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Title: Fluid-Driven Mass Transfer During Retrograde Metamorphism and Exhumation of the UHP Western Gneiss Region Terrane, Norway

Journal Article · · Geochemistry, Geophysics, Geosystems
ORCiD logo [1]; ORCiD logo [2];  [3];  [2]
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); University of Nevada, Reno, NV (United States)
  2. University of Nevada, Reno, NV (United States)
  3. Washington State University, Pullman, WA (United States); University of Western Australia, Perth (Australia)

Dehydration reactions within subducted oceanic crust are important for fluid-mediated element transfer within the subducting plate and potentially to the mantle wedge. The effects of metamorphic reactions and fluid flow on element recycling that occur during retrogression and exhumation of subducted continental crust from mantle depths are poorly understood. We study two metabasite pods with fresh eclogite cores and retrogressed amphibolite-facies rims and surrounding host gneiss within the Western Gneiss Region (WGR), Norway, to better understand element mobility and mass transfer during exhumation of subducted continental crust. Bulk-rock data were collected from samples taken across the pod and into the host gneiss. Phengite breakdown in eclogite and epidote recrystallization in veins and/or gneiss within pod cores contributed large ion lithophile elements and REE to retrogressed eclogite closest to the pod cores. In gneiss hosting the pods, phengite and epidote breakdown provided fluid that mediated elemental transfer and redistribution to the pod rim or tail. Compared to the studied pod in the southern WGR, the pod in the northern WGR underwent higher P-T conditions, partial melting and higher strain rates. This resulted in the infiltration of external fluid farther into the pod interior from the rim and facilitated larger mass gain in trace elements in the amphibolite tail of the pod relative to fresh eclogite in the core. The results show clear evidence for retrogression dehydration reactions driving significant fluid-mediated element redistribution as observed on the outcrop scale during exhumation following ultrahigh-pressure metamorphism, which directly impacts element signatures within the exhuming crust.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Swiss National Science Foundation
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2367386
Report Number(s):
LLNL--JRNL-863487; {1096535,"Journal ID: ISSN 1525-2027"}
Journal Information:
Geochemistry, Geophysics, Geosystems, Journal Name: Geochemistry, Geophysics, Geosystems Journal Issue: 3 Vol. 25; ISSN 1525-2027
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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