"HYDRATED TALC"-AN ALTERATION PRODUCT OF WOLLASTONITE BY REACTION WITH MAGNESIUM-BEARING HYDROTHERMAL SOLUTION

スポンサーリンク

概要

• 論文の詳細を見る

• A clayey material consisting predominantly of the trioctahedral 2 : 1 phyllosilicate which is similar to talc rather than stevensite, with a basal spacing of 9.7A, was found in hydrothermal-alteration products of wollastonite-rich skarn at the Akatani copper-iron mine, Niigata Prefecture, Japan, by one of the present authors (N. I.). The material occurs as a small pocket in the wollastonite-rich skarn, and is pseudomorphous after wollastonite. Field relations indicated that the small pocket is located in an intermediate subzone between inner talc and outer stevensite zones. Chemical analysis of the clay fraction less than 2μ leads to the following structural formula for the mineral in question per unit-cell-layer on the basis of O_<20> (OH)_4 anion unit ; (Mg_<5.81>Mn^<2+>_<0.40>Fe^<3+>_<0.06>) (Si_<7.73>Al_<0.15>) O_<20> (OH)_4 (Na_<0.02>K_<0.02>)・nH_2O. X-ray diffraction, thermal and infrared absorption analyses revealed that the mineral in question is a variety less hydrated than stevensite, and may be named as "hydrated talc". Based upon the field relations, information on the formation temperatures of minerals from the mine obtained by means of fluid-inclusion thermometry, and the synthetic data for the system MgO-SiO_2-H_2O, the mineral in question was identified as an alteration product of the preexisting wollastonite at temperatures of 250°〜300℃ by the action of magnesium-bearing hot water, which journeyed through a channel-way immediately before ore-formation and simultaneously dolomitized limestone wallrock.

• 日本粘土学会の論文

著者

• OTSUKA RYOHEI

  Department of Mineral Resources Engineering, School of Science and Engineering, Waseda University

• Otsuka Ryohei

  Department Of Mineral Industry School Of Science And Engineering ; Science And Engineering Research

• SAKAMOTO TAKABUMI

  Department of Applied Science, Faculty of Science, Okayama University of Science

• IMAI NAOYA

  Department of Mineral Industry, School of Science and Engineering ; Science and Engineering Research

• NAKAMURA TADAHARU

  Department of Mineral Industry, School of Science and Engineering ; Science and Engineering Research

• TSUNASHIMA ATSUMU

  Department of Mineral Industry, School of Science and Engineering ; Science and Engineering Research

• Tsunashima Atsumu

  Department Of Mineral Industry School Of Science And Engineering ; Science And Engineering Research

• Sakamoto Takabumi

  Department Of Mineral Industry School Of Science And Engineering ; Science And Engineering Research

• Nakamura Tadaharu

  Department Of Mineral Industry School Of Science And Engineering ; Science And Engineering Research

• Imai Naoya

  Department Of Mineral Industry School Of Science And Engineering ; Science And Engineering Research

関連論文

• Preparation of lead oxide-montmorillonite complex
• ARTIFICIAL WEATHERING OF GRANITE UNDER EARTH SURFACE CONDITIONS : THE INFLUENCE OF ACID RAIN ON ROCKS AND MINERALS (PART 3)
• "HYDRATED TALC"-AN ALTERATION PRODUCT OF WOLLASTONITE BY REACTION WITH MAGNESIUM-BEARING HYDROTHERMAL SOLUTION
• STEVENSITE FROM THE AKATANI MINE, NIIGATA PREFECTURE, NORTHEASTERN JAPAN
• PHASE CHANGE OF LAUMONTITE UNDER RELATIVE HUMIDITY-CONTROLLED CONDITIONS
• VANADIUM-BEARING GREEN MICA FROM THE JANGSAN QUARTZITE IN THE JANGGUN MINE AREA, REPUBLIC OF KOREA
• Mineralogy of Chinese Stone Carvings.
• A New Model of the Excess Gibbs Energy of Mixing for a Regular Solution.

スポンサーリンク