^<40>Ar-^<39>Ar AND K-Ar AGES FOR IGNEOUS AND METAMORPHIC ROCKS FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA

• Main Authors: タキガミ ユタカ, フナキ ミノル, Yutaka TAKIGAMI, Minoru FUNAKI
• Format: Report
• Language: English
• Published: Kanto Gakuen University 1991
• Subjects: East Antarctica; Sør-Rondane; Sør Rondane Mountains; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2693; http://id.nii.ac.jp/1291/00002693/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2693&item_no=1&attribute_id=18&file_no=1

Eight ^<40>Ar-^<39>Ar and six K-Ar ages were determined for igneous and metamorphic rocks collected from the Sør Rondane Mountains, East Antarctica. Biotites from granite and syenite show ^<40>Ar-^<39>Ar ages of about 500 Ma, which are similar to the reported Rb-Sr age. K-Ar and ^<40>Ar-^<39>Ar ages of 440-480 Ma were obtained for igneous dyke samples and metamorphic rocks. ^<40>Ar-^<39>Ar age spectra for K-feldspars, which were separated from the same rocks as biotite, indicate the stair-type patterns.