Other
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3785g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 18, pp.3785-3793
Other
27
Scientific paper
A pronounced, systematic variation, by a factor of 10 4 , in strontium tracer diffusion kinetics has been measured in four feldspar specimens that span the range of plagioclase compositions. The experiments were carried out in air, using isotopically enriched 86 Sr, and analyzed with an ion microprobe. The Arrhenius relations for strontium diffusion are: No difference was found, within the measurement uncertainty, between these results and those for albite under hydrothermal conditions at one kbar (100 MPa). Strontium diffusion rates parallel to, and normal to the albite twin lamellae are the same. There is no effect on the strontium diffusion rate in albite between an oxygen partial pressure of 0.2 bar (air) and ~ 10 -19 bar (graphite buffer). A relation is developed that permits calculation of the strontium diffusion Arrhenius parameters for any normal plagioclase composition. The large variation in diffusion rate with composition has a major effect on the ease of strontium isotope exchange at high temperatures between plagioclases and coexisting phases in rocks, which may prove useful in determining thermal histories.
Casserly E. D. J.
Giletti Bruno J.
No associations
LandOfFree
Strontium diffusion kinetics in plagioclase feldspars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Strontium diffusion kinetics in plagioclase feldspars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strontium diffusion kinetics in plagioclase feldspars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1789474