Oxygen isotope temperatures of "equilibrated" ordinary chondrites

Details Oxygen isotope temperatures of "equilibrated" ordinary chondrites Oxygen isotope temperatures of "equilibrated" ordinary chondrites

Feb 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..157o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 2, pp.157-168

Physics

13

Scientific paper

Measurements have been made of O 18 / O 16 ratios of coexisting minerals (plagioclase, pyroxene, olivine) from nine ordinary chondrites. The O 18 content of a given mineral increases systematically from H through L to LL group. For example, mean O 18 for olivine is 3.7%. for H group, 4.l%. for L group, and 4.3%. for LL group. Isotope fractionations for mineral pairs fall on a concordancy line, suggesting that these minerals were crystallized in oxygen isotope equilibrium. The isotopic temperature is estimated to be 950 ± 100° C for seven of the type 5 and type 6 chondrites, while Shaw (L6) has a higher temperature (1300°C), and Bjurböle (L4) has a lower temperature (690°C). These temperatures probably represent the maxima attained during dry thermal metamorphism.

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