Physics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4295b&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 22, p. 4295-4298
Physics
1
Geochemistry: Isotopic Composition/Chemistry, Structural Geology: Folds And Folding, Structural Geology: Fractures And Faults, Structural Geology: Role Of Fluids
Scientific paper
Mississippian carbonates in the Sevier thrust belt in Idaho-Montana show shifts in δ18OV-SMOW, from marine carbonate values to as low as +11‰, which are best explained by exchange with externally-derived, low-δ18O fluids. Late-stage, synkinematic calcite veins are depleted in 18O relative to the host-rocks and earlier-formed veins, many having δ18O of +5 to +10‰. These veins could have equilibrated with H2O with δ18O of -7.5 to +2.5‰, perhaps reflecting infiltration of the Sevier thrust wedge by nearshore meteoric waters to depths of ~10 km. Calcite veins in the hangingwall and footwall of the Pioneer Metamorphic Core Complex, produced during later Paleogene extension, have δ18O of -8.7 to +1.4‰ consistent with equilibration with meteoric waters with δ18O as low as -14‰. Transition from a Cretaceous crustal fluid regime influenced by the nearby Western Interior Seaway to one influenced by lower-δ18O, more inland meteoric waters is consistent with seaway retreat during thrust wedge emergence and Paleogene uplift and subaerial volcanism.
Anastasio David J.
Bebout Gray E.
Holl James E.
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