Chronology of polyphase extension in the Windermere Hills, northeast Nevada

Mueller, Karl; Cerveny, Philip K.; Perkins, Michael E.; Snee, Lawrence W.

doi:10.1130/0016-7606(1999)111<0011:copeit>2.3.co;2

Cited by 27 publications

(16 citation statements)

References 33 publications

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“…Lacustrine deposits fall into two age groups: older than ca. 40 Ma in the Elko Hills and at Double Mountain, Coal Mine Canyon, and Copper Basin (Haynes et al, 2002;Rahl et al, 2002;Haynes, 2003;Henry, 2008; this report) and ≤38-35 Ma in the Windermere Hills (Mueller et al, 1999). These deposits are ~600 m thick in the Elko Hills and a few hundreds of meters thick elsewhere (Solomon et al, 1979;Mueller et al, 1999;Haynes, 2003;Henry, 2008).…”

Section: Evidence From Eocene Paleovalleys and Ash-flow Tuffs (Cd Hmentioning

confidence: 89%

“…The 46-39 Ma Elko Formation in the Elko Hills shows no fanning of dips (Haynes, 2003), which indicates no tilting and probably relatively little extension during its deposition. Similarly, Eocene and Miocene deposits are concordant in most areas of northeastern Nevada (Best and Christiansen, 1991;Thorman et al, 1991;Mueller, 1993;Brooks et al, 1995a;Mueller et al, 1999;Henry, 2008), which precludes signifi cant tilting and extension.…”

Section: Evidence From Eocene Paleovalleys and Ash-flow Tuffs (Cd Hmentioning

confidence: 94%

“…What may be a branch of the central paleovalley passes through the Windermere Hills, where Mueller et al (1999) interpreted Eocene sedimentary rocks to fi ll a half-graben above an east-rooted, Eocene low-angle detachment fault. Henry (2008) interpreted the same deposits to fi ll an east-draining paleovalley, consistent with cobble imbrications found by Mueller (1992), but probably dammed during small-magnitude Eocene extension.…”

Section: Paleozoic-mesozoic Contraction and Crustal Thickening And Pamentioning

confidence: 99%

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Timing, distribution, amount, and style of Cenozoic extension in the northern Great Basin

Henry¹,

McGrew²,

Colgan³

et al. 2011

Geologic Field Trips to the Basin and Range, Rocky Mountains, Snake River Plain, and Terranes of the U.S. Cordillera

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This fi eld trip examines contrasting lines of evidence bearing on the timing and structural style of Cenozoic (and perhaps late Mesozoic) extensional deformation in northeastern Nevada. Studies of metamorphic core complexes in this region report extension beginning in the early Cenozoic or even Late Cretaceous, peaking in the Eocene and Oligocene, and being largely over before the onset of "modern" Basin and Range extension in the middle Miocene. In contrast, studies based on low-temperature thermochronology and geologic mapping of Eocene and Miocene volcanic and sedimentary deposits report only minor, localized extension in the Eocene, no extension at all in the Oligocene and early Miocene, and major, regional extension in the middle Miocene.A wealth of thermochronologic and thermobarometric data indicate that the Ruby Mountains-East Humboldt Range metamorphic core complex (RMEH) underwent ~170 °C of cooling and 4 kbar of decompression between ca. 85 and ca. 50 Ma, and another 450 °C cooling and 4-5 kbar decompression between ca. 50 and ca. 21 Ma. These data require ~30 km of exhumation in at least two episodes, accommodated at least in part by Eocene to early Miocene displacement on the major west-dipping mylonitic zone and detachment fault bounding the RMEH on the west (the mylonitic zone may also have been active during an earlier phase of crustal extension). Meanwhile, Eocene paleovalleys containing 45-40 Ma ash-fl ow tuffs drained eastward from

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Section: Evidence From Eocene Paleovalleys and Ash-flow Tuffs (Cd Hmentioning

confidence: 89%

Section: Evidence From Eocene Paleovalleys and Ash-flow Tuffs (Cd Hmentioning

confidence: 94%

Section: Paleozoic-mesozoic Contraction and Crustal Thickening And Pamentioning

confidence: 99%

See 1 more Smart Citation

Timing, distribution, amount, and style of Cenozoic extension in the northern Great Basin

Henry¹,

McGrew²,

Colgan³

et al. 2011

Geologic Field Trips to the Basin and Range, Rocky Mountains, Snake River Plain, and Terranes of the U.S. Cordillera

