500–490 Ma detrital zircons in Upper Cambrian Worm Creek and correlative sandstones, Idaho, Montana, and Wyoming: Magmatism and tectonism within the passive margin

Link, Paul K.; Todt, Mary Katherine; Pearson, David; Thomas, Robert

doi:10.1130/l671.1

Cited by 29 publications

(74 citation statements)

References 59 publications

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“…Tectonics also supports models (e.g., Link, Todt, et al, 2017;Lund, 2008;McMechan, 2012) that implicate the prerifting basement configuration as a major control on along-strike heterogeneities in structural and stratigraphic architecture of the Laurentian rift margin.…”

Section: /2020tc006145supporting

confidence: 61%

“…Lithospheric-scale lineaments (including the northeast trending Snake River transfer zone of Lund, 2008) border most of the significant Cambrian-Ordovician basins of the northern Cordillera, and trend approximately perpendicular to the inferred rift margin (Figures 1 and 2; Cecile et al, 1997;Hayward, 2015;Link, Todt, et al, 2017;McMechan, 2012;Pyle & Barnes, 2003;Roots & Thompson, 1992;Turner et al, 1989). The spatial association of these transfer-transform faults with Proterozoic, Paleozoic, and Cenozoic igneous rocks implies that these structures represent long-lived, leaky zones that were periodically reactivated (Audet et al, 2016;Campbell et al, 2019;Lund, 2008;Millonig et al, 2012).…”

Section: /2020tc006145mentioning

confidence: 98%

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Neoproterozoic Windermere Supergroup Near Bayhorse, Idaho: Late‐Stage Rodinian Rifting Was Deflected West Around the Belt Basin

et al. 2020

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Conflicting models of Rodinian rifting have been proposed to explain the recognized variation in the Neoproterozoic and early Cambrian tectonostratigraphic architecture of the western Laurentian margin. However, discrimination among rift models is hampered by limited exposure and metamorphism of the rocks. Southeastern Idaho preserves more than 6 km of Neoproterozoic and Cambrian strata. In contrast, along the inferred continuation of the margin in east central Idaho, correlative rocks are missing across the Lemhi arch. Our field mapping and U‐Pb dating studies, located approximately 50 km west of the Lemhi arch unconformity, focused on a succession of regionally extensive rocks that were previously assigned an Ordovician age. We show that ~1.5 km of strata here overlies a ~667 Ma reworked felsic tuff and was intruded by a 601 ± 27 Ma gabbro sill; we thus redesignate these rocks as Cryogenian and Ediacaran in age. These rocks are overlain by a ~1 km thick Ediacaran to middle Cambrian quartzite. Middle Ordovician quartzites overlie these middle Cambrian strata, indicating that though Neoproterozoic and lower Cambrian rocks are present west of the Lemhi arch, upper Cambrian and Lower Ordovician rocks are thin or absent. Comparison of this redesignated section to the closest correlative sections suggests an initial stage of symmetric rifting followed by later asymmetric rifting. We suggest that prerifting ~1,370 Ma magmatism within the Belt basin produced lithospheric rigidity that influenced the final stage of rifting and produced heterogeneity in the geometries of structural domains similar to those documented in other well‐defined, modern rift margins.

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Section: /2020tc006145supporting

confidence: 61%

Section: /2020tc006145mentioning

confidence: 98%

Neoproterozoic Windermere Supergroup Near Bayhorse, Idaho: Late‐Stage Rodinian Rifting Was Deflected West Around the Belt Basin

et al. 2020

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“…Volcanic rocks in the southern Kootenay terrane and Roberts Mountain allochthon were probably deposited in an outer continental margin setting that underwent extensional or transtensional faulting (e.g., Turner et al, 1989). Late Cambrian detrital zircons with chondritic to subchondritic Hf-isotope compositions occur in the upper Cambrian St. Charles Formation of Idaho and likely indicate the uplift of the Lemhi arch and erosion of the Big Creek-Beaverhead belt during reactivation of Snake River transfer fault (Link et al, 2017).…”

