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

Content Provider	Springer Nature Link
Author	Russell, Ashley K. Kitajima, Kouki Strickland, Ariel Medaris, L. Gordon Schulze, Daniel J. Valley, John W.
Copyright Year	2012
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.
Starting Page	103
Ending Page	116
Page Count	14
File Format	PDF
ISSN	00107999
Journal	Contributions to Mineralogy and Petrology
Volume Number	165
Issue Number	1
e-ISSN	14320967
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-28
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Garnet Eclogite Oxygen isotopes Zoning Fluids SIMS Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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