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“…A major episode of extension began in the middle Miocene across most of northern Nevada, although the amount of extension varied greatly across the region (Proffett, 1977;Best and Christiansen, 1991;Surpless et al, 2002;Colgan et al, 2008Colgan et al, , 2010Henry, 2008;Colgan and Henry, 2009;Henry and Faulds, 2010;Henry et al, 2011). Many geologists interpret major pre-and/or syn-ignimbrite fl areup extension (Gans et al, 1989;Seedorff, 1991;Smith, 1992;McGrew and Snee, 1994;Dilles and Gans, 1995;Mueller et al, 1999;McGrew et al, 2000;Druschke et al, 2009). However, the lack of angular unconformities between Cenozoic tuffs, continuity of ash-fl ow tuffs in paleovalleys across areas of major extension, and the paucity of early or middle Cenozoic sedimentary deposits in the caldera belt indicate that pre-or syn-ignimbrite fl areup extension was minor and/or exceedingly local (Best and Christiansen, 1991;Henry, 2008;Colgan and Henry, 2009;Long, 2012).…”

Section: Crustal-tectonic Setting and Evolution Of Western Nevadamentioning

confidence: 99%

Magmatism, ash-flow tuffs, and calderas of the ignimbrite flareup in the western Nevada volcanic field, Great Basin, USA

2013

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The western Nevada volcanic fi eld is the western third of a belt of calderas through Nevada and western Utah. Twenty-three calderas and their caldera-forming tuffs are reasonably well identifi ed in the western Nevada volcanic fi eld, and the presence of at least another 14 areally extensive, apparently voluminous ash-fl ow tuffs whose sources are unknown suggests a similar number of undiscovered calderas. Eruption and caldera collapse occurred between at least 34.4 and 23.3 Ma and clustered into fi ve ~0.5-2.7-Malong episodes separated by quiescent periods of ~1.4 Ma. One eruption and caldera collapse occurred at 19.5 Ma. Intermediate to silicic lavas or shallow intrusions commonly preceded caldera-forming eruptions by 1-6 Ma in any specifi c area. Caldera-related as well as other magmatism migrated from northeast Nevada to the southwest through time, probably resulting from rollback of the formerly shallow-dipping Farallon slab. Calderas are restricted to the area northeast of what was to become the Walker Lane, although intermediate and effusive magmatism continued to migrate to the southwest across the future Walker Lane. Most ash-fl ow tuffs in the western Nevada volcanic fi eld are rhyolites, with approximately equal numbers of sparsely porphyritic (≤15% phenocrysts) and abundantly porphyritic (~20-50% phenocrysts) tuffs. Both sparsely and abundantly porphyritic rhyolites commonly show compositional or petrographic evidence of zoning to trachydacites or dacites. At least four tuffs have volumes greater than 1000 km 3 , with one possibly as much as ~3000 km 3. However, the volumes of most tuffs are diffi cult to estimate, because many tuffs primarily fi lled their source calderas and/or fl owed and were deposited in paleovalleys, and thus are irregularly distributed.

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“…Sampling in the eastern Windermere Hills was guided by the maps of Mueller [1993] and Mueller et al [1999]. The Eocene calc‐alkaline volcanic rocks in this area are dominantly rhyolitic ash flow tuff but a dacitic flow is also present [ Mueller et al , 1999]. These rocks are exposed in a series of west tilted fault blocks that overlie a major shallow detachment fault.…”

Section: Geologic Background and Sampling Strategymentioning

confidence: 99%

The Northeast Nevada Volcanic Field: Magnetic properties and source implications

Palmer

MacDonald

2002

J. Geophys. Res.

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Magnetic susceptibility and remanence studies on late Eocene ash flow deposits of the Northeast Nevada Volcanic Field (NENVF) were undertaken at 39 sites in four sampling localities: Dolly Varden Mountains (20 sites), Nanny Creek area of the Pequop Mountains (11 sites), eastern Windermere Hills (7 sites), and southern Snake Mountains (1 site). These deposits span a narrow age range from 41.08 to 39.08 Ma based on 40Ar/39Ar data [Brooks et al., 1995a, 1995b] and on new K‐Ar ages presented here. Characteristic remanences reveal that all ignimbrites sampled are reversely magnetized. The characteristic directions of remanent magnetization do not significantly deviate from the expected direction computed from the 42 Ma mean pole for North America, indicating that no major vertical axis rotations have affected the sampling regions since Eocene time. Anisotropy of magnetic susceptibility studies, undertaken to decipher flow trends and possible source areas for these ash flow tuff units of the NENVF, are consistent with a source region near the Toano Range. This places the ash flow source area east of Nanny Creek, the type area for the NENVF. The suspected source region lies close to the Wells fault system. However, Tertiary detachment faulting, Basin and Range normal faulting, erosion, and sedimentation have obscured the suspected source region. A more clearly defined zone of Eocene igneous activity, in the central Pilot Range to the east, cannot be ruled out as a potential source area.

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Chronology of polyphase extension in the Windermere Hills, northeast Nevada

Cited by 27 publications

References 33 publications

Timing, distribution, amount, and style of Cenozoic extension in the northern Great Basin

Timing, distribution, amount, and style of Cenozoic extension in the northern Great Basin

Magmatism, ash-flow tuffs, and calderas of the ignimbrite flareup in the western Nevada volcanic field, Great Basin, USA

The Northeast Nevada Volcanic Field: Magnetic properties and source implications

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