Showing papers by "Toshiko K. Mayeda published in 1972"
TL;DR: In this article, the authors measured the equilibrium constants for oxygen isotope exchange between quartz and water and showed that the behavior of fractionation with temperature can be approximated by 1000 ln α = 3.38 (106 T−2) − 3.40 for 200°-500°C and by 2.51 (1.96) − 1.96 for 500°-750°C.
Abstract: Equilibrium constants for oxygen isotope exchange between quartz and water have been measured from 195°C (1000 ln α = 12.0) to 750°C (1000 ln α = 0.4). Over limited temperature ranges the behavior of fractionation with temperature can be approximated by 1000 ln α = 3.38 (106 T−2) − 3.40 for 200°–500°C and by 1000 ln α = 2.51 (106 T−2) − 1.96 for 500°–750°C. The results of measurements in the quartz-water system can be combined with analogous results from other mineral systems to make mineral-pair isotopic thermometers for application to problems of petrogenesis.
1,309 citations
TL;DR: In this paper, a model involving isotopic exchange between primordial dust and a cooling solar nebular gas is discussed in terms of variations in oxygen isotopic abundances of meteoritic minerals, chondrules, whole meteorites and planets.
107 citations
TL;DR: In this paper, measurements have been made of O-18/O-16 ratios of coexisting minerals (plagioclase, pyroxene, olivine) from nine ordinary chondrites, and the isotope fractionations for mineral pairs fall on a concordancy line, suggesting that these minerals were crystallized in oxygen isotope equilibrium.
82 citations