Geochemistry of Granitoids in Central Sumatra: An Identification of Plate Extension during Triassic

Previous investigations of granitoids in Sumatra were focused on age dating with minimum geochemistry composition analysis. The purpose this study is to define the classification intrusions central and explain rocks' correlation Southeast Asia tectonic activities. A polarizing microscope was used for petrography description while XRF ICP-MS applied measurements. According geochemistry, almost all are I-type volcanic arc granitoids. oldest studied rock Late Permian Ombilin Granite that should have been formed before West Burma move away from Cathaysia. Sulit Air Tanjung Gadang intrusion triggered by subduction Meso-Tethys beneath Lassi Pluton Lolo due Indo-Australia convergency. Triassic Sijunjung depicts A-type granite natures suggest an extension plate.