Section: ■ Lower Paleozoic Stratigraphy Of the Northern Cordillera Ovmentioning

confidence: 99%

Early Paleozoic post-breakup magmatism along the Cordilleran margin of western North America: New zircon U-Pb age and whole-rock Nd- and Hf-isotope and lithogeochemical results from the Kechika group, Yukon, Canada

et al. 2019

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Post-breakup magmatic rocks are recognized features of modern and ancient passive margin successions around the globe, but their timing and significance to non-plume-related rift evolution is generally uncertain. Along the Cordilleran margin of western North America, several competing rift models have been proposed to explain the origins of post-breakup igneous rocks that crop out from Yukon to Nevada. New zircon U-Pb age and whole-rock geochemical studies were conducted on the lower Paleozoic Kechika group, south-central Yukon, to test these rift models and constrain the timing, mantle source, and tectonic setting of post-breakup magmatism in the Canadian Cordillera. The Kechika group contains vent-proximal facies and sediment-sill complexes within the Cassiar platform, a linear paleogeographic high that developed outboard of continental shelf and trough basins. Chemical abrasion (CA-TIMS) U-Pb dates indicate that Kechika group mafic rocks were generated during the late Cambrian (488–483 Ma) and Early Ordovician (473 Ma). Whole-rock trace-element and Nd- and Hf-isotope results are consistent with the low-degree partial melting of an enriched lithospheric mantle source during margin-scale extension. Equivalent continental shelf and trough rocks along western North America are spatially associated with transfer-transform zones and faults that were episodically reactivated during Cordilleran rift evolution. Post-breakup rocks emplaced along the magma-poor North Atlantic margins, including those near the Orphan Knoll and Galicia Bank continental ribbons, are proposed modern analogues for the Kechika group. This scenario calls for the release of in-plane tensile stresses and off-axis, post-breakup magmatism along the nascent plate boundary prior to the onset of seafloor spreading.

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“…The Belt Supergroup ( n = 3,854), exposed today in western Montana, is characterized by a dominant 1800–1700 Ma age peak with minor populations at ~1500 and ~2500–2800 Ma (Ross & Villeneuve, ; Lewis et al, ; Stewart et al, ; Link et al, , and Mueller et al, ; Figure ). The Neoproterozoic to Cambrian Brigham Group and coeval strata ( n = 1,844) in Utah and southeastern Idaho is characterized by a prominent 1900–1600 Ma age peak, two smaller populations at ~1100 and ~1450 Ma, and minor population at ~2400‐2800 Ma (Yonkee et al, ; Link et al, ; Figure ).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…Of the remaining potential sources, approximately 27% and 29% of zircons fall into the 1800–1600 Ma category from the Mogollon Highlands data set (Laskowski et al, ) and the Neoproterozoic to Cambrian Brigham Group and coeval strata in Utah and southeastern Idaho (Link et al, ; Yonkee et al, ), respectively. The Mogollon Highlands source shows an additional prominent age population at ~100–250 Ma (Figure ), and the Brigham Group and coeval strata show a prominent Yavapai‐Mazatzal population but with a very distinctive peak at ~1785 Ma (Figure ).…”

Section: Interpretationsmentioning

confidence: 99%

Detrital Zircon Geochronology of Upper Cretaceous to Paleocene Sandstones From South‐Central Wyoming: Evidence for Middle Campanian Laramide Deformation

Lynds

Xie

2019

Tectonics

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500–490 Ma detrital zircons in Upper Cambrian Worm Creek and correlative sandstones, Idaho, Montana, and Wyoming: Magmatism and tectonism within the passive margin

Cited by 29 publications

References 59 publications

Neoproterozoic Windermere Supergroup Near Bayhorse, Idaho: Late‐Stage Rodinian Rifting Was Deflected West Around the Belt Basin

Neoproterozoic Windermere Supergroup Near Bayhorse, Idaho: Late‐Stage Rodinian Rifting Was Deflected West Around the Belt Basin

Early Paleozoic post-breakup magmatism along the Cordilleran margin of western North America: New zircon U-Pb age and whole-rock Nd- and Hf-isotope and lithogeochemical results from the Kechika group, Yukon, Canada

Detrital Zircon Geochronology of Upper Cretaceous to Paleocene Sandstones From South‐Central Wyoming: Evidence for Middle Campanian Laramide Deformation

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