Style and age of late Oligocene‐early Miocene deformation in the southern Stillwater Range, west central Nevada: Paleomagnetism, geochronology, and field relations

Hudson, Mark R.; John, David A.; Conrad, James E.; McKee, Edwin H.

doi:10.1029/1999jb900338

Cited by 23 publications

(33 citation statements)

References 79 publications

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“…It is starkly at odds, however, with the rapid (strain rate >10 13 ), large magnitude (>100%) extension inferred to have taken place at 24.3 Ma in the southern Stillwater Range (Fig. 1) (Hudson et al, 2000). If signifi cant Oligocene extension did take place in the southern Stillwater Range, then a profound structural transition zone must exist between there and the East Range.…”

Section: Tertiary Extension and Volcanismmentioning

confidence: 95%

“…17-15 Ma (Proffett, 1977;Dilles and Gans, 1995;Faulds et al, 2005;Miller et al, 1999;Snow and Wernicke, 2000;Stockli, 2005;Colgan et al, 2008). The spatial distribution of strain during this period was strongly heterogeneous, with highly extended domains (up to 100% strain or more) separated by relatively undeformed blocks of crust (e.g., Miller et al, 1999;Hudson et al, 2000). In contrast, a large area of western and northwestern Nevada remained essentially undeformed until ca.…”

Section: Introductionmentioning

confidence: 95%

“…1) lie south and east of the area where extensional faulting is known to have begun in the late Miocene, and north and west of moderately to highly extended regions like the Stillwater Range (Hudson et al, 2000) and the Shoshone and northern Toiyabe Ranges (Smith et al, 1991;Colgan et al, 2008) (Fig. 1).…”

Section: Introductionmentioning

confidence: 96%

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Miocene extension in the East Range, Nevada: A two-stage history of normal faulting in the northern Basin and Range

Fosdick

Colgan

2008

Geological Society of America Bulletin

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The East Range in northwestern Nevada is a large, east-tilted crustal block bounded by west-dipping normal faults. Detailed mapping of Tertiary stratigraphic units demonstrates a two-phase history of faulting and extension. The oldest sedimentary and volcanic rocks in the area record cumulative tilting of ~30°-45°E, whereas younger olivine basalt fl ows indicate only a 15°-20°E tilt since ca. 17-13 Ma. Cumulative fault slip during these two episodes caused a minimum of 40% extensional strain across the East Range, and Quaternary fault scarps and seismic activity indicate that fault motion has continued to the present day. Apatite fi ssion track and (U-Th)/ He data presented here show that faulting began in the East Range ca. 17-15 Ma, coeval with middle Miocene extension that occurred across much of the Basin and Range. This phase of extension occurred contemporaneously with middle Miocene volcanism related to the nearby northern Nevada rifts, suggesting a link between magmatism and extensional stresses in the crust that facilitated normal faulting in the East Range.Younger fault slip, although less well constrained, began after 10 Ma and is synchronous with the onset of low-magnitude extension in many parts of northwestern Nevada and eastern California. These fi ndings imply that, rather than migrating west across a discrete boundary, late Miocene extension in western Nevada is a distinct, younger period of faulting that is superimposed on the older, middle Miocene distribution of extended and unextended domains. The partitioning of such middle Miocene deformation may refl ect the infl uence of localized heterogeneities in crustal structure, whereas the more broadly distributed late Miocene extension may refl ect a stronger infl uence from regional plate boundary processes that began in the late Miocene.

