1981 Volume 31 Issue 168 Pages 245-260
Almost one hundred granitic rocks of Cretaceous age distributed in the Gyeongsang basin, Korea, were studied petrographically and geochemically. The petrographical data of the rocks represent that they have been evolved from quartz diorite to alkali-feldspar granite, and have been crystallized rapidly at relatively shallow level with a high temperature. The geochemical data show the trend of talc-alkaline magma (PEACOCK'S index of 59) occurred at compressional plate boundaries. The variations of major elements contents and Sr isotopic composition of the rocks denote that the magma was essentially derived from the mantle or igneous sources.
The mineralizations associated with the granitic magmatism seem to be controlled in particular by circular or radial structures resulted from volcano-plutonism in the basin. The mineralized zones are recognized (1) in the sedimentary rocks, (2) in the volcanic rocks, (3) in the granitic rocks, and (4) within the breccia-pipes in volcanic and granitic rocks, and Precambrian basement.
