The Aurora volcanic field, located along the northeastern margin of Mono Lake in the Western Great Basin, has erupted a diverse suite of high-K and shoshonitic lava types, with 48 to 76 wt% SiO2, over the last 3.6 million years. There is no correlation between the age and composition of the lavas. Three-quarters of the volcanic field consists of evolved (,4 wt% MgO) basaltic andesite and andesi...

The formation of peralkaline melts is generally recognized to be related to enrichment of the mantle in sodium or potassium during a metasomatic event that predated magma generation. The wide range in mineral assemblages, mineral compositions, and fluid compositions in peralkaline melts are, to a large extent, a function of the sodium/potassium content of these mantle-metasomatizing fluids, whi...

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...

Abstract Magma oceans (MOs) are episodes of large-scale melting the mantle terrestrial planets. The energy delivered by Moon-forming impact induced a deep MO on young Earth, corresponding to last episode core-mantle equilibration. crystallization this led outgassing volatiles initially present in Earth’s mantle, resulting formation secondary atmosphere. During outgassing, acts as chemical buffe...

This work introduces an in vivo cancer marker in mice from the altitude of the well, determined by this cancer. The duration of development and the altitude of the cancer well are obtained from the synchronization of the mechanics and the kinetics of the processes of normal and anomalous transport under tumor mass growth. The mechanics and the kinetics of these two transports are found from the...

introduction the nabar area that is a part of the urumieh- dokhtar volcano- plutonic belt is located in the south of kashan. research works such as emami (emami, 1993) and abbasi (abbasi, 2012) have been done about the geology of this area. rock units in the study area contain middle- upper eocene intermediate to acidic lavas and pyroclastic rocks, green marl, shale and sandy marls of oligo- mi...

A calibration procedure is presented for the use of a Y2O3-stabilized zirconia (YSZ) oxygen sensor in 1 atm gas-mixing furnaces in the temperature range 1200–1500°C and 0–8 orders of magnitude below the iron-wüstite (IW) buffer. Corrections to the Nernst equation were obtained by measuring apparent oxygen fugacities of gases in equilibrium with graphite (equilibrated with pure CO vapor), Cr 1 C...

We investigated the crystal and structural behavior of Cr-bearing spinels from Archean chromitites Sittampundi (India), which had been subjected to very high-grade metamorphism. The data show that their oxygen positional parameters are among highest ever recorded for with similar Cr# Mg# those found other occurrences. general agreement between electron microprobe Mössbauer indicates analyzed st...