Stillwater anorthosites - A lunar analog?

Details Stillwater anorthosites - A lunar analog? Stillwater anorthosites - A lunar analog?

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14...27s&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

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5

Anorthosite, Earth Crust, Lunar Rocks, Magma, Neutron Activation Analysis, Chemical Composition, Feldspars, Petrography, Pyroxenes, Trace Elements, Moon, Analogs, Anorthosites, Samples, Terrestrial, Inaa, Trace Elements, Neutron Activation Analysis, Rare Earth Elements, Concentrations, Analysis, Mineralogy, Evolution, Liquid Phase, Composition, Laboratory Studies, Procedure, Petrography, Characteristics, Stratigraphy, Plagioclase, Pyroxene, Statistical Analysis, Distribution, Stillwater Crater, Montana

Scientific paper

Samples of anorthosite from Stillwater complex units AN-I and AN-II have been studied by instrumental neutron activation analysis for FeO, CaO, Na2O, REE, and other trace elements, and the results are discussed. No systematic variations of chemical composition with stratigraphic position were observed. The major and trace compositions of both units appear to be identical, with plagioclase compositions virtually constant throughout both. Thus, there is almost no evidence for evolution of parent magma composition during the genesis of these units. The bulk of the anorthosites appear to consist of cumulus-adcumulus plagioclase and pyroxene. Very little trapped liquid component was found. The chemical elements are not normally or lognormally distributed among samples taken from either anorthosite unit. The irregular distribution of pyroxene oikocrysts indicates that interstitial melt migrated substantially prior to final consolidation of the rock.

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