巻号一覧
46 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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河野 義礼, 青木 謙一郎, 門脇 淳1961 年 46 巻 4 号 p. 101-110
発行日: 1961/10/05
公開日: 2008/08/07
ジャーナル フリーIwaki volcano, 1625 m. in hight, is a beautiful cone formed on the basement composed of Miocene and Pleistocene formations. In the early stage, the volcano erupted tremendous amounts of volcanic breccia of pyroxene andesite, which formed the greater part of the cone, and in the later stage, lava flows of pyroxene andesite were erupted. The central cone is composed of hornblende pyroxene andesite, which has abundant cognate xenoliths. All rocks belong to the calc-alkali rock series derived from a high-alumina basalt magma.
Nine representative rocks are chemically analysed. They are characterized by high in FeO+Fe2O3 and low in alkalies, especially K2O than those of the other volcanoes of the Chokai volcanic zone.抄録全体を表示PDF形式でダウンロード (570K) -
蟹沢 聰史1961 年 46 巻 4 号 p. 111-118
発行日: 1961/10/05
公開日: 2008/08/07
ジャーナル フリーAbstract: The Ryoke plutonic rocks of the Takato district have been divided into two groups, older and younger.
The Hiji quartz dioritic rocks belonging to the older Ryoke plutonic rocks consist of amphibolites, fine to medium grained biotite-hornblende quartz diorites, biotite-hornblende granodiorites and aplitic granites. They have the different characteristics from the older Ryoke plutonic rocks of the other districts. Namely, in spite of the various rock types of the Hiji quartz dioritic rocks, hornblende, plagioclase and epidote in them show nearly invariable petrogenetical characteristics. Normative wollastonite is calculated from the chemical composition of the Hiji quartz dioritic rocks. These facts suggest that the Hiji quartz dioritic rocks have resulted from the granitization process of basic rocks in the condition of the lower-grade of amphibolite facies.
In the mylonitization process of the Hiji quartz dioritic rocks, CaO decreases and Na2O increases.
The petrological characters of the Osafuji quartz diorite are similar to those of the younger Ryoke plutonic rocks of the other districts.抄録全体を表示PDF形式でダウンロード (473K) -
大庭 昇1961 年 46 巻 4 号 p. 119-127
発行日: 1961/10/05
公開日: 2008/08/07
ジャーナル フリーÔkueyama granite, which is essentially granodiorite, situating in the border common to Miyazaki and Ôita Prefectures in Kyûshû will be able to be divided regionally and petrographically into two types, Shishigawa type and Hôrigawa type.
The granite mass includes epixenolith characterized by spinel, corundum etc. and basic hypoxenolith characterized by augite, hornblende and a diabasic texture in widespread.
The Ôkueyama granite, especially Hô"rigawa tyep, is high in alumina and potash, and its position on the AKF diagram suggests that it has an affinity with hornfels and pelitic xenolith. Namely, the formation of this granite has a close relation with pelitic or aluminous sediments, and its heterogeneity is mainly originated from the contamination effect by them.抄録全体を表示PDF形式でダウンロード (416K) -
大森 啓一, 関 寿和, 菅井 敬一郎1961 年 46 巻 4 号 p. 128-132
発行日: 1961/10/05
公開日: 2008/08/07
ジャーナル フリーPDF形式でダウンロード (242K) -
井上 秀雄, 佐藤 和郎1961 年 46 巻 4 号 p. 133-137
発行日: 1961/10/05
公開日: 2008/08/07
ジャーナル フリーThere are three pegmatites in Ryuen mine, Fukuoka Prefecture, which intruded in Masaki granite of the middle Cretaceous. The U-Pb age of uraninite from a pegmatite has been chemically determined as 100×106 years by Kimura and Iimori (1937). Uraninite was collected from the other pegmatite, of which mode of occurrence was different from the above mentioned uraninite. It occurred in chlorite vein cut the pegmatite. In order to know whether or not any measurable time interval existed between the pegmatite solodification and the vein formation, isotopic U-Pb age was determined on the uraninite from the chlorite vein. The age of uraninite is 110×106 years and the formation of chlorite vein continued immediately after the solidification of pegmatite.抄録全体を表示PDF形式でダウンロード (713K) -
江原 真伍1961 年 46 巻 4 号 p. 138-146
発行日: 1961/10/05
公開日: 2008/08/07
ジャーナル フリーBy the Median groove running northsouth, the Ou region may be divided into two parts: the U-Etsu region, and the Ou backbone range. The former contains the Gan-Etsu Paleozoic mountain land whose northward extension comprises the Akita region which was ever torn and depressed by the pulling force of the Fossa Magna. In the Miocene times the continuous submergence of the floor of the sea and the oil bearing deep sea deposits of the Akita region might be quite due to the pulling of the Echigo Mountain Range which wes dragged by the Kwanto Range of the Fossa Magna.
But the latter comprises the Paleozoic Abukuma and part of the Kitakami range, of which the former was subjected to the dynamic activity of the Futaba fault running northsouth. In this movement the detached blocks cut by the fault havesunkrapidly within the earth, drawing the transgression sea water but at the same time spouting the Andesite lava. It formed a geosyncline which was filled in the next phase by the abundant gushing mass of Green Tuff. Since then the backbone range has kept on upheaving and the Akita region submergence.
Both the Futaba fault and the Fossa Magna disturbance may have come from the same origin and be regarded as the manifestation of the Circum-Pacific orogenic energy at that time.抄録全体を表示PDF形式でダウンロード (1143K)
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