The Genesis of Ore Deposits
The Genesis of Ore Deposits
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METASOMATIC PROCESSES IN FISSURE-VEINS. 593 tion might be in a local occurrence of waters in which the H 2 S had been oxidized to H 2 S0 4 . A partial analysis of the silicified diorite runs as follows : Per cent. SiO 2 . . . *V *'. '"*''. "'"' V^' '"'" '''"' ' . ' . 70. 30 Ai 2 o 3, *. "' ; - ' ' - : * ; ^ .^ - f ; ; l . '-' . "' . ' . 20. 00 MgO, . -.. , . . :' :, * i ... I *- * .. ; . . 0. 31 CaO, . " . . . , . '. . . '.. *-.. . 0. 27 K 2 0, . . ', . '.. V ' . . ' . ". . 1. 78 . . "'. -. - '.... : - ; . . '. ' . 'r'^ 1 - . 0. 64 The large percentage of alumina indicates the presence of kaolinite, so commonly accompanying silicification. Sericite is also present.
A further instance of silicification in part, probably, due to cementation, is mentioned in the case of certain sedimentary rocks adjoining the vein. Here again it is accompanied by a development of pyrite ; and the silicification extends to a dis- tance of 15 feet from the vein.
The Treadwell Mine, Alaska. According to G. F. Becker, f the country-rock of the celebrated Treadwell mine consists of a sodium syenite, which is strongly altered and traversed by small seams, carrying a value chiefly in gold.
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To quickly assess the difficulty of the text, read a short excerpt:
METASOMATIC PROCESSES IN FISSURE-VEINS. 593 tion might be in a local occurrence of waters in which the H 2 S had been oxidized to H 2 S0 4 . A partial analysis of the silicified diorite runs as follows : Per cent. SiO 2 . . . *V *'. '"*''. "'"' V^' '"'" '''"' ' . ' . 70. 30 Ai 2 o 3, *. "' ; - ' ' - : * ; ^ .^ - f ; ; l . '-' . "' . ' . 20. 00 MgO, . -.. , . . :' :, * i ... I *- * .. ; . . 0. 31 CaO, . " . . . , . '. . . '.. *-.. . 0. 27 K 2 0, . . ', . '.. V ' . . ' . ". . 1. 78 . . "'. -. - '.... : - ; . . '. ' . 'r'^ 1 - . 0. 64 The large percentage of alumina indicates the presence of kaolinite, so commonly accompanying silicification. Sericite is also present.
A further instance of silicification in part, probably, due to cementation, is mentioned in the case of certain sedimentary rocks adjoining the vein. Here again it is accompanied by a development of pyrite ; and the silicification extends to a dis- tance of 15 feet from the vein.
The Treadwell Mine, Alaska. According to G. F. Becker, f the country-rock of the celebrated Treadwell mine consists of a sodium syenite, which is strongly altered and traversed by small seams, carrying a value chiefly in gold.
What to read after The Genesis of Ore Deposits?
You can find similar books in the "Read Also" column, or choose other free books by Frantisek Posepn to read onlineMoreLess
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