A transmission electron microscope study of exsolution and coarsening in iron-bearing clinopyroxene from synthetic analogues of chondrules

Details A transmission electron microscope study of exsolution and coarsening in iron-bearing clinopyroxene from synthetic analogues of chondrules A transmission electron microscope study of exsolution and coarsening in iron-bearing clinopyroxene from synthetic analogues of chondrules

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36.1237w&link_type=abstract

Meteoritics & Planetary Science, vol. 36, no. 9, pp. 1237-1248 (2001)

Physics

5

Scientific paper

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 deg C to the quench temperature of 1000 deg C. Slow cooling at rates below approximately 50 - 60 deg C/hr 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/hr, and 17.4 ( 2.4 nm at a cooling rate of 50 C/hr. Faster cooling at rates between approximately 50 - 450 °C/hr 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 approximately 0.1 and 50 deg C/hr. 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.

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