Other
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989metic..24..219m&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 24, Dec. 1989, p. 219-226.
Other
35
Barometers, Chondrites, Metamorphism (Geology), Meteoritic Composition, Pyroxenes, Aluminum, Chemical Composition, Petrology
Scientific paper
Geothermometry based on the compositions of clinopyroxenes in type 6 and 7 LL chondrites gives coherent results, but the estimated temperatures from coexisting orthopyroxenes are consistently lower than for clinopyroxenes. Orthopyroxene thermometry is suspect because of compositional effects of polymorphic inversions and/or unknown kinetic factors. Lack of clinopyroxene equilibration precludes accurate estimation of peak metamorphic temperatures for type 4 and 5 chondrites. There is no apparent correlation between Al content (a pressure-dependent variable) and equilibration temperature in chondritic pyroxenes. This finding, which is at variance with a previously published conclusion that temperature and pressure are correlated in metamorphosed chondrites, may have important implications for asteroid thermal models.
McSween Harry Y. Jr.
Patchen Allan D.
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