巻号一覧
60 巻, 6 号
選択された号の論文の4件中1～4を表示しています
- |<
- <
- 1
- >
- >|
-
湊 秀雄, 歌田 実1968 年 60 巻 6 号 p. 213-221
発行日: 1968/12/05
公開日: 2008/08/07
ジャーナル フリーClinoptilolite has been thotnght a zeolite which resembles to heulandite in crystal structure and is more alkalic in chemical composition. Clinoptilolite and heulandite are usually distinguished in their thermal behavior. By our present investigation, calcium rich clinoptilolite is proved to exist and its maximum value of Ca (+Mg)/Na+K attains to approximately 1/2. Consequently clinoptilolite is classified into three types; i.e. K-rich type, Na-rich type and Ca-rich type, by chemical composition. Following ion exchanges are supposed to take place.
Ca (Mg)_??_2 (Na, K)
CaAl_??_(Na, K) Si
(Na, K) Al_??_Si
Destruction of crystal structure of each type Uy heating treatment is also investigated. The Ca-rich type is destructed by heating at 400°C, and the Na-rich types at 600°C, for 4 hours, respectively without transforming into “heulandite B”. The difference of destructive temperature is possibly caused by different ion ratio of Al/Si in their frameworks. Usually Ca-rich type is easily destructed, for it is also Si-poor as a result of the ion exchange CaAl→(Na, K) Si.抄録全体を表示PDF形式でダウンロード (444K) -
1. 滝川-深川周辺の盆地型玄武岩大場 与志男1968 年 60 巻 6 号 p. 222-227
発行日: 1968/12/05
公開日: 2008/08/07
ジャーナル フリーNumerous basaltic lavas and dikes of the Pliocene have been known in the western part of Hokkaido, but little petrographic work has been carried out on those rocks so far.
The basalts designated as the basin type in this paper, are distributed around the Takikawa-Fukagawa basin and have a unique petrographic feature. Olivine and augite phenocrysts are set in the intergranular or intersertal groundmass which is composed of plagioclase, augite, olivine, alkali feldspar, magnetite, apatite and glass, whereas phenocyrstic plagioclase is completely absent. Chemically those basalts belong to the alkali olvine basalt suite, but are characterized by high alumina content. The degree of silica-undersaturation is moderate, and normative Hy is usually present only in small amount or sometimes normative Ne is calculated instead.
On the contrary, the Hamamasu basalts, Etaidake basalts and other basaltic rocks distributed to the west of the basin (Fig. 1), belong to the different type of basalt, slightly silica-understaturated, accompanying the calc-alkali andesite (Oba et al., 1966).抄録全体を表示PDF形式でダウンロード (324K) -
吉井 守正, 片田 正人1968 年 60 巻 6 号 p. 228-239
発行日: 1968/12/05
公開日: 2008/08/07
ジャーナル フリーStrongly schistosed granite with protoclastic texture is found at the eastern part of Kuji city, Iwate prefecture. Authors name the granite “Futago granite”.
The schistosity and protoclastic texture of the granite is the result of the movements of the Taro tectonic line during the granitic intrusion into the tectonic area. The process of formation of the protoclastic texture has two stages: the first stage is during the crystallization of biotite, and the second around the time when the rock was soldified.
Such protoclastic granites as above mentioned are also found in a few other localities along the Taro tectonic line which can be traced for 150km along the eastern end of northern Kitakami mountain area.抄録全体を表示PDF形式でダウンロード (1970K) -
坂野 昇平1968 年 60 巻 6 号 p. 240-253
発行日: 1968/12/05
公開日: 2008/08/07
ジャーナル フリーOn the assumption that Ca-Mg garnet is an ideal solution, we can obtain necessary conditions of the paragenetic relation in a part of the six-components system CaO-MgO-Fe203-A1203-Na20-SiO2 from that in a simple system CaSiO3-MgSiO3-A12O3.
Theoretical considerations to interrelate the paragenetic relations between simple and complex systems can determine the parameters to be kept constant when the chemical compositions of individual minerals are related to the physical conditions of formation.
For exmaples:
1) The Na2O content of omphacite should be kept constant to relate the Ca:Mg:Fe ratio of quartz-kyantie eclogite to physical conditions.
2) The 02 fugacity, Fe/Mg ratio of garnet, and Na20 content of pyroxene should be kept constant to relate the acmite content of pyroxene to physical conditions.抄録全体を表示PDF形式でダウンロード (626K)
- |<
- <
- 1
- >
- >|