Metallogeny of the Japanosft Islands. 23 



As the reader will see, in the pertrification order all the 

 minerals except calcite are found in the Provinces of Korea and 

 Kitakami. This is because they all belong to the older veins, 

 which means that the formation of the minerals took place in the 

 deep, where the temperature of the emanations was very high, the 

 petrification continuing until the emanations got entirely cool. 

 The pyrite beds in the Besshi Province are supposed to have been 

 emitted from the most basic rocks such as serpentine or gabbro, 

 and therefore only the minerals of the lower position in the 

 petrification order are deposited there. The scantiness of quartz in 

 the pyritic beds is explained by the basic character of the supposed 

 ore-bringers. In the Provinces of Kosaka and Satsuma only the 

 ore-deposits of younger formation are distributed and therefore 

 such minerals as iron oxides or ferromagnesian silicates are never 

 found there. Sulphides are more abundant in the Kosaka Province 

 than in the Satsuma Province, for the fusing point of quartz- 

 trachyte is higher than that of andésite. In the gold veins in the 

 Satsuma Province, sulphides are very scanty, but if we go deep 

 down we shall find much more of the sulphides which are of a 

 higher petrification order than quartz and calcite, the two pre- 

 dominating vein-stuffs of the Satsuma Province. 



Tokyo: 



1912, October 20. 



Publ. Nov. 3rd, 1912. 



