@article{oai:yamagata.repo.nii.ac.jp:00003038,
 author = {Muto,  Takahiro and Iwata,  Naoyoshi and Saito,  Kazuo},
 issue = {2},
 journal = {山形大学紀要. 自然科学 = Bulletin of Yamagata University. Natural Science},
 month = {Feb},
 note = {論文(Article), K-Ar ages have been determined on biotite fractions of three coarse-grained granites from the Inada area, Ibaraki Prefecture. Ages are 65.0 +/－ 2.3 Ma for Inada-I, 63.7 +/－ 2.2 Ma for Inada-II and 62.1 +/－ 2.8 Ma for Inada-III. The Inada-II sample is a better candidate than the other two samples as a K-Ar dating standard on the basis of thin section observation and K-Ar dating results. However, a chlorite removal step is necessary to make the new dating standard.},
 pages = {47--53},
 title = {K-Ar biotite ages of the coarse-grained granites from the Inada area, Ibaraki Prefecture: Evaluation of suitability for a new K-Ar dating standard},
 volume = {16},
 year = {2006}
}