Permian-Jurassic growth and amalgamation of the Wallowa composite terrane, northeastern Oregon

Kays, M. A.; Stimac, J.P.; Goebel, Patti M.

doi:10.1130/2006.2410(23)

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…CA-ID-TIMS p chemical abrasion isotope dilution thermal ionization mass spectrometry; CH p Coon Hollow Formation; DC p Doyle Creek Formation; HW p Hurwal Formation; LA-ICP-MS p laser ablation inductively coupled plasma mass spectrometry; MBLS p Martin Bridge limestone. widely considered to be correlative to similar rocks of the Cache Creek terrane in British Columbia (e.g., Kays et al 2006;Wyld et al 2006).…”

Section: Geologic Settingmentioning

confidence: 99%

Westward Growth of Laurentia by Pre–Late Jurassic Terrane Accretion, Eastern Oregon and Western Idaho, United States

LaMaskin

Dorsey

Vervoort

et al. 2015

The Journal of Geology

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Nd data from the Blue Mountains province, eastern Oregon and western Idaho, clarify terrane correlations and regional evolution of the western Laurentian plate margin during Mesozoic time. We report an Early Jurassic age for a red tuff unit at Pittsburg Landing, Idaho, which is 25 m.yr. older than previous Middle Jurassic estimates. In the Coon Hollow Formation at Pittsburg Landing and at the type location on the Snake River, chemical abrasion thermal ionization mass spectrometry U-Pb zircon ages on interbedded tuff and detrital zircon U-Pb maximum depositional ages indicate that deposition spanned ca. 160-150 Ma, entirely during Late Jurassic time. Detrital zircon U-Pb ages represent local Wallowa arc basement and regional magmatic sources spanning ca. 290-140 Ma. Mudrock Nd isotope compositions of the Coon Hollow Formation record an increase in juvenile magmatism consistent with regional Late Jurassic trends in western North American magmatic systems. These data show that the Coon Hollow Formation is not part of a Middle Jurassic overlap assemblage, as has been historically interpreted. Instead, we propose that the Coon Hollow Formation is part of a belt of suprasubduction-zone extensional back-arc basins that formed in latest Jurassic time due to a well-documented period of trench retreat in the western United States. Our new data require that the underlying Wallowa terrane was accreted to and received detritus from western North America by ca. 160 Ma (early Late Jurassic). This minimum estimate for the age of terrane accretion in western Idaho and eastern Oregon is substantially earlier than previous estimates (∼135-118 Ma). In the Blue Mountains region, westward expansion of Laurentia was accomplished by accretion of arc terranes to the North American craton prior to Late Jurassic time.

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Section: Geologic Settingmentioning

confidence: 99%

Westward Growth of Laurentia by Pre–Late Jurassic Terrane Accretion, Eastern Oregon and Western Idaho, United States

LaMaskin

Dorsey

Vervoort

et al. 2015

The Journal of Geology

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“…Regionally, portions of the Baker terrane have been interpreted to represent a disrupted forearc region (Greenhorn subterrane) and an associated oceanward accretionary prism (Bourne subterrane; Ferns and Brooks, 1995;Schwartz et al, 2010). The Baker terrane is widely considered to be correlative to similar rocks of the Cache Creek terrane in British Columbia and the Eastern Hayfork and Stuart Fork terranes and Central metamorphic belt in the Klamath Mountains (Saleeby, 1983;Miller, 1987;Oldow et al, 1989;Hacker and Goodge, 1990;Burchfiel et al, 1992;Wyld et al, 2006;Kays et al, 2006).…”

Section: Regional Geologymentioning

confidence: 99%

Early Mesozoic paleogeography and tectonic evolution of the western United States: Insights from detrital zircon U-Pb geochronology, Blue Mountains Province, northeastern Oregon

