Temperatures of Mineral Formation in Some Types of Deposits in Japan, as Measured by the Decrepitation Method (II)
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The writers determined electronically the formation temperatures of several mineral deposits in Japan using F. G. Smith′s decrepitation method.<BR>The Akenobe deposit is classified as xenothermal which, according to Buddington, is characterized by an abnormally steep geothermal gradient. Experiments on about 70 samples, which were collected through 500ft. of vertical range show that the deposition temperature increases with increase in depth. The higher temperature mineralizations at the 500ft. level, the upper level from which the authors collected samples, average about 300°C; those at the 1000ft. level, lowest level from which samples were collected, average about 335°C. It, therefore, appears that the deposition was related to a steep geothermal gradient. The formation temperatures of this deposit range from 350°to 160°C.<BR>The ore deposit of the Chichibu mine is a pyrometasomatic type of magnetite, zincblende and other ore minerals accompanied by skarn minerals. The formation temperatures of the minerals from this deposit are 400°to 220°C. These figures coincide with those of the Kamioka mine which is in a typical pyrometa-somatic deposit of zinc and lead.<BR>Samples from the Hosokura mine, an epithermal deposit of zinc and lead, were also studied. Their formation temperatures are somewhat lower than those of the above two deposits. However, the decrepitation of quartz from an epithermal deposit is generally weak, so it is sometimes difficult to determine the deposition temperature from the decrepigraph obtained from the authors′ equipment.
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