Margin of the North American continent in Nevada during Late Cambrian time

Rowell, A. J.; Rees, Margaret N.; Suczek, Christopher A.

doi:10.2475/ajs.279.1.1

Cited by 13 publications

(9 citation statements)

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“…Harmony B detritus was most likely shed from basement rocks exposed along the northern part of the continental margin, and was transported southward by turbidity currents to a site of accumulation offshore from present-day western Nevada. This is similar to the model of Suczek (1977), Stewart and Suczek (1977), Rowell et al (1979), and Schweickert and Snyder (1981), except that the distance of transport is considerably greater. Cambrian(?)…”

Section: Provenance Implicationssupporting

confidence: 64%

“…A second group, which is apparently the dominant component in the Harmony Formation, yields >1.75 Ga ages that were most likely derived from a westward continuation of the Peace River arch along the Canadian continental margin. This requires ~1200 km of southward transport, which, following the ideas of Suczek (1977), Stewart and Suczek (1977), Rowell et al (1979), and Schweickert and Snyder (1981), is interpreted to have occurred by southward-flowing turbidity currents in a broad submarine fan. The depositional contact between the two sandstone types in the Harmony indicates that the Harmony Formation contains remnants of two overlapping submarine fan systems that were shed from two very different portions of the Cordilleran margin.…”

Section: Discussionmentioning

confidence: 95%

“…Alternatively, detritus in the Harmony Formation may have been derived from basement rocks exposed along the continental margin. Suczek (1977), Stewart and Suczek (1977), Rowell et al (1979), and Schweickert and Snyder (1981) proposed that detritus in the Harmony Formation originated in the Salmon River arch region of Idaho ( Fig. 1), because Precambrian basement in that region was apparently exposed and was a source of feldspathic detritus during Cambrian time.…”

Section: Harmony Formationmentioning

confidence: 97%

“…3 and 4) is a distinctive sequence of poorly sorted feldspathic and micaceous sandstone and siltstone, with subordinate limestone and shale, that accumulated in a submarine fan setting (Suczek, 1977;Rowell et al, 1979). Sandstones consisting of monocrystalline and polycrystalline quartz, white mica and biotite, and both potassium feldspar (mainly perthite and microcline) and plagioclase (mainly albite) make up most of the unit (Suczek, 1977;Madrid, 1987).…”

Section: Harmony Formationmentioning

confidence: 98%

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Detrital zircon geochronology of the Roberts Mountains allochthon, Nevada

Gehrels

Dickinson

Riley

et al. 2000

Paleozoic and Triassic Paleogeography and Tectonics of Western Nevada and Northern California

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U-Pb geochronologic analyses have been conducted on 205 individual detrital zircon grains from Cambrian through Devonian sandstones of the RobertsMountains allochthon in central Nevada. These strata were tectonically emplaced onto the Cordilleran margin during the mid-Paleozoic Antler orogeny, but their original depositional settings and provenance have been controversial. Our data, combined with previous detrital zircon studies, define four different age signatures for the eugeoclinal strata: (1) 690-7 15 and 1065-1350 Ma grains in a minor group of sandstones in the Upper Cambrian(?) Harmony Formation, (2) 1745-Comparison of these data with the detrital zircon reference for the Cordilleran miogeocline and with ages of basement provinces in cratonal North America indicates that sandstones in the lower Vinini and parts of the Harmony Formations were derived from 1.0-1.3,~1.43, and 1.6-1.8 Ga provinces of southwestern North America. In contrast, most older and younger units contain few grains of the appropriate ages to have come from the southwestern part of North America, and instead have strong similarities with the Peace River arch region of western Canada.We propose that detritus in most of the Harmony Formation was shed from off-shelf basement rocks exposed along the Canadian continental margin, perhaps as a western continuation of the Peace River arch or as extensional fault blocks. In contrast, detritus

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Section: Provenance Implicationssupporting

confidence: 64%

Section: Discussionmentioning

confidence: 95%

Section: Harmony Formationmentioning

confidence: 97%

Section: Harmony Formationmentioning

confidence: 98%

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Detrital zircon geochronology of the Roberts Mountains allochthon, Nevada

Gehrels

Dickinson

Riley

et al. 2000

Paleozoic and Triassic Paleogeography and Tectonics of Western Nevada and Northern California

