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Eclogite-facies fluid infiltration: constraints from δ18O zoning in garnet

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Abstract

In situ analysis reveals that eclogite-facies garnets are zoned in δ18O with lower values in the core and rims that are ~1.5 to 2.5 ‰ higher. This pattern is present in 9 out of 12 garnets analyzed by SIMS from four orogenic eclogite terranes, and correlates with an increase in the mole fraction of pyrope and Mg/Fe ratio from core to rim, indicating prograde garnet growth. At the maximum temperatures and the time-scales experienced by these garnets, calculated intragranular diffusion distances for oxygen are small (<5 μm), indicating that δ18O records primary growth zoning and not diffusive exchange. The oxygen isotope gradients are larger than could form due to temperature changes during closed-system mineral growth. Thus, gradients reflect the compositions of fluids infiltrating during prograde metamorphism. Values of δ18O in garnet cores range from −1 to 15 ‰, likely preserving the composition of the eclogite protoliths. Two garnet cores from the Almenningen eclogite in the Western Gneiss Region, Norway, have δ18O ~−1 ‰ and are the first negative δ18O eclogites identified in the region. In contrast with orogenic eclogites, seven high δ18O garnets (>5 ‰) from two kimberlites are homogeneous in δ18O, possibly due to diffusive exchange, which is possible for prolonged periods at higher mantle temperatures. Homogeneity of δ18O in garnets outside the normal mantle range (5–6 ‰) may be common in kimberlitic samples.

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Acknowledgments

John Fournelle assisted with electron microprobe analyses. Reinhard Kozdon assisted with the development of the SIMS jadeite standard, which was donated by George Harlow, AMNH. Rene Wiesli donated samples from Trescolmen. Toco Mining Corp and De Beers are thanked for xenolith samples. The authors thank Brian Hess for sample preparation, and Noriko Kita and the WiscSIMS group for discussions and assistance in SIMS analysis. Two anonymous reviewers assisted in the clarity and quality of this manuscript. This research was supported through grants from the Geological Society of America, Sigma Xi, National Science Foundation (EAR-0838058), and DOE (93ER14389). WiscSIMS is partially supported by National Science Foundation grants EAR-0319230, EAR-0744079, and EAR-1053466.

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  1. Department of Geoscience, WiscSIMS, University of Wisconsin-Madison, 1215 W. Dayton Street, Madison, WI, 53706, USA

    Ashley K. Russell, Kouki Kitajima, Ariel Strickland, L. Gordon Medaris Jr. & John W. Valley

  2. Department of Geology, Erindale College, University of Toronto, Mississauga, ON, L5L 1C6, Canada

    Daniel J. Schulze

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  1. Ashley K. Russell
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Correspondence to Ashley K. Russell.

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Communicated by J. Hoefs.

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Russell, A.K., Kitajima, K., Strickland, A. et al. Eclogite-facies fluid infiltration: constraints from δ18O zoning in garnet. Contrib Mineral Petrol 165, 103–116 (2013). https://doi.org/10.1007/s00410-012-0794-9

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