鰐淵石膏の鉱物組成と組織
1966 年 82 巻 944 号 p. 1047-1050
詳細
1966 年 82 巻 944 号 p. 1047-1050
1) The Wanibuchi Gypsum Deposit is a hydrothermal replacement deposit in the late tertiary period.
2) The Gypsum Deposits consist of several bedded ore bodies and few irregular massive ores, accompanied with small amount so-called “Blaek Ore” (Kuro-kô).
3) The wall rocks of are deposits are black shale and dacitic tuff or tuff breceia (so-called Green Tuff).
The alteration products in the wall rocks are clay minerals such as Mg-chlorite, talc and montmorillonite.
4) The ore minerals are anhydrite, alabaster, selenite and satiuspar.
5) The occurence of gypsum is spheroidal, massive, or veined type.
6) The, anhydrite almost has changed to the alabaster by hydration in the later stage.
7) The crystallization stage of the anhydrite is earlier than that of the metallicminerals.
