著者

早川 典久

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.36, no.6, pp.169-176, 1952-12-10 (Released:2008-03-18)

参考文献数

4

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Geology and sulphur deposit in Uguisu-zawa Mine, situated in the northwestern district of Hanamaki, Iwate Prefecture, Northaest Japan, are described and some considerations on the ore genesis are mentioned. This sulphur deposit consists of some layered ore seams intercalated in mud stone which were formed in the depression caldera of small scale relating genetically to the “Kuzumaru Volcano” already reported. This sulphur deposit has been believed to be the “Lake Deposit Type” but it is more reasonable to consider that it belongs to the “Flowed Sulphur Type” from theviewpoint of the structural and textural features of the ore seams.

著者

早川 典久

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.36, no.5, pp.135-142, 1952-10-10 (Released:2008-03-18)

参考文献数

4

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1. 葛丸火山の火成活動は,鶯宿岩沢構造線上に生じた陥没地域に,葛丸川上流を中心として行われたもので,葛丸川上流に旧火口を推定することが出来る。 2. 火成活動は第I及び第II期に区分せられ,第I期は石英安山岩活動,第II期は含石英両輝石安山岩活動に屬し,夫々葛根田火山のk1(石英安山岩)及びk2(含石英安即岩)に相当し,葛根田火山に於けると同様に噴出物の性質は酸性より塩基性に向う傾向を示す。 3. 第I期の石英安山岩活動は更にIa~Ieの5期に細分され,各活動期の中間には休止期が存在する。休止期には陥没湖沼中に凝灰質泥岩層乃至砂礫層を沈積する。 4. 陥没湖沼はIa期よりId期初頭迄は存在したことが考えられるが,Id期中に全体が陸化し, Id期と1e期の間の休止期には局部的な,小陥波が起つて,硫黄鉱床が生成されている。 5. 第I期石英安山岩活動の噴出物の性質は葛丸火山全体を通じて示される傾向と同様に酸性から塩基性に向う性質を示す。

著者

宮坂 正三 早川 典久

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.81, no.930, pp.886-893, 1965-10-25 (Released:2011-07-13)

参考文献数

6

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There are many limonite deposits genetically related to the mineral springs at the vicinity of the Azuma Volcano, Fukushima Prefecture. Near the Nuruyu Spa three limonite deposits are found, and the mineral water shows highly acidity owing to the presence of sulphuric acid.This paper is concerned with studies on the chemical compositions of both mineral waters and limonites, and the relation between the pH of mineral water and limonite depositions. It seems probable, on the basis of the experimental evidence, that the optimum pH range for the iron depositions is 3.5-6.0 and that in this pH range iron precipitation is increased with higher pH. Differential thermal analysis curves and X-ray powder diffraction patterns show that the limonites deposited from the mineral springs essentially _consist of amorphous iron hydroxide containing a small quantities of goethite. Odo or yellow limonite from Akanuma and Fukuo shows the clear X-ray powder diffraction patterns of goethite.And as the result of experiments, it is shown that various minerals such as goethite, lepidocrocite, magnetite, and siderite are formed in accordance with the change of pH from 5.0 to 12.0 when NaOH or (NH4) 3CO3 solution is added to ferrous sulphate solution containing sulphuric acid or oxalic acid.