@article{ac38a87e0ce749c694e660ca756f0eab,
title = "Eocene fault-controlled fluid flow and mineralization in the Paradox Basin, United States",
abstract = "Sedimentary rocks of the Paradox Basin of the Colorado Plateau (southwestern USA) record widespread manifestations of paleo–fluid flow and fluid-rock reactions including Cu, U-V, and Fe-Mn mineral deposits, Si and Ca metasomatism, hydrocarbon accumulations, and bleached sandstones. Many of these are spatially associated with faults. Here we show evidence for a widespread phase of fault-related fluid migration and mineralization at 41–48 Ma in the Paradox Basin. We measured K-Ar dates of multiple size fractions of clay-rich fault gouge, yielding statistically overlapping dates of authigenic (1Md) illite for the Salt Valley (47.0 ± 3.0 Ma), Kane Springs (47.7 ± 3.8 Ma), Cliffdweller (43.4 ± 4.6 Ma), Courthouse (41.9 ± 2.3 Ma), Lisbon Valley (45.3 ± 0.9 Ma), and GTO (48.1 ± 2.6 Ma) faults. The latter two have an illite Rb-Sr isochron age of 50.9 ± 3.5 Ma, and fault-adjacent bornite has a Re-Os isochron age of 47.5 ± 1.5 Ma. Authigenic illite from a paleo–oil reservoir near the Courthouse fault formed from the interaction of reduced fluids with oxidized red-bed sandstones at 41.1 ± 2.5 Ma. The Moab and Keystone faults have older authigenic illite ages of 59.1 ± 5.7 Ma and 65.2 ± 1.0 Ma, respectively.",
author = "Bailey, {Lydia R.} and Jason Kirk and Hemming, {Sidney R.} and Krantz, {Robert W.} and Reiners, {Peter W.}",
note = "Funding Information: Funding was provided by the W.M. Keck Foundation (Los Angeles, California, USA) and a Geological Society of America Student Research Grant. We acknowledge Juliet Crider and Mark Fischer for constructive reviews, and Lantz Indergard (Lisbon Valley Mining Co., La Sal, Utah), Carson Broaddus, Mark Barton, and Isabel Barton for help with sampling. We thank Uttam Chowdhury, Mary Kay Amistadi, and Tanzhuo Liu for laboratory assistance, and John Solum for providing illite XRD structure files. Funding Information: Funding was provided by the W.M. Keck Foundation (Los Angeles, California, USA) and a Geological Society of America Student Research Grant. We acknowledge Juliet Crider and Mark Fischer for constructive reviews, and Lantz Indergard (Lisbon Valley Mining Co., La Sal, Utah), Carson Broaddus, Mark Barton, and Isabel Barton for help with sampling. We thank Uttam Chowdhury, Mary Kay Amistadi, and Tanzhuo Liu for laboratory assistance, and John Solum for providing illite XRD structure files Publisher Copyright: {\textcopyright} 2022 Geological Society of America",
year = "2022",
doi = "10.1130/G49466.1",
language = "English (US)",
volume = "50",
pages = "326--330",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "3",
}