Abstract:

K Ar dilution and 40 Ar/ 39 Ar step heating methods have been chosen in dating the isotopic ages of the volcanic and intrusive rocks of Byers Peninsula, Livingston Island. According to the geochronological data obtained, there are three epoches of volcanic activities in studied area by the end of Late Jurassic to Late Cretaceous.The Late Jurassic-Early Cretaceous activity produced basaltic and basaltic andesitic lavas(146Ma,137Ma), followed by gabbro intrusion(135Ma) and aplite dyke (129Ma).The andesite lava (114Ma) and quartz porphyry (94Ma) are of Early Cretaceous age.The basaltic lava with thin intercalated sedimentary beds at lower part represents the Late Cretaceous-Early Tertiary igneous activity regionally.