Potassium in ultramafic rocks

Details Potassium in ultramafic rocks Potassium in ultramafic rocks

Nov 1953

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953gecoa...4..241h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 4, Issue 5, pp.241-250

Computer Science

1

Scientific paper

Quantitative spectrochemical determinations of potassium in 50 specimens of ultramafic rock confirm the preliminary observation ( , and , 1952) that the abundance of potassium in this rock type is much lower than has usually been assumed. Observations have been made mainly on dunite and serpentine and in these rocks the potassium concentration averages at about 0.001%. Although it is highly unlikely that the whole of the mantle could have a chemical composition equivalent to pure dunite, a significant proportion may have. In such material the heat contribution by K 40 at a concentration of 0.001% total K, is 0.00025 × 10 -4 cal/g/yr: this is probably a small proportion (perhaps ~1/100) of that which appears to be generated (0.02 × 10 -4 cal/g/yr) by the U + Th series.

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