The quicksilver deposits in the Yamato metallogenic province in Japan are greatly controlled by the geological structure. They are of the vein type, filling up thrust like fault of NWSE direction in granodiorite and echelon fissures of NS trend in the foot wall of the sheared zone.
Seeing from the features of the brecciated ore, as well as from various mineral paragenesis, it appears to suggest the following facts.
(1) The following succession of mineralization is revealed:
Preeipitation→brecciation→Precipitation
This implies at least the two stages of mineralization.
(2) There had been the alternating change in chemical nature of the mineralizing solution.
(3) It might be taken consequently as showing the continuation of mineralization which is longer than being hither to inferred.
The cinnabar bearing liparite dyke found in Nara quicksilver mine may explain the relation between quicksilver deposits of this province and the young volcanic activity. In this instance, the details of paragenetic relation of cinnabar and the associated minerals in the. hydrothermal quicksilver deposits of south western Japan are seeked to be studied in relation with the young volcanic activity.

抄録全体を表示