The Late Cretaceous San Juan thrust system, San Juan Islands, Washington

Brandon, M. T.; Cowan, Darrel S.; Vance, Joseph A.

doi:10.1130/spe221-p1

Cited by 61 publications

(147 citation statements)

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“…100 Ma. This more moderate ~700 km displacement is consistent with lithologic and detrital-zircon data that suggest various components of the NWCS nappes formed at the latitude of the Klamath Mountains (Brown, 1987;Brandon et al, 1988;Brown and Gehrels, 2007;MacDonald et al, 2008). These hypotheses of paleogeography and magnitude of terrane translation can be further evaluated, and potentially refined, with U-Pb and Hf-isotope investigations of detrital zircon from samples from the Methow terrane, NWCS, and WMB.…”

Section: Paleogeographic Reconstructionssupporting

confidence: 76%

“…The Methow terrane (Barksdale, 1975), the northwest Cascades thrust system (Misch, 1966;Brandon et al, 1988;Brown and Gehrels, 2007), the western mélange belt (Frizzell et al, 1987;Tabor et al, 1993), and the Nanaimo Group mainly contain volcanic and plutonic sedimentary detritus (Jett and Heller, 1988;Mustard, 1994;DeGraaff-Surpless et al, 2003;Brown and Gehrels, 2007;Brown, 2012;Surpless et al, 2014). The NWCS and WMB were amalgamated with the Insular superterrane by the Late Cretaceous (Misch, 1966;Brown, 1987;Brandon et al, 1988), whereas the Methow terrane lies between the plutonic rocks of the Coast Plutonic Complex-North Cascades and Intermontane the east (Fig.…”

Section: Sedimentary Units Adjacent To the North Cascadesmentioning

confidence: 99%

“…The NWCS and WMB were amalgamated with the Insular superterrane by the Late Cretaceous (Misch, 1966;Brown, 1987;Brandon et al, 1988), whereas the Methow terrane lies between the plutonic rocks of the Coast Plutonic Complex-North Cascades and Intermontane the east (Fig. 2).…”

Section: Sedimentary Units Adjacent To the North Cascadesmentioning

confidence: 99%

“…2). The nappes of the NWCS consist of Paleozoic to Mesozoic oceanic and island-arc assemblages, with a large component of Jurassic-Early Cretaceous immature, oceanic clastic strata that have experienced multiple episodes of accretion and subduction-zone metamorphism (Brandon et al, 1988;Brown and Gehrels, 2007).…”

Section: Northwest Cascades Thrust Systemmentioning

confidence: 99%

“…114-59 Ma (Tabor, 1994;Brown and Gehrels, 2007). However, the majority of thrusting is generally interpreted to have occurred by the beginning of the Late Cretaceous (Misch, 1966;Brandon et al, 1988;McGroder, 1991).…”

Section: Northwest Cascades Thrust Systemmentioning

confidence: 99%

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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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Section: Paleogeographic Reconstructionssupporting

confidence: 76%

Section: Sedimentary Units Adjacent To the North Cascadesmentioning

confidence: 99%

Section: Sedimentary Units Adjacent To the North Cascadesmentioning

confidence: 99%

Section: Northwest Cascades Thrust Systemmentioning

confidence: 99%

Section: Northwest Cascades Thrust Systemmentioning

confidence: 99%

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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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Petrographic and geochemical source-modeling of volcanic lithics from archaeological contexts: A case study from British Camp, San Juan Island, Washington

Bakewell

1996

Geoarchaeology

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Transfer of Metasupracrustal Rocks to Midcrustal Depths in the North Cascades Continental Magmatic Arc, Skagit Gneiss Complex, Washington

et al. 2017

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The metasupracrustal units within the north central Chelan block of the North Cascades Range, Washington, are investigated to determine mechanisms and timescales of supracrustal rock incorporation into the deep crust of continental magmatic arcs. Zircon U‐Pb and Hf‐isotope analyses were used to characterize the protoliths of metasedimentary and metaigneous rocks from the Skagit Gneiss Complex, metasupracrustal rocks from the Cascade River Schist, and metavolcanic rocks from the Napeequa Schist. Skagit Gneiss Complex metasedimentary rocks have (1) a wide range of zircon U‐Pb dates from Proterozoic to latest Cretaceous and (2) a more limited range of dates, from Late Triassic to latest Cretaceous, and a lack of Proterozoic dates. Two samples from the Cascade River Schist are characterized by Late Cretaceous protoliths. Amphibolites from the Napeequa Schist have Late Triassic protoliths. Similarities between the Skagit Gneiss metasediments and accretionary wedge and forearc sediments in northwestern Washington and Southern California indicate that the protolith for these units was likely deposited in a forearc basin and/or accretionary wedge in the Early to Late Cretaceous (circa 134–79 Ma). Sediment was likely underthrust into the active arc by circa 74–65 Ma, as soon as 7 Ma after deposition, and intruded by voluminous magmas. The incorporation of metasupracrustal units aligns with the timing of major arc magmatism in the North Cascades (circa 79–60 Ma) and may indicate a link between the burial of sediments and pluton emplacement.

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The Late Cretaceous San Juan thrust system, San Juan Islands, Washington

Cited by 61 publications

References 0 publications

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

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

Petrographic and geochemical source-modeling of volcanic lithics from archaeological contexts: A case study from British Camp, San Juan Island, Washington

Transfer of Metasupracrustal Rocks to Midcrustal Depths in the North Cascades Continental Magmatic Arc, Skagit Gneiss Complex, Washington

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