To determine the processes occurring during magma evolution such as crystal fractionation, magma mixing, etc. This includes determining the P, T, and intensive variable conditions under which the processes occur, and the relationships of the processes to tectonic models.
To use magmas as windows to their source regions at depth. If one can “see through” the evolutionary events in the history of magmas, they can be used to estimate the P and T of their sources in the lower crust or upper mantle. Knowing the P — Tconditions at the source constrains its thermal history.
To use magma composition to constrain the chemical make-up of the source regions.
KeywordsMajor Element Composition Granitic Magma Iron Loss Rare Earth Element Plagioclase Composition
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