著者

新田 恵理子 木股 三善 星野 美保子 越後 拓也 濱崎 聡志 篠原 宏志 西田 憲正 八田 珠郎 清水 雅浩

出版者

一般社団法人 日本鉱物科学会

雑誌

岩石鉱物科学 (ISSN:1345630X)

巻号頁・発行日

vol.35, no.6, pp.270-281, 2006 (Released:2007-03-15)

参考文献数

43

被引用文献数

1

---

High temperature volcanic sublimates including so-called “molybdenum blue” sampled around the high-temperature fumaroles at Iwodake volcano, Satsuma-Iwojima, Kyushu, Southwestern Japan, were characterized by X-ray powder diffraction, X-ray micro-diffraction, Raman micro-scattering, electron microprobe and X-ray photoelectron spectroscopic analyses. The identified minerals are molybdenite, sphalerite, tugarinovite, molybdite, hematite, halite, sylvite, anglesite, wulfenite, quartz, tridymite, cristbalite and potassium alum. Occurrences of both tugarinovite and molybdite are observed in Kudriavy volcano, too, and the coexistence of their minerals is characteristic of high-temperature volcanic sublimates. The molybdenite and sphalerite from Iwodake are exceedingly rich in Re (up to 0.77 wt%) and In (up to 1.69 wt%), respectively, distinguished from those of a different origin by chemical composition. The molybdenite consists of both of 3R and 2H1 polytypes. Sublimates from Iwodake and Kudriavy volcanoes are similar in mineralogy. Although the difference in the host rock arises between the Iwodake (rhyolite) and the Kudriavy (basaltic andesite) volcanoes, their volcanic gases resemble each other in F and Cl contents. This resemblance might cause the similarity in sublimate mineralogy between these volcanoes.

著者

実松 健造 星野 美保子 渡辺 寧

出版者

資源地質学会

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.62, no.1, pp.17-26, 2012 (Released:2013-08-01)

参考文献数

47

被引用文献数

3

---

This study evaluates the potential of scandium resources in lateritic bauxite deposits and lateritic Ni-Co deposits derived from mafic parent rocks. Mafic rocks generally contain more Sc than felsic rocks because Sc replaces iron and manganese in pyroxene and amphibole. Pyroxenite and hornblendite are most enriched in Sc whereas peridotite is poor in Sc. Chemical weathering causes rocks to be enriched in Sc, which behaves as an immobile element, because mobile elements are leached from the rocks. Scandium contents of bauxite depend on those of parent rocks and they are estimated to be ~40 ppm in Indochina Peninsula. Red mud, Fe-rich residue in the process of refinery of bauxite, contains high concentration of Sc. Scandium-bearing lateritic Ni-Co deposits contain higher grades of Sc ores than bauxite and recently have been explored in Australia. As Sc contents of the laterite is controlled by those of parent rocks, pyroxenite-derived laterite may form high-grade Sc deposits (>100 ppm). However, Ni and Co grades tend to decrease in the high-grade deposits in Australia. Large amounts of resources and developed techniques in Sc recovery as a by-product indicate that bauxite deposits and lateritic Ni-Co deposits are prospective Sc resources in the near future.

著者

渡辺 寧 村上 浩康 松枝 大治 吉田 武義 水田 敏夫 石山 大三 清水 正明 木村 純一 渡邊 公一郎 今井 亮 浦辺 徹郎 鹿園 直建 林 謙一郎 実松 健造 星野 美保子

出版者

独立行政法人産業技術総合研究所

雑誌

基盤研究(A)

巻号頁・発行日

2007

---

世界各地の重希土類およびインジウム鉱床の調査を実施し,ベトナム,タイ等東南アジア地域で重希土類に富む花崗岩風化殻を発見するとともに,日本,中国,ベトナム,ペルー, ボリビアでのインジウムの資源量の見積もりを行った.これらの結果,中国以外の地域でも重希土類およびインジウムの資源ポテンシャルが存在することが判明し,また鉱床成因のための必要条件が考察された.