巻号一覧
79 巻, 7 号
選択された号の論文の5件中1～5を表示しています
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草地 功, 逸見 千代子, 逸見 吉之助1984 年 79 巻 7 号 p. 267-275
発行日: 1984/07/05
公開日: 2008/08/07
ジャーナル フリー岡山県川上郡備中町布賀にはゲーレン石・スパー石スカルンが発達している。そのうち道路際露頭と称されている露頭のスパー石スカルン中に大江石を含む輻 1-3cm の細脈を見出した。共生鉱物としては大江石の他に,バルトフォンテイン石,スコート石,ゾノトラ石,方解石がある。大江石とスコート石はスパー石スカルン形成後の割目充填鉱物として初生的に生成され,脈中では中心部のスコート石帯の両側に,各々が 1-3mm の幅で交互に2条ずつ配列する対称的な帯状構造を示している。バルトフォンテイン石,ゾノトラ石は大江石,スコート石生成後の作用により,スコート石から二次的に生成されたものである。
この論文は大江石,パルトフォンテイン石,スコート石についての化学組成, X 線粉末回折値,光学的性質および物理的性質を求めるとともに,大江石を含む脈の構成鉱物の生成過程を考察した。抄録全体を表示PDF形式でダウンロード (1374K) -
金谷 弘, 野沢 保, 田結庄 良昭1984 年 79 巻 7 号 p. 276-288
発行日: 1984/07/05
公開日: 2008/08/07
ジャーナル フリーThe Ibaragi granitic complex in Osaka Prefecture intruded into Paleozoic formation of the Tanba Belt and consists of two separate masses, named Nose pluton and Myoken pluton.
Rock type of the Nose pluton spans from quartz diorite to adamellite. While, the Myoken pluton, intruding into the Nose pluton, consists entirely of adamellite.
Eighty-two specimens were collected from the two masses and were analysed by X-ray flourescence spectrometric and y-ray spectrometric methods on chemical major elements and some trace elements.
The relation of SiO2 to other chemical elements in whole rock of the Nose pluton is shown in a slightly curved trend. Similar tendency is found on trace elements.
On the other hand, no specific trend is identified between SiO2 and other elements of the Myoken pluton, due to its narrow SiO2 spanning. From the trace elements, however, it is divided into two groups.
It could be considered that the Nose pluton was produced through a single differentiation process of parental magma. On the contrary, the Myoken pluton seems to give a suggestion that mixing might have occurred in its parental magma, in spite of its apparent homogeneity observed in the-field.抄録全体を表示PDF形式でダウンロード (770K) -
柴田 賢, 野沢 保1984 年 79 巻 7 号 p. 289-298
発行日: 1984/07/05
公開日: 2008/08/07
ジャーナル フリーRb-Sr age determinations were carried out on the Funatsu Granitic Rocks from the area east of Kamioka and on the Mizunashi Granite from the Amo area, Hida mountains. The Funatsu and Shimonomoto type rocks, which are two major rock types of the Funatsu Granitic Rocks, give Rb-Sr whole-rock isochron age of 188.9±4.4 Ma and 197.7±15.4 Ma, with initial 87Sr/86Sr ratios of 0.70480±0.00009 and 0.70481±0.00016, respectively. The age difference between the two types is insignificant because of a large error in age of the Shimonomoto type, and thus 22 samples combined by the both types give a more probable isochron age of 188.8±4.4 Ma and an initial ratio of 0.70486±0.00006 for the Funatsu Granitic Rocks as a whole. The result suggets that the Funatsu Granitic Rocks were emplaced in Early Jurassic, within a short period of time between the deposition of the Kuruma and Tetori Groups. Minerals from the Funatsu Granitic Rocks give Rb-Sr isochron and K-Ar ages ranging from 172 to 181 Ma.
The Mizunashi Granite from the Amo area gives Rb-Sr whole-rock and mineral isochron ages of 296.7±25.6 Ma and 210.9±1.8 Ma, respectively. The age results indicate that the Mizunashi Granite is older than the Funatsu Granitic Rocks.抄録全体を表示PDF形式でダウンロード (728K) -
高井 真夫, 宮地 六美1984 年 79 巻 7 号 p. 299-303
発行日: 1984/07/05
公開日: 2008/08/07
ジャーナル フリーKeno and Kogashira pyroclastic flow deposits in the Kagoshima City, South Kyushu, have been correlated with the Blake event in the Brunhes normal epoch by Sasajima et al. (1980). Paleomagnetism and fission-track ages of zircons on these deposits have been reexamined. The ages of zircons determined by the external detector method on them are as follows: Keno, 0.9-1.0±0.1 m. y.; Kogashira, 1.0±0.3 m. y. The new ages obtained on these deposits with the reversed magnetizations indicate that these deposits should be correlated with the younger part of the Matuyama reversed epoch.抄録全体を表示PDF形式でダウンロード (394K) -
田切 美智雄1984 年 79 巻 7 号 p. 304-307
発行日: 1984/07/05
公開日: 2008/08/07
ジャーナル フリーMolybdenum blue method was improved for the analysis of P205 in rocks. P205 is concentrated as a precipitate of molybdophosphate. The precipitate is resolved with dilute NH4OH, and neutralized with 2N-H2SO4. After adjusting the acidity of solution by the mixed solution of ammonium molybdate and sulfuric acid, the solution is colored by SnCl2, a reducing agent. The stability of the color was tested and the best condition of this colorimetry was selected in the experiments. The error of this method was estimated at a ±3%. The results of JB-1 and JG-1 fit well with the previous data.抄録全体を表示PDF形式でダウンロード (249K)
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