Orthopyroxene as a geospeedometer: Thermal history of Kapoeta, Old Homestead 001 and Hughes 002 howardites

Details Orthopyroxene as a geospeedometer: Thermal history of Kapoeta, Old Homestead 001 and Hughes 002 howardites Orthopyroxene as a geospeedometer: Thermal history of Kapoeta, Old Homestead 001 and Hughes 002 howardites

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..347d&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 2, pp. 347-354 (2000).

Computer Science

5

Scientific paper

Orthopyroxene single-crystals from small fragments of the Kapoeta, Old Homestead 001 and Hughes 002 howardites were studied by X-ray diffraction and microprobe analyses. The Fe-Mg equilibrium distribution coefficients kDs of the crystals were used to calculate the closure temperatures using the calibration by Stimpfl et al. (1999). The compositions, the presence of exsolved augite lamellae and the Tc values (from 365 to 385 deg C) obtained for Kapoeta orthopyroxenes suggest that our fragment comes from a diogenitic cumulate clast. The more Fe-rich composition, the absence of exsolved lamellae and the higher Tc values (from 583 to 605 deg C) measured in the Old Homestead 001 orthopyroxenes suggest that this fragment comes from a cumulitic clast affected by fast cooling at high T. For the Hughes 002 orthopyroxenes, close in composition to Old Homestead 001, the different Tc (339, 358 and 607 deg C) recorded by the various crystals and the presence of augite lamellae in the crystals with the lowest Tc support the hypothesis that this howardite sample is an unheated breccia containing a mixture of cumulitic orthopyroxenes with different thermal histories.

Affiliated with

Also associated with

No associations

Rating

Orthopyroxene as a geospeedometer: Thermal history of Kapoeta, Old Homestead 001 and Hughes 002 howardites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Orthopyroxene as a geospeedometer: Thermal history of Kapoeta, Old Homestead 001 and Hughes 002 howardites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orthopyroxene as a geospeedometer: Thermal history of Kapoeta, Old Homestead 001 and Hughes 002 howardites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1299204