INFOREX INFORMATION-RETRIEVAL SYSTEM - ANALYSIS AND PROCESSING OF EXPERIMENTAL-DATA ON PHASE-EQUILIBRIA IN IGNEOUS ROCKS

The most recent version of the INFOREX database (INFOREX 4.0, 1996), w hich includes experimental data on crystal-melt equilibria and a packa ge of programs for their analysis and processing, is presented. The da tabase contains the results of 186 studies (about 7000 experiments and more than 9600 phase compositions) and is currently the most complete information system in the field of experimental petrology of igneous rocks. The main options of INFOREX can be divided into the information , retrieval, and applied (Petrological Calculations) categories. The c omputational functions include: (1) calculation of regression coeffici ents describing mineral-melt equilibria for olivine, plagioclase, thre e varieties of pyroxenes and spinellids: a total of 28 geothermometers ; (2) calculation of the Fe3+/Fe2+ ratio in experimental glasses for n ine models; (3) calculation of the H2O solubility in melts for water-s aturated experiments for three models; and (4) auxiliary calculations, including the projection of glass compositions onto ternary diagrams. The paper presents examples of using the INFOREX system to analyze th e high-pressure cotectic melts Ol-Opx-Cpx and equilibrium isotherms be tween melts and amphibole under water-saturated conditions.