Experimental Constraints on the Lower Limit of Chondrule Cooling Rates

Details Experimental Constraints on the Lower Limit of Chondrule Cooling Rates Experimental Constraints on the Lower Limit of Chondrule Cooling Rates

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1405w&link_type=abstract

Lunar and Planetary Science, volume 27, page 1405

Computer Science

1

Chondrules, Cooling Rates, Olivine: Zoning

Scientific paper

Cooling rates of chondrules can be derived from dynamic crystallization experiments by comparing textures and olivine zoning patterns of the experimental charges with those of natural chondrules. Textures of granular and porphyritic olivine chondrules were experimentally reproduced at cooling rates between 10 and 2000 degrees C/h [1]. This range of cooling rates is further limited by the observed Fe/Mg zoning in olivine. According to Hewins, cooling rates below 100 degrees C/h yield chemically homogeneous olivine crystals, whereas higher cooling rates result in zoned olivine crystals comparable to those in natural chondrules. However, the lower limit of chondrule cooling rates (100 degrees C/h) is controversial. Cooling rates as low as 2 degrees C/h and 5 degrees C/h have still produced substantial Fe/Mg zoning in olivine. These results are in good agreement with estimates based on the microstructures of clinopyroxene and plagioclase, which yield an upper limit for chondrule cooling rates of 2 degrees C/h to 30 degrees C/h. We have conducted dynamic crystallization experiments in order to resolve the discrepancies between the previous experiments. Our results indicate that the lower limit for cooling rates of type II porphyritic olivine chondrules is on the order of 1 degree C/h to 10 degrees C/h.

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