INFOREX-3.0 - A DATABASE ON EXPERIMENTAL STUDIES OF PHASE-EQUILIBRIA IN IGNEOUS ROCKS AND SYNTHETIC SYSTEMS .2. DATA DESCRIPTION AND PETROLOGICAL APPLICATIONS

The purpose of the paper is to provide details of the application of t he INFOREX-3.0 database, a package designed to store, retrieve, and pr ocess phase equilibria information. This most recent release of the sy stem accesses data of 162 experimental studies, conducted from 1962 to 1994, including a total of 6174 experiments with 5188 addressed to na tural igneous rocks and 986 runs carried out in synthetic systems, mos tly CMAS. The total database was divided into 3893 ''dry'' conditions experiments, and 2281 runs performed in the presence of H2O and/or CO2 : 1618 of the ''wet'' runs represented are water saturated. The number of 1 atm experiments (3750) is greater than the number of high-pressu re runs (2474). The INFOREX database contains 8311 coexisting phase co mpositions: 3197 for glasses, 1247-olivine, 1429-pyroxenes, 501-spinel s, 842-plagioclase. One block of the INFOREX information includes 298 liquid compositions where the Fe3+/Fe2+ ratio was determined. Data for sulfur and water solubility experiments also have been systematized. The INFOREX data management system allows users to find and print out data on a specific set of mineral-melt or two mineral equilibrium expe riments requested for a given range of temperatures, pressures, oxygen fugacities, and compositions in a matter of a few seconds. In additio n, one can use subsets of the data to develop mineral-melt geothermome ters for equilibria including olivine, plagioclase, pyroxenes, and spi nels for any specific system type. Two examples illustrate the use of INFOREX for testing empirical equations proposed for the calculation o f water solubility and Fe3+/Fe2+ ratio in basic to acid melts. Copyrig ht (C) 1996 Elsevier Science Ltd