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“…3) distributed from the Antler-Sonoma foreland westward to central Nevada (Stewart and Carlson, 1976;Stewart, 1980). The superposed Roberts Mountains and Golconda allochthons were derived in bulk from an oceanic region (Dickinson, 2000) that lay beyond the offshore limit of the miogeoclinal belt (Rowell et al, 1979). Disparate paleogeographic origins for the two allochthons are confi rmed by the ages of detrital zircons in deformed sedimentary assemblages of both allochthons, which generally lack zircons comparable in age to those present in sandstones of the underlying miogeocline derived from the adjacent craton (Gehrels and Dickinson, 1995;Dickinson and Gehrels, 2000).…”

Section: Antler-sonoma Obductionmentioning

confidence: 99%

Geotectonic evolution of the Great Basin

2006

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The crust of the Great Basin has occupied a range of tectonic settings through geologic time. Archean and Paleoproterozoic crustal genesis preceded residence of Laurentia within the Mesoproterozoic supercontinent Rodinia, which rifted in the late Neoproterozoic to delineate the Cordilleran fl ank of Laurentia. Successive stages of Phanerozoic evolution included (1) early to middle Paleozoic miogeoclinal sedimentation along a passive continental margin, (2) late Paleozoic to earliest Mesozoic thrusting of oceanic Antler and Sonoma allochthons over the continental margin in response to episodic slab rollback beneath an offshore Klamath-Sierran islandarc complex, (3) Mesozoic to mid-Cenozoic arc-rear and backarc thrusting, together with pulses of interior magmatism, associated with development of the Cordilleran magmatic arc to the west where subduction and arc accretion expanded the continental margin, and (4) middle to late Cenozoic crustal extension, which involved initial intra-arc to backarc deformation and later transtensional torsion of the continental block inland from the evolving San Andreas transform system. Potential metallogenic infl uences on Great Basin tectonic evolution included transfer of substance from mantle to crust by magmatism and associated metasomatism, and reworking of crustal materials by both magmatism and intracrustal fl uid fl ow, the latter of which was induced both by thermal effects of magmatism and by reconfi guration of fl uid-bearing rock masses during multiple episodes of Great Basin deformation.

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Three‐Dimensional Evolution of the Early Paleozoic Western Laurentian Margin: New Insights From Detrital Zircon U‐Pb Geochronology and Hf Isotope Geochemistry of the Harmony Formation of Nevada

et al. 2017

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Uranium‐lead (U‐Pb) geochronology and Hafnium (Hf) isotope geochemistry of detrital zircons of the Harmony Formation of north central Nevada provide new insights into the tectonic evolution of the Late Paleozoic western Laurentian margin. Using laser‐ablation inductively coupled plasma mass spectrometry, 10 arenite samples were analyzed for U‐Pb ages, and 8 of these samples were further analyzed for Hf isotope ratios. Three of the sampled units have similar U‐Pb age peaks and Hf isotope ratios, including a 1.0–1.4 Ga peak with εHf values of +12 to −3 and a 2.5–2.7 Ga peak with εHf values of +7 to −5. The remaining seven samples differ significantly from these three, but are similar to one another; having age peaks of 1.7–1.9 Ga with εHf of +10 to −20 and age peaks of 2.3–2.7 Ga with εHf of +6 to −8. The data confirm the subdivision of the Harmony Formation into two petrofacies: quartzose (Harmony A) and feldspathic (Harmony B). The three samples with 1.0–1.4 and 2.5–2.7 Ga peaks are the Harmony A, which originated in the central Laurentian craton. The other seven samples are the Harmony B, which originated in eastern Alberta‐western Saskatchewan, north of the Harmony A source. We propose that all Harmony Formation strata were deposited near eastern Alberta and subsequently tectonically interleaved with Roberts Mountains allochthon strata. We interpret that the entire package was tectonically transported south along the western Laurentian margin and then emplaced eastward onto the craton during the Late Devonian‐Early Mississippian Antler orogeny.

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Margin of the North American continent in Nevada during Late Cambrian time

Cited by 13 publications

References 0 publications

Detrital zircon geochronology of the Roberts Mountains allochthon, Nevada

Detrital zircon geochronology of the Roberts Mountains allochthon, Nevada

Geotectonic evolution of the Great Basin

Three‐Dimensional Evolution of the Early Paleozoic Western Laurentian Margin: New Insights From Detrital Zircon U‐Pb Geochronology and Hf Isotope Geochemistry of the Harmony Formation of Nevada

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