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Science 18 October 1991:
Vol. 254. no. 5030, pp. 403 - 406
DOI: 10.1126/science.254.5030.403
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Articles

Oxygen Isotope Zoning in Garnet

C. PAGE CHAMBERLAIN 1 and MARK E. CONRAD 1

1 Department of Earth Sciences, Dartmouth College, Hanover, NH 03755

Oxygen isotope zoning was examined within garnet with the use of the stable isotope laser probe. Four metamorphic garnets from the regional metamorphic terrane in Vermont and the skarn deposit at Carr Fork, Utah, were examined and were found to be concentrically zoned in dgr18O values. The largest variations in dgr18O values were observed in the regional metamorphic garnets, where dgr18O values change by 3 per mil from core to rim. These oxygen isotope zoning profiles reflect the changes in the dgr18O values of the rocks during garnet growth, which are caused by infiltration of fluids and by dehydration reactions during metamorphism.

Submitted on July 30, 1991
Accepted on September 11, 1991


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