Magma ascending from the Farallon Plate under the new continental margin burned their way upward through the newly accreted Insular Belt, injecting huge quantities of granite into older igneous rocks of the Insular Belt.
Lava rising from the Farallon Plate beneath the newly formed continental edge melted its way upward through the recently attached Insular Belt, injecting massive amounts of granite into older igneous rocks of the Insular Belt.