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https://doi.org/10.5194/se-2020-69
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-69
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 25 May 2020

Submitted as: research article | 25 May 2020

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This preprint is currently under review for the journal SE.

Spatiotemporal history of fluid-fault interaction in the Hurricane fault zone, western USA

Jace M. Koger and Dennis L. Newell Jace M. Koger and Dennis L. Newell
  • Department of Geosciences, Utah State 5 University, Logan, UT 84322, USA

Abstract. The Hurricane Fault is a ~250-km-long, west-dipping normal fault located along the transition between the Colorado Plateau and Basin and Range tectonic provinces in the western U.S. Extensive evidence of fluid-fault interaction, including calcite mineralization and veining, occur in the footwall damage zone. Calcite vein carbon (δ13CVPDB) and oxygen (δ18OVPDB) stable isotope ratios range from −4.5 to 3.8 ‰ and −22.1 to −1.1 ‰, respectively. Fluid inclusion microthermometry constrain paleofluid temperatures and salinities from 45–160 °C and 1.4–11.0 wt % as NaCl, respectively. These data identify mixing between two primary fluid sources including infiltrating meteoric groundwater (70 ± 10 °C, ~1.5 wt % NaCl, δ18OSMOW ~−10 ‰) and sedimentary brine (100 ± 25 °C, ~11 wt % NaCl, δ18OSMOW ~5 ‰). Interpreted carbon sources include crustal- or magmatic-derived CO2, carbonate bedrock, and hydrocarbons. U-Th dates from 5 calcite vein samples indicates punctuated fluid-flow and fracture healing at 539 ± 10.8, 287.9 ± 5.8, 86.2 ± 1.7, and 86.0 ± 0.2 ka in the upper 300 m of the crust. Collectively, the data imply that the Hurricane Fault imparts a strong influence on regional flow of crustal fluids, and that the formation of veins in the shallow parts of the fault damage zone has important implications for the evolution of fault strength and permeability.

Jace M. Koger and Dennis L. Newell

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Jace M. Koger and Dennis L. Newell

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Calcite vein C and O stable isotope values, fluid inclusion microthermometry, and U-Th dates from the Hurricane Fault zone, Utah and Arizona, USA. D. L. Newell and J. M. Koger https://doi.org/10.26022/IEDA/111542

Jace M. Koger and Dennis L. Newell

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