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Science 29 July 1966:
Vol. 153. no. 3735, pp. 528 - 529
DOI: 10.1126/science.153.3735.528
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Articles

Quartz and Magnetite: Oxygen-18-Oxygen-16 Fractionation in Metamorphosed Biwabik Iron Formation

E. C. Perry Jr. 1 and Bill Bonnichsen 1

1 Department of Geology and Geophysics, University of Minnesota, Minneapolis

Oxygen-18-oxygen-16 fractionation of coexisting quartz and magnetite from the Biwabik iron formation varies as a function of distance of the sample from an intrusive contact. This isotope fractionation is related to observed mineralogic variations and compared with a theoretical heat-flow model.


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