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Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2339m&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Sept. 1987, p. 2339-2347. Research supported by the Universite de Par
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14
Carbonaceous Rocks, Earth Mantle, Igneous Rocks, Inclusions, Isotopic Enrichment, Petrology, Electron Spectroscopy, Volcanoes, X Ray Spectroscopy
Scientific paper
Carbonaceous matter in xenoliths, present as particles in prominent cracks and as a semicontinuous film on microcracks, was characterized. Samples of tectonized dunite and wehrlite cumulates from the Hualalai Volcano (Hawaii) were analyzed using X-ray and electron spectroscopic techniques. The particles, found to be partially chlorinated, contain detectable amounts of Si and K and are believed to be the host phase for Rb, La, and other minor and trace elements. The films consist of complex mixtures of organic and, possibly, graphitic compounds and may include alcohols, organic acids, or other compounds unstable at elevated temperature. Nitrogen was frequently observed. Most cracks in xenoliths are believed to have developed during quenching, resulting in the exposure of chemically active surfaces. The carbonaceous films have formed abiotically, by condensation from hot volcanic gas and the low-temperature compounds formed by evolution from simpler high-temperature condensates during cooling.
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