巻号一覧
37 巻, 1 号
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岩手県大峰鉱山産銅鉱石の研究I竹内 常彦, 南部 松夫, 和田 成人1953 年 37 巻 1 号 p. 1-9
発行日: 1953/03/10
公開日: 2008/03/18
ジャーナル フリーOhmine Mine in Iwate-Prefecture, North-eastern Japan, comprise the contact metasomatic copper deposits, situated about 3/4 miles to the north-west of Sahinai Deposit, Kamaishi Mine, the largest contact metasomatic iron deposit, in Japan. The geological formation in the neighborhood of the Mine consist of slate, schalstein, hornfels and sandstone forming the paleozoic rocks and intruded by granodiorite and quartz-diorite. The deposits have developed in a band running approximately north to south at the contact zone of hornfels and stock-like granodiorite. The relative position of the deposit and adjacent rocks and the shape of the deposit are as shown in Figs. 1-4.
Silicificantion and skarnization have been especially remarkable in the ores. The skarn rocks may be classified into 3 types according to their mineral assemblage as follows:
1) Red skarn: Characterized by presence of garnet and composed of early skarn minerals, such as some diopside, hornblende, and wollastonite, containing a little of epidote.
2) Blue skarn: Mainly consiting of epidote, hornblende and chlorite, containing small quantities of garnet, diopside and quartz.
3) White skarn: Mainly consisting of quartz and calcite, containing a considerable quantity of epidote and a little of other skarns.
The order of formation of three above types is 1)→2)→3).
Type 2 and a part of 3 are products of hydrothermal stage. The copper ores accompany 2) in most cases, only a little being found with skarn types 1) and 3).
The following 9 ore minerals were proved to exist: pyrrhotit ?? chalcopyrite, pyrite, cubanite, violarite, pentlandite, sphalerite, tetrahedrite and magnetite.
As skarn and gangue minerals, the following were found: diopside, wollastonite, garnet, epidote, feldspar, chlorite, axinite, calcite, quartz and hisingerite.
The research on the paragenesis and the intergrowh of the ore minerals will be detailed in the next report.抄録全体を表示PDF形式でダウンロード (605K) -
岩手県大峰鉱山産銅鉱石の研究II竹内 常彦, 苣木 浅彦, 南部 松夫1953 年 37 巻 1 号 p. 9-21
発行日: 1953/03/10
公開日: 2008/03/18
ジャーナル フリーNine kinds of ore minerals and eleven kinds of gangue minerals are observed on examing ores from the Omine mine under a microscope as mentioned in the previous report. Of the ore minerals, chalcopyrite contained three, cubanite, four, pyrrhotite and sphalerite, two minerals formed by unmixing, so that at least the following eleven unmixing textures can be distinguised:
1) Banded or lattice-shaped cubanite in chalcopyrite.
2) Banded lamellar chalcopyrite in cubanite.
3) Curving hair-like or vermicular py ?? rhotite in chalcopyrite.
4) Vein-shaped or lamellar pyrrhotite in cubanite.
5) “Sphalerite star” in chalcopyrite.
6) Chalcopyrite emulsion in sphalerite.
7) Banded or lattice-shaped pentlandite in pyrrhotite.
8) Lamellar or lattice-shaped pentlandite in cubanite.
9) Lamellar or vein-shaped violarite in pyrrhotite.
10) Pyrrhotite emulsion in sphalerite.
11) Lamellar or lattice-shaped sphalerite in pyrrhotite.
Of the above, 1), 3), 5), 6), and 7) have been reported from many mines, and have been proven as intergrowths formed by unmixing by means of thermal experiment, 4) and 10) are only assumed to represent unmixing textures but not yet confirmed experimentally. The others have not been noted in the past. They appear, to be unmixing textures under a microscope, but strictly speaking, their nature must be confirmed by future experiment.抄録全体を表示PDF形式でダウンロード (5743K) -
大森 啓一, 長谷川 修三1953 年 37 巻 1 号 p. 21-29
発行日: 1953/03/10
公開日: 2008/03/18
ジャーナル フリーYttrialite and abukumalite were collected from pegmatite in Iizaka Village, Fukushima Prefecture. Yttrialite has G 4.560 and n 1.7604. The result of chemical analysis is given in Table I (No. 2). Powder photograph gives a cubic unit cell a 10.532 A, its crystal structure like that of pyrochlore, koppite and atopite. The cubic yttrialite may be a metamict state. Abukumalite has G 4.567. Its bulk analysis is given in Table IV (No. 2). Powder photograph of abukumalite shows close agreement with that of apatite from Drango, Mexico and their data yield a 9.58 A, c 6.81 A for abukumalite, compared with a 9.51 A, c. 6.77 A for apatite.抄録全体を表示PDF形式でダウンロード (1868K) -
早川 典久, 北村 信1953 年 37 巻 1 号 p. 29-40
発行日: 1953/03/10
公開日: 2008/03/18
ジャーナル フリー以上を要約とする。
1. 雫石盆地西縁部地域は奧羽脊梁山地の一部をなし,花崗岩類を基底として新第三系中新統の地層が分布する。
2. 新第三系中新統は下位より,生保内層,国見層,坂本層,小志戸前層,山津田層,男助層,湯本層,橋場層に区分せられ,橋場層下底部の一部を除いて各層間に地層の不連続は存在せず,これら各層は連続して秋田角館街道に於て観察することが出来る。
3. 各層の岩相等は模式柱状図によつて示した。
4. 構造は新第三系下部層にあつては,略南北に連る平行した背斜及び向斜軸によつて,褶曲構造を繰返し,上部層にあつては,下部層の構造に支配されつゝ半穹窿状向斜構造をなし,両者共奧羽山地東縁に於て南北性断層によつて切断せられる。
5. 鉱床として特に著しいものは存在しないが,秋田岩手県境の山岳地帯には硫黄及び硫化鉄鉱床の賦存が予想せられる。抄録全体を表示PDF形式でダウンロード (866K)
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