JaLCDOI 10.18926/21191
タイトル(別表記) Petrological study of the Okutsu granodioritic mass in the northern part of Okayama Prefecture. Japan - Part 1 Geology and petrography
フルテキストURL pitsr_047_033_040.pdf
著者 先山 徹|
抄録 The Late Mesozoic granitic rocks have been studied in the Okutsu area, northern Okayama Prefecture. Main portion of the area is occupied by the Okutsu granodioritic mass. It consists of mediumgrained hornblende-biotite granodiorite, mediumgrained biotite granite, fine-grained biotite granite, and aplitic granite in the succeeding order of intrusion. Contacts between these rock-types are generally gradational and An-contents of both core and margin of the plagioclase progressively decrease with increasing acidity of the rocks. These facts indicate a cognate origin of various rock-types of this mass. The Kamisaibara granite, rather uniform coarse-grained hornblende-biotite granite, occurs in large batholith. It is inferred petrographically that the Kamisaibara granite is a member of the Ningy6,t6ge granite widely distributed on the north of this area. Field evidence suggests that the Ningyo-toge granite was intruded by the Okutsu granodioritic mass.
出版物タイトル 岡山大学温泉研究所報告
発行日 1978-03-25
47巻
開始ページ 33
終了ページ 40
ISSN 0369-7142
言語 Japanese
論文のバージョン publisher
NAID 120002310948