Satoh, H., Yamaguchi, Y., Makino, K. (2004) Ti-substitution mechanism in plutonic oxy-kaersutite from the Larvik alkaline complex, Oslo rift, Norway. Mineralogical Magazine, 68 (4) 687-697 doi:10.1180/0026461046840215
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Ti-substitution mechanism in plutonic oxy-kaersutite from the Larvik alkaline complex, Oslo rift, Norway | ||
| Journal | Mineralogical Magazine | ||
| Authors | Satoh, H. | Author | |
| Yamaguchi, Y. | Author | ||
| Makino, K. | Author | ||
| Year | 2004 (August) | Volume | 68 |
| Issue | 4 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/0026461046840215Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243567 | Long-form Identifier | mindat:1:5:243567:5 |
| GUID | 0 | ||
| Full Reference | Satoh, H., Yamaguchi, Y., Makino, K. (2004) Ti-substitution mechanism in plutonic oxy-kaersutite from the Larvik alkaline complex, Oslo rift, Norway. Mineralogical Magazine, 68 (4) 687-697 doi:10.1180/0026461046840215 | ||
| Plain Text | Satoh, H., Yamaguchi, Y., Makino, K. (2004) Ti-substitution mechanism in plutonic oxy-kaersutite from the Larvik alkaline complex, Oslo rift, Norway. Mineralogical Magazine, 68 (4) 687-697 doi:10.1180/0026461046840215 | ||
| Abstract/Notes | AbstractAmphibole 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. | ||
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