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Oxygen isotope thermometry of basic lavas and mantle nodules

Contributions to Mineralogy and Petrology

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, ,
DOI: 10.1007/BF01161498

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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)=1151-173?? (px-d)-68??2(px-d) and has an uncertainty of ??60?? (2??). 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. ?? 1981 Springer-Verlag.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Oxygen isotope thermometry of basic lavas and mantle nodules
Series title:
Contributions to Mineralogy and Petrology
DOI:
10.1007/BF01161498
Volume
77
Issue:
1
Year Published:
1981
Language:
English
Publisher location:
Springer-Verlag
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Contributions to Mineralogy and Petrology
First page:
11
Last page:
23
Number of Pages:
13