Ti-rich hornblende in successively zoned amphibole from thermally metamorphosed basaltic rock in the Shionomisaki igneous complex

• Makino Kuniaki

  Department of Geology, Faculty of Science, Shinshu University

• Yanagida Takeshi

  Department of Geology, Faculty of Science, Shinshu University

• Yamaguchi Yoshiaki

  Department of Geology, Faculty of Science, Shinshu University

Bibliographic Information

Other Title

• 潮岬火成複合岩体の熱変成玄武岩産累帯角閃石のTiに富むホルンブレンド
• Ti-rich hornblende in successively zone

Abstract

Amphibole from thermally metamorphosed basalt in the Shionomisaki igneous complex, southwest Japan is successively zoned from edenite to Ti-rich hornblende through actinolite. The amphibole compositions show large compositional range of Al^IV, which is strongly positively correlated with ΣA and Ti contents. Fe³⁺ content of the Ti-rich hornblende is estimated to be very low, based on routine amphibole structural constraints. Ti rich amphibole (kaersutite) from the upper-mantle is generally deficient in H⁺ of the O3 site, and is regarded as Ti replacing Al balanced by O^2- for OH^-. Infrared absorbance analyses indicate, however, that substitution of OH^- by O^2- in the O3 site is negligible in the Ti rich hornblende from thermally metamorphosed basaltic rock. Strong correlation between Ti and Al^IV suggests that the conventional Ti-tschermakite substitution, R²⁺+2Si Ti+2Al^IV (R²⁺=Fe²⁺+Mn+Mg), caused the Ti-incorporation, without the oxy substitution (OH^- O^2-) in the O3 site. The relationship between ΣA and Al^IV implies that the edenite substitution is also dominant along the amphibole zoning.

Journal

• Earth Science (Chikyu Kagaku)

  Earth Science (Chikyu Kagaku) 51 (3), 223-227, 1997

  The Association for the Geological Collaboration in Japan

Keywords

• zoned amphibole
• Ti-tschermakite substitution
• OH
• IR absorbance
• Shionomisaki igneous complex

Details

• CRID: 1390001204266840576
• NII Article ID: 110004862342
• NII Article ID: 10002219588
• NII Book ID: AN00141269
• DOI: 10.15080/agcjchikyukagaku.51.3_223
• ISSN: 21897212
• ISSN: 03666611
• NDL BIB ID: 4215068
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4215068
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed