@article{oai:soar-ir.repo.nii.ac.jp:00012041,
 author = {藤白,  隆司 and 小坂,  共栄},
 issue = {1},
 journal = {信州大学理学部紀要},
 month = {Oct},
 note = {The Shimonita Tectonic Zone is one of the important tectonic area running from east to west along the northern marginal area of the Kanto Mountains. A small andesitic body which has intruded into the lower Miocene Shimonita Formation is newly found in the present area. Essential phenocrysts of the Okitano Andesite are plagioclase and pyroxene. The groundmass is microcrystalline in which the plagioclase crystals are oriented. The chemical compositions of major elements are similar to the Setouchi Volcanic Province of southwest Japan. It indicates that the igneous activity which is assinged to the Setouchi Province has happened in the Shimonita Tectonic Zone in age of Miocene time., Article, 信州大学理学部紀要 33(1): 17-26(1998)},
 pages = {17--26},
 title = {関東山地北縁，下仁田構造帯内部から発見された大北野安山岩},
 volume = {33},
 year = {1998}
}