Isotopic Evolution of the Idaho Batholith and Challis Intrusive Province, Northern US Cordillera

Gaschnig, Richard M.; Vervoort, Jeffrey D.; Lewis, Reed S.; Tikoff, Basil

doi:10.1093/petrology/egr050

Cited by 138 publications

(155 citation statements)

References 97 publications

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“…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 Provenancesupporting

confidence: 53%

“…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%

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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: Hornbrook Formation Provenancesupporting

confidence: 53%

Section: -Ks-mentioning

confidence: 99%

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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“…However, magmatism continued in the Idaho batholith. The IB has an overall age range from 98 to 53 Ma and was emplaced in a contractional setting during SevierLaramide orogenic thrusting (Gaschnig et al 2010(Gaschnig et al , 2011(Gaschnig et al , 2013. Moderate volumes of 98-85 Ma granitic rocks are present and may have been more extensive before later assimilation into younger plutons.…”

Section: Franciscan Geology Of Northwestern Californiamentioning

confidence: 99%

Detrital zircon U–Pb reconnaissance of the Franciscan subduction complex in northwestern California

Dumitru

Ernst

Hourigan

et al. 2015

International Geology Review

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In northwestern California, the Franciscan subduction complex has been subdivided into seven major tectonostratigraphic units. We report U-Pb ages of ≈2400 detrital zircon grains from 26 sandstone samples from 5 of these units. Here, we tabulate each unit's interpreted predominant sediment source areas and depositional age range, ordered from the oldest to the youngest unit. (1) Yolla Bolly terrane: nearby Sierra Nevada batholith (SNB); ca. 118 to 98 Ma. Rare fossils had indicated that this unit was mostly 151-137 Ma, but it is mostly much younger. (2) Central Belt: SNB; ca. 103 to 53 Ma (but poorly constrained), again mostly younger than previously thought. (3) Yager terrane: distant Idaho batholith (IB); ca. 52 to 50 Ma. Much of the Yager's detritus was shed during major core complex extension and erosion in Idaho that started 53 Ma. An Eocene Princeton River-Princeton submarine canyon system transported this detritus to the Great Valley forearc basin and thence to the Franciscan trench. (4) Coastal terrane: mostly IB, ±SNB, ±nearby Cascade arc, ±Nevada Cenozoic ignimbrite belt; 52 to <32 Ma. (5) King Range terrane: dominated by IB and SNB zircons; parts 16-14 Ma based on microfossils. Overall, some Franciscan units are younger than previously thought, making them more compatible with models for the growth of subduction complexes by progressive accretion. From ca. 118 to 70 Ma, Franciscan sediments were sourced mainly from the nearby Sierra Nevada region and were isolated from southwestern US and Mexican sources. From 53 to 49 Ma, the Franciscan was sourced from both Idaho and the Sierra Nevada. By 37-32 Ma, input from Idaho had ceased. The influx from Idaho probably reflects major tectonism in Idaho, Oregon, and Washington, plus development of a through-going Princeton River to California, rather than radical changes in the subduction system at the Franciscan trench itself.

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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%

“…The U-Pb age spectra of detrital zircons from western North American Cor dilleran sedimentary rocks have been used to help understand episodic high-flux magmatism (Paterson and Ducea, 2015), the timing at which sediment sources were uplifted and when basins subsided (e.g., DeGraaff-Surpless et al, 2003;Laskowski et al, 2013;Surpless et al, 2014), paleogeography, and terrane mobility (e.g., Gehrels et al, 1995;Housen and Beck, 1999;Barbeau et al, 2005). Hafnium-isotope analyses of detrital zircons are used as an additional fingerprint of sedimentary provenance (e.g., Gehrels and Pecha, 2014;Surpless et al, 2014;Holland et al, 2015) by comparing to zircon Hf-isotope compositions of potential source rocks (e.g., Goodge and Vervoort, 2006;Gaschnig et al, 2011;Lackey et al, 2012;Shaw et al, 2014).…”

Section: Introductionmentioning

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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Isotopic Evolution of the Idaho Batholith and Challis Intrusive Province, Northern US Cordillera

Cited by 138 publications

References 97 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

Detrital zircon U–Pb reconnaissance of the Franciscan subduction complex in northwestern 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

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