Nickel–bearing Djerfisherite in Gehlenite-Spurrite Skarn at Kushiro, Hiroshima Prefecture, Japan |
| |
| Authors: | Yasushi TAKECHI Isao KUSACHI Yoshihiro NAKAMUTA Katsuo KASE |
| |
| Institution: | Department of Earth Science, Faculty of Education, Okayama University;Tsushima-Naka 3–1–1, Okayama 700–8530, Japan;Department of Earth and Planetary Science, Faculty of Science, Kyushu University;Hakozaki 6–10–1, Higashi–Ku, Fukuoka 812–8581, Japan;Department of Earth Sciences, Faculty of Science, Okayama University;Tsushima-Naka 3–1–1, Okayama 700–8530, Japan [e-mail: ] |
| |
| Abstract: | Abstract: Djerfisherite occurs intimately intergrown with troilite and pentlandite in gehlenite-spurrite skarn at Kushiro, mainly as inclusions in gehlenite and andradite grains. The mode of occurrence indicates that the djerfisherite formed in the culminated stage of the contact metamorphic-metasomatic process. The chemical compositions of the mineral are approximately represented by a formula of K6Na(Fe, Ni, Cu)24S26Cl with Ni up to 4. 85. It is likely that high temperature condition corresponding to the formation of gehlenite-spurrite skarn as well as low fO2 and fS2 conditions are responsible for the formation of djerfisherite in the potassium-rich chemical environments. |
| |
| Keywords: | Djerfisherite gehlenite spurrite monticellite troilite pentlandite skarn |
|
|
