@article{oai:nipr.repo.nii.ac.jp:00002693, author = {タキガミ, ユタカ and フナキ, ミノル and TAKIGAMI, Yutaka and FUNAKI, Minoru}, journal = {Proceedings of the NIPR Symposium on Antarctic Geosciences}, month = {Sep}, note = {P(論文), 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.}, pages = {122--135}, title = {^<40>Ar-^<39>Ar AND K-Ar AGES FOR IGNEOUS AND METAMORPHIC ROCKS FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA}, volume = {5}, year = {1991} }