2016
DOI: 10.1130/ges01143.1
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Paleogeographic implications of late Miocene lacustrine and nonmarine evaporite deposits in the Lake Mead region: Immediate precursors to the Colorado River

Abstract: Thick late Miocene nonmarine evaporite (mainly halite and gypsum) and related lacustrine limestone deposits compose the upper basin fill in half grabens within the Lake Mead region of the Basin and Range Province directly west of the Colorado Plateau in southern Nevada and northwestern Arizona. Regional relations and geochronologic data indicate that these deposits are late synextensional to postextensional (ca. 12-5 Ma), with major extension bracketed between ca. 16 and 9 Ma and the abrupt western margin of t… Show more

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Cited by 16 publications
(10 citation statements)
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References 129 publications
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“…These basins formed at the major onset of extension ca. 17 Ma (Faulds et al, 2016). The Hualapai Limestone provides a record of a spring-fed lake (Lake Hualapai) in Grand Wash Trough that persisted from 13 Ma until the 6-4.5 Ma arrival of the CR (Spencer et al, 2001;Crossey et al, 2015).…”
Section: Pre-6 Ma Landscapementioning
confidence: 99%
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“…These basins formed at the major onset of extension ca. 17 Ma (Faulds et al, 2016). The Hualapai Limestone provides a record of a spring-fed lake (Lake Hualapai) in Grand Wash Trough that persisted from 13 Ma until the 6-4.5 Ma arrival of the CR (Spencer et al, 2001;Crossey et al, 2015).…”
Section: Pre-6 Ma Landscapementioning
confidence: 99%
“…Thick deposits of gypsum in the northern Grand Wash Trough provide evidence for internal drainage until ca. 5 Ma (Faulds et al, 2016). A stream entering Grand Wash from the north likely eroded headward until reaching the Canaan Peak Formation exposed on the southeastern flanks of the Pine Valley Mountains.…”
Section: Integration and Birth Of The Virgin Rivermentioning
confidence: 99%
“…The timing of river arrival to the same general area is further constrained to before 4.49 ± 0.46 Ma based on 40 Ar/ 39 Ar dating of the Sandy Point basalt, which overlies river gravel ( Fig. 2) (Faulds et al, 2001(Faulds et al, , 2016. These are important geologic constraints that must be honored in any model of the processes by which the Colorado River came to occupy its current position and carve Grand Canyon (e.g., Blackwelder, 1934;Hunt, 1969;Hill et al, 2008;Pederson, 2008;Polyak et al, 2008;Wernicke, 2011;Karlstrom et al, 2014).…”
Section: ■ Background Lower Colorado River Evolution and Depositsmentioning
confidence: 99%
“…Available age control suggests that Bullhead aggradation was already underway in what is now the Lake Mead area by ca. 4.5 Ma (Faulds et al, 2016). Tephrochronology indicates that Bullhead aggradation culminated in Mohave Valley soon after 4.1 Ma and that the aggradation package had been partially dissected by 3.3 Ma (House et al, 2008;Howard et al, 2015).…”
Section: ■ Background Lower Colorado River Evolution and Depositsmentioning
confidence: 99%
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