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- W2287916306 abstract "Abstract The opening-angle of quartz c-axis fabrics ( OA ) is strongly temperature dependent and has proven to be a powerful deformation thermometer for natural metamorphic rocks. Previous considerations of empirical data have identified a linear correlation between OA and temperature between 250 and 650 °C, and no correlation above 650 °C. However, possible effects of pressure have not been investigated. We expanded the data set of OA versus temperature, including data from rocks deformed over 300–1050 °C and 2.5–15 kbar. Disregarding possible effects of pressure, the OA –temperature relationship can be described by two linear correlations for the intervals ~ 250–650 °C and ~ 650–1050 °C: T ° C = 6.9 O A degrees + 48 250 ° C ≤ T ≤ 650 ° C and O A ≤ 87 ° T ° C = 4.6 O A degrees + 258 650 ° C ≤ T ≤ 1050 ° C and O A ≥ 87 ° The change on the curve slope of the OA –temperature relationship correlates approximately to the low- to high-quartz transition and to changes in the dynamic recrystallization mechanism from subgrain rotation to grain boundary migration. The available data suggest that pressure has a secondary effect accompanying the major temperature dependence of OA , which is particularly important for temperatures above 650 °C, where the correlation between OA and temperature is less pronounced. For fixed pressures, the OA has logarithmic relationships with temperature over the range 250–1050 °C. The following thermometer equation is formulated from a multiple regression: T ° C = 410.44 ln OA degrees + 14.22 P kbar − 1272 An uncertainty of ± 50 °C is inherited from the petrological temperature estimates of the natural samples. The data suggest the gradual increasing importance of prism [c] slip relative to slip in quartz with rising temperature. Under conditions of ‘average’ geological strain rate and water weakening, prism [c] slip dominates for deformation above ~ 700 °C." @default.
- W2287916306 created "2016-06-24" @default.
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- W2287916306 date "2016-03-01" @default.
- W2287916306 modified "2023-09-24" @default.
- W2287916306 title "A new empirical calibration of the quartz c-axis fabric opening-angle deformation thermometer" @default.
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- W2287916306 doi "https://doi.org/10.1016/j.tecto.2016.01.014" @default.
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