The partial melting of a gabbro deep in the crust could generate a felsic (granitic)magma.

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The partial melting of a mafic rock like gabbro can produce a more silica-rich (felsic) magma, such as granite or rhyolite. This is due to the fact that the minerals that melt first during partial melting are those with the lowest melting points, which are typically more silica-rich. As these minerals melt and are extracted from the solid rock, the remaining magma becomes progressively more felsic in composition.

The Partial Melting of a Gabbro Deep in the Crust