We have used a direct imaging technique, in situ atomic force microscopy (AFM) to observe the earliest stages of the dissolution of a biotite surface by oxalic acid at temperatures close to ambient conditions, using a specially designed AFM liquid cell and non-invasive intermittent contact mode of operation. From the nm-resolution data sets in x, y and z dimensions, we have measured dissolution...

Magmatic augites reacted with high temperature aqueous solutions to form secondary calcic pyroxenes during the subsolidus cooling of the Skaergaard intrusion. Secondary, hydrothermal clinopyroxenes replace wall rock igneous augites at the margins of veins filled with calcic amphibole. These veins are up to several millimeters wide and tens of meters in length. Hydrothermal clinopyroxenes are a ...

Fine scale heterogeneities in strontium isotope ratios, 40Ar-39Ar ages, and chemical com~sition have been determined for individual mineral grains and enclaves in the rhyolites of San Vincenzo, Italy. The rhyolites are peraluminous with phenocrysts of alkali feldspar, piagioclase, biotite, and cordierite and have previously been divided into two groups on the basis of whole rock major element c...

Introduction: This study presents first experimental results on the effect of fluorine on near-liquidus phase equilibria of an Adirondack-class Martian basalt. The basis of this study is our previous work on anhydrous [1] and chlorine bearing [2] systems which has already shown that: 1) the Adirondack-class basalts are evolved liquid compositions [1] and 2) that chlorine has a large effect on l...

Abstract We present Li and B isotope data for muscovite, biotite, feldspar + quartz separated from two-mica granite biotite samples the Huayang-Wulong suite (south Qinling, central China). Our demonstrate systematic differences in isotopic compositions among these minerals. results indicate that early-crystallizing minerals have lower ?7Li ?11B values than original melt residual melts late magm...

Abstract. The coexistence of chloritoid and biotite in medium-pressure Barrovian terranes is quite uncommon, the parameters controlling their equilibrium relations are still controversial. Various studies have already investigated influence pressure (P), temperature (T), bulk rock (X bulk) fluid fluid) compositions on stability this assemblage. Here we apply forward thermodynamic modelling amph...