The petrology of high-Mg dikes from the Beartooth Mountains, Montana - A search for the parent magma of the Stillwater Complex

Details The petrology of high-Mg dikes from the Beartooth Mountains, Montana - A search for the parent magma of the Stillwater Complex The petrology of high-Mg dikes from the Beartooth Mountains, Montana - A search for the parent magma of the Stillwater Complex

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14...53l&link_type=abstract

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

Other

5

Earth Crust, Magma, Magnesium, Montana, Petrology, Rock Intrusions, Chemical Composition, Crystallization, Feldspars, Geochemistry, Olivine, Pyroxenes, Rare Earth Elements

Scientific paper

Six geochemically distinct groups of Precambrian high-Mg dikes have been examined to determine if any could have been a sample of or closely related to the parent magma of the Stillwater Complex. Only two groups have sufficiently magnesian olivine and orthopyroxene, but neither of these has sufficiently calcic plagioclase. In terms of major elements there appear to be only two distinct magma types: one has a high orthopyroxene component and is petrographically similar to noritic dikes and sills near the Great Dyke of Zimbabwe and the Bushveld Complex of South Africa; the other is similar to primitive tholeiites with higher plagioclase and diopside components than the first. All of the groups are enriched in light-REE and have unusually high K2O concentrations. Model calculations indicate that crustal contamination of fractionating komatiitic magmas is consistent with the major and trace element characteristics of the first magma type. Less extensive contamination of komatiitic magmas may produce the parental magmas of the large layered intrusions.

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