Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..59....1n&link_type=abstract
Earth and Planetary Science Letters, Volume 59, Issue 1, p. 1-10.
Physics
6
Scientific paper
Oxygen isotope exchange at the contact of an igneous intrusion with host rock of different initial δ18O is examined for two examples in the Santa Rosa Range, Nevada. Exchange zones near the contacts may have formed solely by diffusive transport of oxygen through the rock. However, the δ18O variation within the zones may also be consistent with fluid flow across the intrusive/host rock contact, perhaps due to the exsolution of magmatic water as the intrusion crystallized. To explain the observed width of the exchange zones, several mechanisms of diffusion are examined. Solid state diffusion, either volume diffusion through silicate minerals or grain boundary diffusion, is 4-5 orders of magnitude too slow. Diffusion through a water-rich fluid phase, released by dehydration reactions during contact metamorphism, can be sufficiently rapid to produce the exchange zones. The narrow width of these zones implies that only a small fraction of the water that could have been released by metamorphic dehydration reactions formed connected pathways through the rock.
Nagy Kalman L.
Parmentier Marc E.
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