the biotites and apatites pointing to the high fluorine content of their magma origin.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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