Abstract
The geochemical processes of fractional crystallization of a magma, partial fusion of a rock and assimilation or hybridization of rock(s) and/or magma(s) are generally termed as petrological mixing process. In the present paper a unified attempt has been made to describe the three processes under the purview of regression model. As the data involved are essentially compositional in nature, their suitable log-ratio transforms have been utilized and the constrained least squares principle has been applied to reach a meaningful solution. A highly accommodative procedure is suggested so as to describe any specified d~gree of fractional crystallization of magma or of partial fusion of a rock. The paper concludes with applications of the proposed method on data available from i) Rajmahal Trap, Eastern India (fractional crystallization) ii) Bihar Mica Belt, Eastern India (partial fusion) and iii) Kilauea Volcano, Hawai (formation of hybrid magma).
AMS (2000} Subject Classification: Primary: 62J05, 62P99; Secondary: 90C20.
Keywords
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