... VNUJournal of Science,EarthSciences23(2007)253‐264253 Ar‐Ar age of metamorphic and mylonitic rocks in northern part of the Kon Tum massif: evidence for the Indosinian movement along shear zones between Kon Tum massif and Truong Son belt VuVanTich1,*,HenriMaluski2,NguyenVanVuong11College of Science,VNU2ISTEM,University of MontpellierII,FranceReceived4October2007;received in revisedform10December2007Abstract. The studiedareaissituated ... ductiledeformation and results of Ar‐Ar dating in thisarea in orderto constrain in detail the spatial metamorphic evolution and interpretation of geodynamicsetting of the Indochina.2. ... maintectonic boundary between Kon Tum metamorphic massif and non metamorphic Truong Son belt during Indosinian movement. Ensemble of structural measurementsshowing the southerndipregionalfoliation and the ...