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Ti-substitution mechanism in plutonic oxy-kaersutite from the Larvik alkaline complex, Oslo rift, Norway

Published online by Cambridge University Press:  05 July 2018

H. Satoh ,
Y. Yamaguchi  and
K. Makino
H. Satoh*
Affiliation:
Department of Geology, Faculty of Science, Shinshu University, Asahi, Matsumoto 390-8621, Japan
Y. Yamaguchi
Affiliation:
Department of Geology, Faculty of Science, Shinshu University, Asahi, Matsumoto 390-8621, Japan
K. Makino
Affiliation:
Department of Geology, Faculty of Science, Shinshu University, Asahi, Matsumoto 390-8621, Japan
*
*E-mail: hsatoh@ganko.tohoku.ac.jp
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Abstract

Amphibole in the Larvik alkaline plutonic complex in the Oslo rift, Norway, has Ti-rich compositions from edenite through pargasite to kaersutite, and has a large H+ deficiency (0.7–1.1 atoms per formula unit: a.p.f.u.) with a large oxy component in the amphibole OH– site (O2– = 2 – (OH + F + Cl) = 0.2–0.9 a.p.f.u.), similar to the mantle-derived kaersutites. Their compositions reveal a characteristically low Fe3+/(Fe3++Fe2+) ratio (<0.23) and a high F concentration (0.3–0.9 a.p.f.u.). Correlation with the Fe3+ ratio caused by Fe2+ + OH– = Fe3+ + O2– + 1/2H2 substitution is negligible, which is supported by H and O isotope compositions. A possible substitution, [6]Al3+ + OH– = [6]Ti4+ + O2– may be operative for Larvik kaersutites when the O2–/Ti is 1.0. A relatively larger O2–/Ti ratio (1.2—2.0) suggests an another kaersutite substitution mechanism, [6]R2+ + 2OH– = [6]Ti4+ + 2O2–, where [6]R2+ = Fe2+ + Mg + Mn. These effects might result in the limited O2–/Ti ratio value from 1.0 to 2.0.

A negative correlation between Ti and F, suggesting F incorporation into kaersutite may diminish the O2–/Ti ratio, not only due to the occupation of this non-oxy species in the O3 site, but also due to F—Ti avoidance. Composition-dependent H and O isotope variations (δD = –106 to –71% and δ18O = 4.6–5.2%) suggest equilibrium in the closed-system magma with differentiation. The mineral chemistry of Larvik oxy-kaersutitic amphibole could reflect the crystallization in a closed-system magma during rifting with passive crustal thinning at the Oslo palaeorift.

Keywords

Ti-substitutionamphiboleLarvik alkaline complexOslo RiftNorway
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 4 , August 2004 , pp. 687 - 697
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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Footnotes

†

Present address: Faculty of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan

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