Is the Ca-in-Opx geothermometer reliable?

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  • Ishibashi Hidemi
    Department of Geosciences, Graduate school of Science, Shizuoka University

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  • 斜方輝石中のCa含有量に基づく地質温度計の信頼性について
  • シャカタ キセキ チュウ ノ Ca ガンユウリョウ ニ モトズク チシツ オンドケイ ノ シンライセイ ニ ツイテ

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Description

Reliability of Ca-in-Orthopyroxene (Opx) thermometer proposed by Brey & Köhler (1990) is examined by using a compiled database of subliquidus equilibrium and above-liquidus melting experiments for multi-component peridotitic samples. The thermometer represents experimental temperature conditions, Texp, with average ΔT [ = TCa-in-Opx − Texp where TCa-in-Opx is temperature estimated by the thermometer] of −7°C and within standard deviation of 77°C. ΔT is independent on composition of Opx but shows negative relation with reciprocal absolute temperature, indicating that the geothermometer includes temperature-dependent systematic error. A revised model of Ca-in-Opx thermometer is established by adding a correction for the temperature-dependent systematic error. Reliability of the revised Ca-in-Opx thermometer is compared with that of two-pyroxene thermometer. The result strongly suggests that two-pyroxene thermometer is much reliable than Ca-in-Opx thermometer and the former should be used to estimate equilibrium temperatures of two pyroxene bearing peridotites.

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