In subsolvus or two feldspar granites crystallisation occurs at high water pressures resulting in the formation of two types of feldspar as opposed to hypersolvus granites in which crystallization at relatively low water pressures results in the formation of a single feldspar variety. Quoting Tuttle and Bowen in 1958 (abstract, page 3): ″A classification of salic rocks based on the nature of the alkali feldspar is proposed.
In subsolvus or two feldspar granites crystallisation occurs at high water pressures resulting in the formation of two types of feldspar as opposed to hypersolvus granites in which crystallization at relatively low water pressures results in the formation of a single feldspar variety. Quoting Tuttle and Bowen in 1958 (abstract, page 3): ″A classification of salic rocks based on the nature of the alkali feldspar is proposed.
Source: Wikipedia "Subsolvus" · CC BY-SA 4.0
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