The system diopside-acmite-nepheline at low oxygen fugacity.

Fe-Ti Oxide Minerals Geothermometry and Oxygen Fugacity at the Dar Gaz Anomaly, Kahnuj

In the southeast of Iran, titaniferous magnetite deposits associated with the gabbro rocks occur in Kahnuj ophiolitic complex. Mineraloghraphy studies have revealed the primary and secondary ore mineral consist of titanomagnetite, ilmenite, hematite, goethite, martite, pyrite, chalcopyrite, pyrrhotite and silicate minerals (plagioclase, pyroxene, hornblende, olivine, alkali feldspar). Trellis-s...

THE SYSTEM DIOPSIDE – FORSTERITE – ENSTATITE AT 5.1 GPa: A TERNARY MODEL FOR MELTING OF THE MANTLE¶

Data determined using a multianvil press are given for liquidus phase relations in the system diopside – forsterite – enstatite (CaMgSi2O6 – Mg2SiO4 – MgSiO3) and extend for a limited distance into the larger ternary system diopside – forsterite – quartz at 5.1 GPa. In the system diopside–enstatite, which cuts across the system diopside – forsterite – quartz and divides it into two smaller tern...

Estimates of Oxygen Fugacity in the Basaltic Shergottites from Electron Microprobe Oxygen Analysis

Oxygen Fugacity at High Pressure: Equations of State of Metal-oxide Pairs. A

Introduction: Oxygen fugacity (fO 2) varies by orders of magnitude in nature, and can induce profound changes in the chemical state of a substance, and also in the chemical equilibrium of multicomponent systems. One prominent area in high pressure geochemistry, in which fO 2 is widely recognized as a principal controlling factor, is that of metal-silicate partitioning of siderophile trace eleme...

The Oxygen Balance of Primordial Mars: Oxygen Fugacity of Selected Snc Meteorites,

Martian surface can be accounted for by two methods of production; photolysis of water molecules via solar ultraviolet light, releasing hydrogen and oxidising iron, and, the residual effects of the addition of biogenic redox products. We can estimate the amount of Fe 3+ created by photodissociated oxygen by observing the primordial and current redox states of Mars. This is conducted via calcula...