Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..379f&link_type=abstract
Lunar and Planetary Science, volume 27, page 379
Computer Science
Scientific paper
Complex organic compounds must have been available on the early Earth. However, where they came from or how they formed has remained a subject of intense discussion. Our work looks at the solid Earth as a possible source. We have succeeded in extracting organic molecules from inside MgO and olivine in quantities sufficient to obtain not only IR, 1H- and 13C-NMR spectra but also to purify at least on of the compounds and to grow single crystals for x-ray structure determination. The MgO crystals used in these experiments had crystallized at 2860 degrees C from a melt equilibrated with CO/CO2/H2O at 1 bar in a carbon arc furnace. The olivine crystals originated from the high pressure environment of the upper mantle. Thermodynamics requires that, as a melt saturates with reactive gases such as CO, CO2 or H2O, the crystals growing from such a melt dissolve some of these gases. During cooling, the dissolved gases undergo a redox conversion by which solute CO2 reduces to C, and solute H2O reduces to H2, counterbalanced by an aliquot of O2- oxidizing to O_. As the solubility decreases with decreasing temperature, C and H2 segregate, concentrating along dislocation lines, subgrain boundaries etc.
Freund Fabian
Gupta Anupam
Kumar Dinesh
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