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American Mineralogist, Volume 96, pages 1467–1474, 2011 0003-004X/11/0010–1467$05.00/DOI: 10.2138/am.2011.3637 1467 Thermodynamic properties of alloys of gold-74/palladium-26 with variable amounts of iron and the use of Au-Pd-Fe alloys as containers for experimental petrology J. Brian Balta,* John r. Beckett, and Paul d. asimow Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. aBstract Iron oxide-alloy equilibration experiments were conducted in H2-CO2 gas mixtures at 1 atm and 1125

, experimental petrology, and stability calculations based on systematically measured and compiled thermodynamic properties of minerals. In addition to providing the initial inspiration for experimental and theoretical studies of petrogenesis, quantitative field observations have had an important feedback relationship with the indoor approaches. It has been demonstrated that physico-chemical properties of mineral systems can, in favorable circumstances, be inferred from purely geologic criteria, and, in some cases, field criteria have been used to challenge the validity

quantitatively for the dynamical effects by a proper refinement procedure recently developed by Palatinus et al. [ 34 ], [ 35 ]. This procedure may allow for quantitatively refining partial occupied atom positions and localizing hydrogen atoms in the difference Fourier map [ 36 ], [ 37 ], [ 38 ], [ 39 ]. EDT applications to mineralogy and experimental petrology From the very beginning, EDT found straight way applications in mineralogy and petrology. One of the first new structures determined on the basis of EDT data was charoite-90, still one of the most complex structures (in

differentiation of magmas by liquid unmixing and for the formation of both Fe-Ti-P-rich melts and rhyolites. Keywords: Experimental petrology, binodal, basalt, rhyolite The formation of immiscible silica-rich and iron-rich melts during cooling of ferrobasalts has been recognized experimen- tally and in plutonic and volcanic rocks (Philpotts 1982; Charlier and Grove 2012; Veksler and Charlier 2015). However, unmix- ing of immiscible melts under equilibrium conditions (binodal above the liquidus) or as a metastable process (binodal below the liquidus) has long been

, Clausiusstrasse 25, CH-8092 Zürich, Switzerland 3Bayerisches Geoinstitut, Universität Bayreuth, POB 101251, D-95440 Bayreuth, Germany aBstraCt The Pt-graphite double-capsule technique is a very commonly used method in high-temperature, high-pressure experimental petrology, particularly for anhydrous experiments relevant to primitive basaltic magmas and mantle melting. We have performed a series of experiments that place better constraints on the range of oxygen fugacity imposed by this capsule material, on the Fe3+/Fe2+ ratios in experimentally produced melts and minerals

, crustal fluids, experimental petrology, thermodynamics iNtroduCtioN H2O and CO2 are major molecular components of crustal flu- ids, and silica is among the most abundant solutes. The determi- nation of quartz solubility in H2O-CO2 fluids at high temperatures and pressures is therefore essential to the study of fluid-mediated mass transfer. Experimental studies (Shettel 1974; Novgorodov 1975; Walther and Orville 1983; Newton and Manning 2000; Shmulovich et al. 2001, 2006) observed that at 400–800 °C and 1–10 kbar, quartz solubility declines greatly as CO2 increases

, but is more precise than most previous values. However, it is less negative than high-temperature determina- tions by calorimetry and electrochemistry. Our results indicate that solubility measurements at high T and P may be a superior method of free energy determination of other refractory silicate minerals. Keywords: Experimental petrology, phase equilibria, thermodynamics, zircon iNtRoduCtioN Zircon, ZrSiO4, is one of the most important minerals for geochronology (Davis et al. 2003) and for tracing geologic processes (e.g., Hoskin and Schaltegger 2003

that can account for the more “alkali” anorthosite identified in widespread isolated locales on the Moon and allow for variable ages for such anorthosite that may extend to ages of the mare basalts. Keywords: Lunar Highlands, anorthosite, experimental petrology, fractional crystallization iNtroDUctioN Ferroan anorthosite (FAN) has long been considered the dominant rock type of the primary lunar highlands crust. The lunar magma ocean (LMO) has been called upon as the means of generating the anorthositic crust of the highlands (e.g., Wood et al. 1970; Taylor and

previous studies supports the dissolution model of CaSiO3 in NaCl solutions. The low solubil- ity of the Fe2O3 component of andradite contrasts with the high solubility of magnetite and of Fe in pelitic and granitic mineral assemblages measured in acidic chloride solutions by previous workers at lower P and T. The results imply that Fe2O3 is conserved during metasomatic processes affecting calc-silicates at high metamorphic grades. Keywords: Experimental petrology, thermodynamics, fluid, crystal growth, metasomatism iNtroduCtioN An important constituent of calc

, decreasing solubility with increasing Na2O, up to about 4 wt%. At higher Na contents, Pd solubility is independent of Na content. The increase of FeO activity coefÞ cients with increasing Na content found in this study may pro- vide an explanation for decreasing FeO with decreasing degrees of partial melting in experimentally produced mantle melts (Hirschmann et al. 1998), as melts at low melting degrees are Na-rich. Keywords: Melt properties, new technique, thermodynamics, experimental petrology BORISOV ET AL.: NA EFFECT ON METAL SOLUBILITIES 763 melts (Hess 1995