Writer is studying the properties of pyrrhotite deposits in Japan, and in this report, it is especialy dealt with the paragenesis of ore minerals from following mines: Motoyama mine, Okayama prefecture. Tsuda mine, Okayama prefecture. Otani mine, Hyogo prefecture. Futaba mine, Hyogo prefecture. Komori mine, Kyoto prefecture. Okura mine, Niigata prefecture. The main results obtained, are as follows:-
(1) Ore minerals, observed on examing ores from these mines, are commonly pyrrhotite, arsenopyrite, chalcopyrite sphalerite and galena.
(2) Writer could find little pyrite in most case, and found magnetite in the ore from Motoyama mine.
(3) Magnetite in the ore from Motoyama mine, shows rosette texture or relict texture with sphalerite.
(4) Writer found a little pyrite, taking an idiomorphic form in the ore from Otani mine.
(5) Pyrrhotite, chalcopyrite and sphalerite show generally mutual boundary texture and sometimes serrate texture.
(6) Arsenopyrite and pyrite show brecciated texture or veined texture with chalcopyrite, sphalerite and pyrrhotite.
(7) In the ore from Okura mine, writer found chromite in pyrhotite, taking idiomorphic form and cubanite which may be formed by unmixing.
(8) Chalcopyrite emulsion in sphalerite, can be said to be formed by unmixing.
(9) The sequence of deposition in thses mines, shows the same tendency as follows: (1) Quartz, calcite (2) Skarns (hedenbergite, lievrite, garnet) (3) Oxide minerals (magnetite, chromite) (4) 1 st sulphide minerals (arseno pyrite, pyrite) (5)2 nd sulphide minerals (sphalerite, pyrrhotite, chalcopyrite, galena, cubanite) (6) Quartz, calcite.
抄録全体を表示