Geochemistry and petrogenesis of the 595Â Ma shoshonitic Qunai monzogabbro, Jordan

Thermodynamic modeling applying the MELTS software indicates crystallization of this suite in the temperature range of 1184-760 °C at a pressure of 2 kbars, agreeing with olivine-pyroxene, pyroxene, and two-feldspar thermometry. The modeled mineralogy and sequence of crystallization of constituent minerals using MELTS is in remarkable agreement with the observed modal mineralogy of the monzogabbro. Furthermore, a great degree of congruity exists between the modeled and observed chemistry of the major minerals with only minor discrepancies between modeled composition of biotite and olivine.