Mineral-Filled Fractures as Indicators of Multigenerational Fluid Flow in the Pahrump Hills Member of the Murray Formation, Gale Crater, Mars

Kronyak, R. E.; Kah, L. C.; Edgett, K. S.; VanBommel, S. J.; Thompson, L. M.; Wiens, R. C.; Sun, V. Z.; Nachon, M.

doi:10.1029/2018ea000482

Mineral-Filled Fractures as Indicators of Multigenerational Fluid Flow in the Pahrump Hills Member of the Murray Formation, Gale Crater, Mars

Journal Article · Fri Jan 18 04:00:00 EST 2019 · Earth and Space Science

DOI:https://doi.org/10.1029/2018ea000482· OSTI ID:1734722

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Univ. of Tennessee, Knoxville, TN (United States)
Malin Space Science Systems, San Diego, CA (United States)
Univ. of Guelph, ON (Canada)
Univ. of New Brunswick, Fredericton NB (Canada)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
Univ. of California, Davis, CA (United States)

Mineral-filled fractures (veins) are valuable indicators of deformation and fluid flow within a sedimentary package. Information obtained from vein morphology, texture, and chemistry may elucidate the sequence and nature of postdepositional fluid events. Additional information from vein patterns and interactions between veins and host rock provides insight into fracture formation mechanism(s). The widespread occurrence of veins and other diagenetic features in the sedimentary rock record preserved in Gale crater, Mars, indicates that postdepositional fluids were regionally active considerably later in time than the primary fluviolacustrine environments responsible for the deposition of Mount Sharp strata. Here we report a suite of veins within the Murray formation at the Pahrump Hills locality that were investigated using the scientific payload of the Mars Science Laboratory Curiosity rover. Based on an analysis of vein color, morphology, and texture, and corroborated by vein chemistry, we interpret three distinct vein types at Pahrump Hills: gray veins, white veins, and dark-toned veins. These veins represent distinct, separate episodes of postdepositional fluid flow, suggesting a protracted history of fluid stability in Gale crater. Additionally, we utilize vein patterns across multiple lithologies at the Pahrump Hills field site to suggest hydrofracture as the primary mechanism of fracture formation.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Aeronautic and Space Administration (NASA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1734722

Report Number(s):: LA-UR--19-32325

Journal Information:: Earth and Space Science, Journal Name: Earth and Space Science Journal Issue: 2 Vol. 6; ISSN 2333-5084

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Mineral-Filled Fractures as Indicators of Multigenerational Fluid Flow in the Pahrump Hills Member of the Murray Formation, Gale Crater, Mars

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