LaMaskin

Vervoort

Dorsey

et al. 2011

Geological Society of America Bulletin

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This study assesses early Mesozoic provenance linkages and paleogeographic-tectonic models for the western United States based on new petrographic and detrital zircon data from Triassic andJurassic sandstones of the "Izee" and Olds Ferry terranes of the Blue Mountains Province, northeastern Oregon. Triassic sediments were likely derived from the Baker terrane offshore accretionary subduction complex and are dominated by Late Archean (ca. 2.7-2.5 Ga), Late Paleo proterozoic (ca. 2.2-1.6 Ga), and Paleozoic (ca. 380-255 Ma) detrital zircon grains. These detrital ages suggest that portions of the Baker terrane have a genetic affinity with other Cordilleran accretionary subduction complexes of the western United States, including those in the Northern Sierra and Eastern Klamath terranes. The abundance of Precambrian grains in detritus derived from an offshore complex highlights the importance of sediment reworking. Jurassic sediments are dominated by Mesozoic detrital ages (ca. 230-160 Ma), contain significant amounts of Paleozoic (ca. 290, 380-350, 480-415 Ma), Neoproterozoic (ca. 675-575 Ma), and Mesoprotero zoic grains (ca. 1.4-1.0 Ga), and have lesser quantities of Late Paleoproterozoic grains (ca. 2.1-1.7 Ga). Detrital zircon ages in Jurassic sediments closely resemble well-documented age distributions in transcontinental sands of Ouachita-Appalachian provenance that were transported across the southwestern United States and modified by input from cratonal, miogeoclinal, and Cordilleran-arc sources during Triassic and Jurassic time. Jurassic sediments likely were derived from the Cordilleran arc and an orogenic highland in Nevada that yielded recycled sand from uplifted Triassic backarc basin deposits. Our data suggest that numerous Jurassic Cordilleran basins formed close to the Cordilleran margin and support a model for moderate post-Jurassic translation (~400 km) of the Blue Mountains Province.

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“…The Blue Mountains region of northeastern Oregon, west-central Idaho, and southeastern Washington State includes oceanic fragments of the Wallowa and Olds Ferry island-arc terranes (Vallier and Batiza, 1978;Kays et al, 2006;Kurz et al, 2012Kurz et al, , 2017, Baker terrane subduction-accretionary complex (Mullen, 1985;Schwartz et al, 2010Schwartz et al, , 2011, and Izee overlap basin assemblage (Mesozoic clastic terrane of Dickinson and Thayer, 1978;Dorsey and LaMaskin, 2007). Concealed largely by Miocene flood basalt (Columbia River Basalt Group; e.g., Hooper and Swanson, 1990), east-to northeast-trending terrane belts are discontinuously exposed over an area exceeding 50,000 km 2 (map coverage of Silberling et al, 1984;cf.…”

Section: ■ Regional Setting Blue Mountains Provincementioning

confidence: 99%

Orogenic link ∼41°N–46°N: Collisional mountain building and basin closure in the Cordillera of western North America

et al. 2019

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Polyphase structural mapping and mineral age dating across the Salmon River suture zone in west-central Idaho (Riggins region; ∼45°30′N, ∼117°W–116°W) support a late Mesozoic history of penetrative deformation, dynamothermal metamorphism, and intermittent magmatism in response to right-oblique oceanic-continental plate convergence (Farallon–North America). High-strain linear-planar tectonite fabrics are recorded along an unbroken ∼48 km west-to-east transect extending from the Snake River (Wallowa intra-oceanic arc terrane; eastern Blue Mountains Province) over the northern Seven Devils Mountains into the lower Salmon River Canyon (ancestral North America; western Laurentia). Given the temporally overlapping nature (ca. 145–90 Ma) of east-west contraction in the Sevier fold-and-thrust belt (northern Utah–southeast Idaho–southwest Montana segment), we propose that long-term terrane accretion and margin-parallel northward translation in the Cordilleran hinterland (∼41°N–46°N latitude; modern coordinates) drove mid- to upper-crustal shortening >250 km eastward into the foreland region (∼115°W–113°W). During accretion and translation, the progressive transfer of arc assemblages from subducting (Farallon) to structurally overriding (North American) plates was accommodated by displacement along a shallow westward-dipping basal décollement system underlying the Cordilleran orogen. In this context, large-magnitude horizontal shortening of passive continental margin strata was balanced by the addition of buoyant oceanic crust—late Paleozoic to Mesozoic Blue Mountains Province—to the leading edge of western Laurentia. Consistent with orogenic float modeling (mass conservation, balance, and displacement compatibility), diffuse dextral-transpressional deformation across the accretionary boundary (Salmon River suture: Cordilleran hinterland) was kinematically linked to eastward-propagating structures on the continental interior (Sevier thrust belt; Cordilleran foreland). As an alternative to noncollisional convergent margin orogenesis, we propose a collision-related tectonic origin and contractional evolution for central portions of the Sevier belt. Our timing of terrane accretion supports correlation of the Wallowa terrane with Wrangellia (composite arc/plateau assemblage) and implies diachronous south-to-north suturing and basin closure between Idaho and Alaska.

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Permian-Jurassic growth and amalgamation of the Wallowa composite terrane, northeastern Oregon

Cited by 9 publications

References 27 publications

Westward Growth of Laurentia by Pre–Late Jurassic Terrane Accretion, Eastern Oregon and Western Idaho, United States

Westward Growth of Laurentia by Pre–Late Jurassic Terrane Accretion, Eastern Oregon and Western Idaho, United States

Early Mesozoic paleogeography and tectonic evolution of the western United States: Insights from detrital zircon U-Pb geochronology, Blue Mountains Province, northeastern Oregon

Orogenic link ∼41°N–46°N: Collisional mountain building and basin closure in the Cordillera of western North America

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