The nature and distribution of carbon in submarine basalts and peridotite nodules

Details The nature and distribution of carbon in submarine basalts and peridotite nodules The nature and distribution of carbon in submarine basalts and peridotite nodules

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56..217m&link_type=abstract

Earth and Planetary Science Letters, vol. 56, Dec. 1981, p. 217-232.

Other

51

Basalt, Carbonaceous Rocks, Geochemistry, Grain Boundaries, Ocean Bottom, Peridotite, Carbon Compounds, Carbon Dioxide, Carbon Monoxide, Chemical Composition, Glass, Microcracks, Photomicrographs, Precipitates

Scientific paper

It is noted that primary carbonaceous material has been identified in submarine basaltic glasses and mantle-derived peridotite nodules from alkali basalts using electron microprobe techniques. In the submarine rocks, carbon occurs (1) in quench-produced microcracks in glasses and phenocrysts, (2) in vesicles, where it is preferentially concentrated on the sulfide spherules attached to vesicle walls, and (3) in microcracks and CO2-rich bubbles in inclusions of glass that are completely enclosed by phenocrysts. In peridotite nodules, carbon is encountered in intergrain cracks, along grain boundaries, and on the walls of fluid inclusions disposed in two-dimensional arrays. It is believed that the carbonaceous material consists of a mixture of graphite, other forms of elemental carbon, and possibly small amounts of organic matter. The suggestion is made that carbon precipitates by disproportionation of CO according to the reaction 2CO = C + CO and that this reaction is catalyzed by sulfide-oxide surfaces in vesicles. Once deposition has begun, the reaction also continues on carbon surfaces. It is proposed that carbon condensed from a magmatic vapor in which CO was a significant constituent.

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