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- W2021003899 abstract "Abstract— The microstructure of Fe-rich clinopyroxene from synthetic analogues of chondrules was studied by transmission electron microscopy. The samples were cooled at various rates from 1455 °C to the quench temperature of 1000 °C. Slow cooling at rates below approximately 50–60 °C/h leads to the development of coherent pigeonite/augite exsolution lamallae on (001). A final wavelength of 19.6 ± 1.1 nm was obtained at a cooling rate of 10 °C/h, and 17.4 ± 2.4 ran at a cooling rate of 50 °C/h. Faster cooling at rates between approximately 50 and 450 °C/h yields only modulated structures with a wavelength on the order of 17–19 nm for the (001) orientation. Coherent exsolution lamellae on (001) in clinopyroxene occur in chondrules of H, L, LL, and CV chondrites, indicating that slow cooling of chondrules at subsolidus temperatures is a widespread phenomenon. The variation of the lamellar wavelength observed in natural chondrules corresponds to a variation of the subsolidus cooling rates between ∼0.1 and 50 °C/h. The low cooling rates at subsolidus temperatures deduced from the microstructure of Fe-rich clinopyroxene point to nonlinear cooling, with cooling rates decreasing with decreasing temperature." @default.
- W2021003899 created "2016-06-24" @default.
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- W2021003899 date "2001-09-01" @default.
- W2021003899 modified "2023-09-30" @default.
- W2021003899 title "A transmission electron microscope study of exsolution and coarsening in iron-bearing clinopyroxene from synthetic analogues of chondrules" @default.
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- W2021003899 doi "https://doi.org/10.1111/j.1945-5100.2001.tb01957.x" @default.
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