Activation energy for thermal release of Ar from some DSDP submarine rocks

Details Activation energy for thermal release of Ar from some DSDP submarine rocks Activation energy for thermal release of Ar from some DSDP submarine rocks

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..141o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 1, pp.141-144

Physics

Scientific paper

From the experimental data on stepwise thermal release of neutron induced 39 Ar ( 39 K (n, p) 39 Ar) from rocks and minerals, Arrhenius plots were constructed, which gave activation energies for the thermal release process. The activation energies for DSDP Leg 58 and Leg 60 submarine volcanic rocks range from 12 to 20 kcal/mol, whereas those for granodiorites and the K-feldspar separates have activation energies ranging from 37 to 48 kcal/mol. The smaller activation energies for the submarine volcanic rocks reflect the grain boundary diffusion process, while the thermal diffusion of 39 Ar from granodiorites and K-feldspar is essentially controlled by a volume diffusion. The grain boundary diffusion for the submarine volcanic rocks suggests that K resides essentially in the grain boundaries.

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