The Cooling Rate of the Sioux County Eucrite

Details The Cooling Rate of the Sioux County Eucrite The Cooling Rate of the Sioux County Eucrite

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..893m&link_type=abstract

Lunar and Planetary Science, volume 27, page 893

Computer Science

2

Cooling History, Eucrites, Metamorphism: Thermal, Pyroxene, Zoning: Chemical

Scientific paper

We computed the cooling rate and burial depth of a coarse-grained leucocratic clast from the Sioux County eucrite to gain information on the evolution of eucritic crust of the HED parent body. We determined the best-fit cooling rate or burial depth by closely matching the calculated width of augite and Ca gradients of both augite and the host pyroxene to the observed profiles measured by electron microprobe. Pyroxene initially having the uniform bulk Ca content of 9.4 mol% and mg#=38 begins to exsolve at 920 degrees C and cools down to 570 degrees C at a rate of 0.01 degree C/yr, forming an augite lamella about 4.2 micrometers in width. The best-fit burial depth is about 800 m in a rock-like sheet and is about 40 m in a hot regolith deposit.

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