Topic
Enstatite
About: Enstatite is a research topic. Over the lifetime, 1662 publications have been published within this topic receiving 61231 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, a simple mixing model of orthopyroxene and garnet solid solutions enables extrapolation of experimentally determined equilibria in the MgSiO3-Al2O3 system to uninvestigated parts of pressure-temperature-composition space.
Abstract: Use of simple mixing models of orthopyroxene and garnet solid solutions enables extrapolation of experimentally determined equilibria in the MgSiO3-Al2O3 system to uninvestigated parts of pressure-temperature-composition space. Apparent discrepancies in the experimental data for simple and multicomponent systems may be explained by considering the effect of CaO and FeO on reducing pyrope activity in the garnet solid solutions. Equilibration pressures of natural garnet-orthopyroxene assemblages may be calculated, provided temperatures are known, from a combination of the experimental data on the MgSiO3-Al2O3 system and analyses of coexisting natural phases. Despite the presence of a compositional gap in the system, the solubility of enstatite in diopside coexisting with orthopyroxene can also be approximately treated by an ideal solution model. An empirical approach has been developed to take account of Fe2+ on the orthopyroxene-clinopyroxene miscibility gap in natural systems in order to calculate equilibration temperatures of 2-pyroxene assemblages. The model presented reproduces almost all of the available experimental data for multicomponent systems to within 60° C.
1,075 citations
TL;DR: In this article, the distribution of the major elements between vapor and solid has been calculated for a cooling gas of cosmic composition, assuming that high temperature condensates remain in equilibrium with the vapor, affecting the temperatures of appearance of successively less refractory phases.
1,002 citations
TL;DR: Menzies et al. as mentioned in this paper used spinel-bearing mantle peridotites from a common fertile source (PUM) between 1 and 2 Ga ago to estimate the chemical composition of domains within the mantle.
612 citations
TL;DR: In this article, the sequence of condensation of mineral phases from a cooling nebula of solar composition has been calculated by using equilibrium thermodynamics, and theoretical models suggest that the chemistry and mineralogy of Ca-Al-rich inclusions in C2 and C3 chondrites were established during condensation at temperatures above 1300 K.
Abstract: By using equilibrium thermodynamics, the sequence of condensation of mineral phases from a cooling nebula of solar composition has been calculated. The theoretical models suggest that the chemistry and mineralogy of Ca-Al-rich inclusions in C2 and C3 chondrites were established during condensation at temperatures above 1300 K. Fractionation of such inclusions is necessary to account for the refractory element depletions of ordinary and enstatite chondrites relative to the carbonaceous chondrites. The metal-silicate fractionation in ordinary chondrites took place in the nebula at a temperature below 1000 K and at .00001 atm total pressure. The volatile element depletion of C2 and C3 chondrites relative to C1 chondrites took place during chondrule formation: the most volatile elements are depleted in ordinary chondrites because they accreted before these elements were totally condensed.
580 citations
TL;DR: In this article, the abundance of thirty-one volatile elements in meteorites is reviewed, and it is shown that carbonaceous chondrites are a mixture of two types of material: a low-temperature fraction (matrix) that retained most of its volatiles and a high temperature fraction (chondrules, metal grains) that lost them.
520 citations