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Contributions to Mineralogy and Petrology

, Volume 77, Issue 1, pp 11–23 | Cite as

Oxygen isotope thermometry of basic lavas and mantle nodules

  • T. Kurtis Kyser
  • James R. O'Neil
  • Ian S. E. Carmichael
Article

Abstract

Measurements have been made of the oxygen isotope and chemical composition of glass and phenocrysts in lavas and coexisting minerals in mantle nodules. Temperatures of formation of these assemblages have been estimated from various chemical thermometers and range from 855° to 1,300° C. The permil fractionations between coexisting orthopyroxene and clinopyroxene in the lavas and nodules are all near zero. The fractionations between pyroxene and olivine vary from +1.2 to −1.4 and are a smooth function of temperature over the entire range. This function is given by T(° C)=1151-173Δ (px-d)-68Δ2(px-d) and has an uncertainty of ±60° (2σ). At temperatures above 1,150° C, olivine in the nodules becomes more18O-rich than coexisting clinopyroxene, orthopyroxene, and plagioclase. In combination with the experimental work of Muehlenbachs and Kushiro (1974), the olivine-pyroxene fractionations indicate that olivine also becomes substantially more18O-rich than basaltic liquids above 1,200° C. Geothermometers based on the oxygen isotope equilibration of basaltic liquid with olivine, pyroxene, and plagioclase are presented.

Keywords

Oxygen Nodule Fractionation Olivine Experimental Work 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • T. Kurtis Kyser
    • 1
  • James R. O'Neil
    • 2
  • Ian S. E. Carmichael
    • 3
  1. 1.Dept. of Geology and GeophysicsUniversity of CaliforniaBerkeleyUSA
  2. 2.Branch of Isotope GeologyU.S. Geological SurveyMenlo ParkUSA
  3. 3.Dept. of Geology and GeophysicsUniversity of CaliforniaBerkeleyUSA

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