Migrating magmatism in the northern US Cordillera: in situ U–Pb geochronology of the Idaho batholith

Gaschnig, Richard M.; Vervoort, Jeffrey D.; Lewis, Reed S.; McClelland, William C.

doi:10.1007/s00410-009-0459-5

Cited by 141 publications

(209 citation statements)

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“…10; Lewis et al, 1987). Recent U-Pb geochronology of the Idaho Batholith revealed an early metaluminous suite of plutons that are 98-85 Ma in age (Gaschnig et al, 2010), with ε Hf values that range from -6 to -12 (Gaschnig et al, 2011). Many of these Cretaceous zircon crystals in the Idaho Batholith contain Precambrian cores (Gaschnig et al, 2010).…”

Section: -Ks-mentioning

confidence: 99%

“…8; Linn et al, 1991Linn et al, , 1992. The 98-85 Ma early metaluminous suite of plutons in the Idaho Batholith (Gaschnig et al, 2010) also matches these Late Cretaceous detrital zircon ages, but we fi nd little evidence of inherited Precambrian cores in the detrital zircon grains, and ε Hf values from the 85-100 Ma detrital zircons in the Rocky Gulch Sandstone vary from +13.1 to -9.6, i.e., more positive than the -6 to -12 ε Hf values reported for similar ages in the Idaho Batholith (Gaschnig et al, 2011 The Rancheria Gulch Sandstone Beds sample contains abundant Precambrian detrital zircon characterized by two broad peaks at 1300-1500 Ma and 1600-1800 Ma (Fig. 6).…”

Section: Hornbrook Formation Provenancementioning

confidence: 99%

“…90 Ma. With shallowing of the subducting Farallon slab to near horizontal (e.g., Saleeby, 2003;Dickinson, 2004;Liu et al, 2008), magmatism in the Sierran arc ceased by 82 Ma (Stern et al, 1981;Chen and Moore, 1982), and a peraluminous magmatic fl ux event occurred in the Idaho Batholith from 80 to 67 Ma (Gaschnig et al, 2010). Inverse mantle convection modeling predicts that Farallon slab fl attening began at ca.…”

Section: Tectonic Implications Of Hornbrook Formation Provenancementioning

confidence: 99%

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Understanding a critical basinal link in Cretaceous Cordilleran paleogeography: Detailed provenance of the Hornbrook Formation, Oregon and California

Surpless¹,

Beverly²

2013

Geological Society of America Bulletin

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Section: -Ks-mentioning

confidence: 99%

Section: Hornbrook Formation Provenancementioning

confidence: 99%

Section: Tectonic Implications Of Hornbrook Formation Provenancementioning

confidence: 99%

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Understanding a critical basinal link in Cretaceous Cordilleran paleogeography: Detailed provenance of the Hornbrook Formation, Oregon and California

Surpless¹,

Beverly²

2013

Geological Society of America Bulletin

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“…Unradiogenic Hf-isotope compositions are observed in ca. 100-70 Ma Idaho Batholith zircons (Toth and Stacey, 1992;Lund et al, 2003;Gaschnig et al, 2009Gaschnig et al, , 2011Gaschnig et al, , 2013 (Fig. 7A and Table 3); however, WMB zircons also include more radiogenic grains and require an additional source.…”

Section: Upper Cretaceous Unitsmentioning

confidence: 99%

“…Voluminous magmatism is represented by the Peninsular Ranges batholith (e.g., Silver and Chappell, 1988;Busby, 2004;Morton et al, 2014), Sierra Nevada batholith (e.g., Bateman, 1992;Coleman and Glazner, 1997;Cecil et al, 2012), Idaho batholith (e.g., Hyndman, 1983;Gaschnig et al, 2009), and plutons that form the Coast Plutonic Complex-North Cascades range (e.g., Barker and Arth, 1984;Gehrels et al, 2009;Miller et al, 2009) (Fig. 1).…”

