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- W1953348295 abstract "The single-crystal X-ray technique was used to calibrate a new intracrystalline geothermometer based on equilibrium Mg-Fe* fractionation (Fe* = Fe2+ + Mn2+) between M1 and M2 sites of natural P21/c pigeonite. Suitable crystals free of exsolution textures and sharp diffraction maxima were selected by careful TEM and XRD investigations from a large number of samples. Two single crystals, PCA82506-3 (Wo6En76Fs18) from the Pecora Escarpment 82506 Antarctic ureilite, and BTS308- 2 (Wo10En47Fs43) from the BTS308 Paranà rhyodacite, were annealed at temperatures ranging from 600 to 1000 °C. The TEM investigation, carried out on fragments of selected single crystals both before and after thermal treatment, shows heating-induced texture modifications preliminary to spinodal decomposition in both crystals and a size increase in antiphase domains in BTS308-2. The two geothermometric equations calculated by linear regression of ln KD* vs. 1/T are:" @default.
- W1953348295 created "2016-06-24" @default.
- W1953348295 creator A5022901822 @default.
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- W1953348295 date "2000-07-01" @default.
- W1953348295 modified "2023-10-08" @default.
- W1953348295 title "Single-crystal thermometric calibration of Fe-Mg order-disorder in pigeonites" @default.
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- W1953348295 doi "https://doi.org/10.2138/am-2000-0709" @default.
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