Geochemical constraints on the origin of thrust fault fluids

Details Geochemical constraints on the origin of thrust fault fluids Geochemical constraints on the origin of thrust fault fluids

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3665d&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 24, p. 3665-3668

Mathematics

Logic

Geochemistry: Isotopic Composition/Chemistry, Structural Geology: Role Of Fluids

Scientific paper

The character and origin of Sevier Cordilleran thrust fault fluids was investigated through the analysis of Sr, O, and C isotope ratios in thrust fault breccia matrix. Breccia matrix has depleted oxygen, depleted carbon and more radiogenic strontium when compared to undeformed rocks. This isotope chemistry indicates that meteoric waters descended below the horizon of thrusting and interacted with rocks that released radiogenic Sr to the fluid. The fluids subsequently ascended into the thrust faults where they imparted their unique isotopic signature to the matrix of the recrystallizing thrust fault breccia. The similar trends in isotope chemistry of thrust fault breccias along geographically far-spaced locations of the Cordilleran thrust belt indicates that a common hydrologic regime was operating during Sevier deformation.

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