Section: Geologic Settingmentioning

confidence: 99%

Evolution of the Jura-Cretaceous North American Cordilleran margin: Insights from detrital-zircon U-Pb and Hf isotopes of sedimentary units of the North Cascades Range, Washington

et al. 2017

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The U-Pb age and Hf-isotope composition of detrital zircons from Jurassic to Upper Cretaceous sedimentary rocks adjacent to the southern North Cascades-Coast Plutonic Complex continental magmatic arc document shifting provenance, the tectonic evolution of the arc system, and translation along the continental margin. Systematic changes in the detrital-zircon data provide insight that the western margin of North America evolved from: marginal basins adjacent to continent-fringing oceanic arcs (ca. 160-140 Ma); forearc basins adjacent to mid-Cretaceous (ca. 120-90 Ma) Andean-type continental arcs; and addition of a cratonic source to forearc and accretionary wedge units to Cordilleran arc systems in the mid-Late Cretaceous (ca. 85 Ma). Jurassic Methow terrane, Nooksack Formation, and western mélange belt units dominantly contain detrital zircons derived from accreted oceanic terranes, whereas Lower Cretaceous strata from the same units have age peaks that correspond to known pulses of magmatism in Cordilleran continental magmatic arc systems. The age peaks and Hf-isotope signature of the Jurassic and Lower Cretaceous strata are comparable to multiple sources exposed along the margin. In contrast, the Upper Cretaceous western mélange belt has distinct Precambrian zircon populations and unradiogenic Late Cretaceous zircons that are more similar to southwestern than northwestern Laurentian sources. Statistical comparisons confirm provenance similarities between rocks of the North Cascades and those 700-2000 km to the south and, thus, support marginparallel translation from as far as the latitude of southern California.

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Chemical and Pb isotope composition of phenocrysts from bentonites constrains the chronostratigraphy around the Cretaceous‐Paleogene boundary in the Hell Creek region, Montana

Ickert

Mulcahy

Sprain

et al. 2015

Geochem Geophys Geosyst

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An excellent record of environmental and paleobiological change around the CretaceousPaleogene boundary is preserved in the Hell Creek and Fort Union Formations in the western Williston Basin of northeastern Montana. These records are present in fluvial deposits whose lateral discontinuity hampers long-distance correlation. Geochronology has been focused on bentonite beds that are often present in lignites. To better identify unique bentonites for correlation across the region, the chemical and Pb isotopic composition of feldspar and titanite has been measured on 46 samples. Many of these samples have been dated by 40 Ar/ 39 Ar. The combination of chemical and isotopic compositions of phenocrysts has enabled the identification of several unique bentonite beds. In particular, three horizons located at and above the Cretaceous-Paleogene boundary can now be traced-based on their unique compositions-across the region, clarifying previously ambiguous stratigraphic relationships. Other bentonites show unusual features, such as Pb isotope variations consistent with magma mixing or assimilation, that will make them easy to recognize in future studies. This technique is limited in some cases by more than one bentonite having compositions that cannot be distinguished, or bentonites with abundant xenocrysts. The Pb isotopes are consistent with a derivation from the Bitterroot Batholith, whose age range overlaps that of the tephra. These data provide an improved stratigraphic framework for the Hell Creek region and provide a basis for more focused tephrostratigraphic work, and more generally demonstrate that the combination of mineral chemistry and Pb isotope compositions is an effective technique for tephra correlation.

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Migrating magmatism in the northern US Cordillera: in situ U–Pb geochronology of the Idaho batholith

Cited by 141 publications

References 80 publications

Understanding a critical basinal link in Cretaceous Cordilleran paleogeography: Detailed provenance of the Hornbrook Formation, Oregon and California

Understanding a critical basinal link in Cretaceous Cordilleran paleogeography: Detailed provenance of the Hornbrook Formation, Oregon and California

Evolution of the Jura-Cretaceous North American Cordilleran margin: Insights from detrital-zircon U-Pb and Hf isotopes of sedimentary units of the North Cascades Range, Washington

Chemical and Pb isotope composition of phenocrysts from bentonites constrains the chronostratigraphy around the Cretaceous‐Paleogene boundary in the Hell Creek region, Montana

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