巻号一覧
68 巻, 1 号
選択された号の論文の3件中1～3を表示しています
- |<
- <
- 1
- >
- >|
-
濡木 輝一, 光野 千春, 浅見 正雄1973 年 68 巻 1 号 p. 1-5
発行日: 1973/01/05
公開日: 2008/08/07
ジャーナル フリーMode of occurrence of the schistose amphibolite, which is found at Iso-o as spindleshaped body (or bodies) in “Yakuno Intrusives”, has been briefly reported by Ch. Mitsuno in 1965, but at that time petrographic properties of the rock were left unexplained. The occurrence of such metamorphic rocks as now concerned is relatively rare in the Okayama Prefecture, but not rare in the Maizuru zone east of the Okayama Prefecture.
This paper dealt with the petrography of the schistose amphibolite, and results of the study seem to support the following conclusions:
(1) The schistose amphibolite may belong to the amphibolite facies of a regional metamorphism, though type of metamorphism by which the rock was produced and its original rock are both yet unknown, and
(2) The schistose amphibolite may be a block (or blocks) derived from a part of the basement rocks which are overlaid with the Paleozoic formations of the Chugoku Province.抄録全体を表示PDF形式でダウンロード (1274K) -
矢内 桂三1973 年 68 巻 1 号 p. 6-29
発行日: 1973/01/05
公開日: 2008/08/07
ジャーナル フリーThe Matsuki granitic rocks are granodiorite to quartz diorite, carring hypersthene and augite. K-feldspars in these rocks show perthite to microcline structure. Souml;ri granitic rocks are porphyritic biotite granodiorite without pyroxene, and sometimes hornblende is present. K-feldspars in these rocks show also perthite structure. Ch_??_zenji acidic rocks are adamellite, granodiorite, porphyry and welded tuff. Optical characters of Kfeldspars in these adamellite and granodiorite indicate perthite and/or homogenous structure, and, in porphyry and welded tuff, they do not show perthite, but homogenous structure and zoning.
New chemical analyses of 32 rocks samples of these acidic rocks are given. Thier chemical compositions are similar to Nohi rhyolites and Hiroshima granites with their characteristic variation trends of several oxides.
In these acidic rockcs, the structural state of feldspars agree well with mode of their occurrences. K-feldsaprs and plagioclases in large granitic bodies belong to the orthoclaselow albite series and the low-intermediate temperature type respectively, but, those of small granitic bodies, welded tuffs and minor intrusions or dykes of porphyry are the sanidine-orthoclse series and the high-intermediate temperature type.抄録全体を表示PDF形式でダウンロード (989K) -
高島 勲, 前田 憲二郎1973 年 68 巻 1 号 p. 30-36
発行日: 1973/01/05
公開日: 2008/08/07
ジャーナル フリー地熱地帯の白色粘土化した変質帯から,火山岩のガラスや斑晶を置きかえた束沸石が見つけられた。地熱地帯からの本鉱物の産出はめずらしい。この束沸石について,光学,X線,熱的,化学的な観察,実験を行なった。これらの結果を,今までに報告されている他の地域のものと比較し,次のような結論が得られた。(1)屈折率とSi含量との間には,〓erný (1965) によって示された相関関係がよく認められた。(2)DSCによる測定から, 142cal/g・H2O という脱水エネルギーが得られた。(3)化学成分は,高いSi含量で特徴づけられる。これは,反応に関与した熱水溶液の性質によるものであろう。(4) 鉱物中のイオン置換は,今まで報告されているものと異なり, CaAlAl↔SiSi, CaAl↔NaSi という置換を持っている。抄録全体を表示PDF形式でダウンロード (918K)
- |<
- <
- 1
- >
- >|