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Section: Tertiary Extension and Volcanismmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

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Miocene extension in the East Range, Nevada: A two-stage history of normal faulting in the northern Basin and Range

Fosdick

Colgan

2008

Geological Society of America Bulletin

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“…19-14 Ma (Miller et al, 1999;Stockli, 1999;Stockli et al, 2001;Surpless et al, 2002). In many areas, these ranges cut and uplifted older extensional terranes that formed in the Eocene to early Miocene (e.g., Smith, 1992;Miller et al, 1999;Hudson et al, 2000;Egger et al, 2003;Howard, 2003), and the magnitude of Cenozoic extension totals 50%-100% (Smith et al, 1991). More recent (<12 Ma) Basin and Range extensional faulting has been concentrated largely at the eastern and western margins of the province and has generally involved more limited amounts of extension (e.g., Gilbert and Reynolds, 1973;Dilles and Gans, 1995;Armstrong et al, 2003;Stockli et al, 2003).…”

Section: Introductionmentioning

confidence: 97%

Timing of Cenozoic volcanism and Basin and Range extension in northwestern Nevada: New constraints from the northern Pine Forest Range

Colgan

Dumitru

McWilliams

et al. 2006

Geological Society of America Bulletin

101

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Eocene-middleMiocene volcanic rocks in the northern Pine Forest Range, Nevada, are ideally situated for reconstructing the timing and style of volcanism and extensional faulting in the northwesternmost part of the Basin and Range province. A conformable sequence of Cenozoic volcanic and sedimentary strata in the northern Pine Forest Range dips ~30°W, and 11 new 40 Ar/ 39 Ar ages from this sequence defi ne 3 major episodes of volcanic activity. Pre-Tertiary basement and older (ca. 38 Ma) Tertiary intrusive rocks are overlain unconformably by Oligocene (ca. 30-23 Ma) basalt fl ows and dacitic to rhyolitic ash-fl ow tuffs interbedded with fi ne-grained tuffaceous sedimentary rocks. Oligocene rocks are overlain by ~550 m of ca. 17-16 Ma basalt fl ows equivalent to the Steens Basalt in southern Oregon, and basalt fl ows are capped by a thin 16.3 Ma ignimbrite that likely is correlative with either the Idaho Canyon Tuff or the Tuff of Oregon Canyon. The northern Pine Forest Range is bounded to the east by a major down-to-the-east normal fault that dips ~40°E with well-developed fault striations indicative of dip-slip motion. This fault initiated at an angle of ~70° and was rotated ~30° during uplift of the range. A suite of 17 apatite fi ssion-track ages from the Pine Forest footwall block demonstrates that exhumation, uplift, and slip on the range-bounding fault began ca. 12-11 Ma and continued until at least 7 Ma, with moderate slip since then. The Pine Forest Range did not undergo signifi cant extension before or during peakOligocene and Miocene volcanism, and similar geologic relationships in nearby ranges suggest that a larger region of northwestern Nevada was also little extended during this interval. Basin and Range faulting in northwestern Nevada appears to have begun no earlier than 12 Ma, making it distinctly younger than deformation in much of central and southern Nevada, where peak extension occurred in the middle Miocene or earlier.

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“…Li et al (1990) reported 19°CCW rotation of Mid-Miocene dikes and flows from the northern Nevada Rift, immediately N of the study area in the Cortez Range and nearby regions. In central west Nevada, west of the study area, CCW rotations of 25°to more than 30°have been reported for ignimbrites of the Dixie Valley region and Stillwater Range Geissman, 1987, 1991;Hudson et al, 2000). The age of rotation in those studies is thought to be mainly Early to Mid-Miocene.…”

Section: Tectonic Implicationsmentioning

confidence: 94%

Insights into deposition and deformation of intra-caldera ignimbrites, central Nevada

MacDonald¹,

Palmer²,

Deino³

et al. 2012

Journal of Volcanology and Geothermal Research

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Style and age of late Oligocene‐early Miocene deformation in the southern Stillwater Range, west central Nevada: Paleomagnetism, geochronology, and field relations

Cited by 23 publications

References 79 publications

Miocene extension in the East Range, Nevada: A two-stage history of normal faulting in the northern Basin and Range

Miocene extension in the East Range, Nevada: A two-stage history of normal faulting in the northern Basin and Range

Timing of Cenozoic volcanism and Basin and Range extension in northwestern Nevada: New constraints from the northern Pine Forest Range

Insights into deposition and deformation of intra-caldera ignimbrites, central Nevada

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