岩石鉱物鉱床学会誌

閃亜鉛鉱に伴うCu-Fe-S系鉱物の離溶共生(I)

松隈寿紀, 宮久三千年

1957 年 41 巻 3 号 p. 89-97
発行日: 1957/06/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.41.89

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日高国幌滿川流城の二,三の含菫青石岩

浅井宏

1957 年 41 巻 3 号 p. 97-106
発行日: 1957/06/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.41.97

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In this paper the writer presents some considerations of the genesis of some cordierites in the cordierite bearing biotite migmatite and in the biotite bearing spinel cordierite oligoclasite and in the garnet bearing cordierite hypersthene biotite gneiss as well.
The cordierite occurs as a product between the sheared porphyroclast of the plagioclase and the younger biotite which concentrates at the mechanical movement in the later stage of formation of every metamorphic rock.

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南部日高帯猿留川地方の片麻岩類

外崎与之

1957 年 41 巻 3 号 p. 107-116
発行日: 1957/06/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.41.107

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The gneisses of this district are classified, according to the structural views, into three main types as follows: 1. banded gneiss, 2. gneissose migmatite, and 3. schistose rock. The general trend of the rocks is NW-SE and the dip is 40°_??_60° NE. The banded gneiss occurs as a narrow belt along the marginal zone of the cordierite migmatite mass, while the gneissose migmatite and the schistose rock occur in the migmatite area. The banded gneiss and the gneissose migmatite are composed mainly of medium- to coarse-grained metamorphics such as biotite gneiss, garnet sillimanite-bearing cordierite muscovite biotite gneiss, kalifelspar biotite gneiss, tourmaline-bearing muscovite biotite gneiss, and sillimanite muscovite biotite gneiss, etc. The schistose rock is dark brown, and shows schistose or hornfelsic texture. It is composed of finegrained quartz, plagioclase, and biotite, containing muscovite, kalifelspar, and rarely garnet and tourmaline. In this paper, the results of volumetric relation of chief mineral constituents and plagioclase twin method are described and mutural relationships of the rocks are discussed.

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北海道北見国沼ノ上鉱山の鉱脈について

特に母岩の変質との関係

大村宏

1957 年 41 巻 3 号 p. 116-128
発行日: 1957/06/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.41.116

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Ore deposits of the Numanoue mine located in eastern Hokkaido, are typical epithermal gold-silver bearing quartz veins in the Neogene Tertiary. The country rocks of the ore deposits are liparitic rocks which are widely distributed throughout the vicintiy.
The veins are divided into two types: one filling up along the faults and the other filling up the fissures. Thus, these types are dissimilar in some diminsions and structures of the veins. It is considered that the veins were made by at least two mineralizations. In the first mineralization, siliceous solution did not contain useful elements, and in the second mineralization useful minerals which are gold, silver and sulphide minerals (except pyrite) were deposited. Gangue mineral is chiefly quartz. In those ore deposits, various wall-rock alterations had occurred before the vein formation. Remarkable alterations are silicification, aduraliazation, chloritization and sericitization. Silicified-aduralized rocks and chloritized rocks develop in the central part of the liparite body and they show a banded distribution. Sericitized leek is distributed in the southwestern part of the one.
The veins formed in the altered rock body, usually have a banded structure. The various vein characters have close relation to the features of the altered rocks, and most of the ore shoots are found in chloritized rocks.
Moreover, it is a distinctive character of the ore deposits that both wall-rocks and veins are remarkably oxidized.

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