SHRIMP U-Pb dating of recurrent Cryogenian and Late Cambrian-Early Ordovician alkalic magmatism in central Idaho: Implications for Rodinian rift tectonics

Lund, Karen; Aleinikoff, John N.; Evans, Karl V.; duBray, E.A.; DeWitt, Ed; Unruh, D. M.

doi:10.1130/b26565.1

Cited by 101 publications

(122 citation statements)

References 96 publications

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“…Harlan et al, 2003;Lund et al, 2010;Park et al, 1995;Whitmeyer and Karlstrom, 2007). In contrast, our results suggest that extensional tectonics in western North America initiated at~800 Ma and are consistent with previous studies that suggest a similar timing based on the intrusion of a basaltic sill in the Purcell-Supergroup in southwestern Alberta at~800 Ma (Goble et al, 1999;Harlan et al, 2003) and the deposition of the Grand Canyon Chuar Group between 800 and 742 Ma (Timmons et al, 2001).…”

Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 95%

“…This transition was followed by the rejuvenation of extensional tectonics and back-arc basin formation (Lund et al, 2010) along the newly formed active margin, presumably due to slab rollback during Late Devonian to Early Carboniferous times (e.g., Colpron et al, 2007;Lund, 2008;Nelson and Colpron, 2007;Roback et al, 1994;Smith and Lambert, 1995). In such a tectonic setting the carbonatites likely intruded in proximity to the continental margin, where continental lithosphere was present (Woolley and Bailey, 2012 and Section 7.3).…”

Section: Devonian To Carboniferous Alkaline Magmatismmentioning

confidence: 96%

“…Timmons et al, 2001). Lund et al (2010) further argue that by~700-685 Ma an interconnected, subsiding, margin-long basin was established and lasted until~570 Ma. Subsequent recurrent rifting along the continental margin led to the deposition of Paleozoic miogeoclinal strata (Fig.…”

Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 97%

“…Subsequent recurrent rifting along the continental margin led to the deposition of Paleozoic miogeoclinal strata (Fig. 1a) and the intrusion of alkalic and ultrapotassic rocks along the Canadian and U.S. miogeocline in the Late Cambrian and late Early Ordovician (Lund et al, 2010;Pyle and Barnes, 2003;this study). In addition, McMillan and McLemore (2004) report repeated extension-related intracratonic alkaline and carbonatite magmatism from the southwestern U.S. between~665 and 425 Ma in an aulacogen setting ( Fig.…”

Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 97%

“…In contrast, our results suggest that extensional tectonics in western North America initiated at~800 Ma and are consistent with previous studies that suggest a similar timing based on the intrusion of a basaltic sill in the Purcell-Supergroup in southwestern Alberta at~800 Ma (Goble et al, 1999;Harlan et al, 2003) and the deposition of the Grand Canyon Chuar Group between 800 and 742 Ma (Timmons et al, 2001). Lund et al (2010) provide a comprehensive overview of Cordilleran extensional history and argue that intermittent extension along the western Laurentian margin at~780, 750, 725, and 700 Ma is indicated by igneous rocks (e.g., Armstrong et al, 1981;Crowley, 1997;Evenchick et al, 1984;Harlan et al, 2003;McDonough and Parrish, 1991;Park et al, 1995;Ross et al, 1995;Whitmeyer and Karlstrom, 2007) that are generally not associated with sedimentary rocks deposited in extensive and interconnected basins, and therefore are interpreted to be manifestations of restricted local extension (cf. Timmons et al, 2001).…”

Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 99%

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U–Th–Pb geochronology of meta-carbonatites and meta-alkaline rocks in the southern Canadian Cordillera: A geodynamic perspective

Millonig

Gerdes

Groat

2012

Lithos

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Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 95%

Section: Devonian To Carboniferous Alkaline Magmatismmentioning

confidence: 96%

Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 97%

Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 97%

Section: Neoproterozic To Late Cambrian Alkaline Magmatismmentioning

confidence: 99%

See 3 more Smart Citations

U–Th–Pb geochronology of meta-carbonatites and meta-alkaline rocks in the southern Canadian Cordillera: A geodynamic perspective

Millonig

Gerdes

Groat

2012

Lithos

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Evidence for a long‐lived accommodation/transfer zone beneath the Snake River Plain: A possible influence on Neogene magmatism?

Konstantinou

Miller

2015

Tectonics

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Geochronologic data compiled from 12 metamorphic core complexes and their flanking regions outline important differences in tectonic and magmatic histories north and south of the Snake River Plain-Yellowstone Province (SRP-Y). Magmatism, crustal flow, metamorphism, and extensional exhumation of core complexes north of the SRP occurred mostly between 55 and 42 Ma as compared to 42-25 Ma south of the SRP, with final exhumation of the southern complexes occurring only during younger Miocene (20-0 Ma) Basin and Range faulting. These significant differences in the timing of events suggest that the now lava-covered SRP, which is at a high angle to Cordilleran trends, may have at times operated as a steep shear or transfer zone accommodating difference in strain to the north and south. Following previous suggestions, we infer that this proposed accommodation or transfer zone developed above an important lithospheric boundary localized above a tear in the subducting slab (shallower slab angle to the south) used to explain both the locus of Late Cretaceous-Paleocene magmatism and the different ages and mechanisms of slab reconfiguration and removal north and south of the SRP during the Cenozoic. The details of these different histories help outline the complex evolution of this zone and also suggest that this zone of lithospheric weakness may have subsequently focused Miocene SRP-Y hot spot magmatism.

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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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SHRIMP U-Pb dating of recurrent Cryogenian and Late Cambrian-Early Ordovician alkalic magmatism in central Idaho: Implications for Rodinian rift tectonics

Cited by 101 publications

References 96 publications

U–Th–Pb geochronology of meta-carbonatites and meta-alkaline rocks in the southern Canadian Cordillera: A geodynamic perspective

U–Th–Pb geochronology of meta-carbonatites and meta-alkaline rocks in the southern Canadian Cordillera: A geodynamic perspective

Evidence for a long‐lived accommodation/transfer zone beneath the Snake River Plain: A possible influence on Neogene magmatism?

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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