The generation of high Sr/Y plutons following Late Jurassic arc–arc collision, Blue Mountains province, NE Oregon

Schwartz, Joshua; Johnson, Kenneth S.; Miranda, Elena A.; Wooden, Joseph L.

doi:10.1016/j.lithos.2011.05.005

Cited by 37 publications

(69 citation statements)

References 113 publications

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“…Tectonic thickening can be achieved by shallow subduction of a thick oceanic crust or by arc-arc and arc-continental collision (Smithies et al, 2003;Lee et al, 2007;Schwartz et al, 2011). The Huoqiu volcanic rocks (now amphibolites) show geochemical characteristics of arc tholeiite affinity and their geochemical features are consistent with formation in a continental arc setting (Liu and Yang, 2013).…”

Section: Tectonic Environmentmentioning

confidence: 99%

Neoarchean to Paleoproterozoic continental growth in the southeastern margin of the North China Craton: Geochemical, zircon U–Pb and Hf isotope evidence from the Huoqiu complex

et al. 2015

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Section: Tectonic Environmentmentioning

confidence: 99%

Neoarchean to Paleoproterozoic continental growth in the southeastern margin of the North China Craton: Geochemical, zircon U–Pb and Hf isotope evidence from the Huoqiu complex

et al. 2015

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“…Following arc amalgamation, the Izee basin was deposited on these terranes during the Early to Middle Jurassic (~195 Ma). East dipping subduction beneath North America began during the Late Jurassic [ Dorsey and LaMaskin , ; Schwartz et al ., ], at ~160 Ma, sedimentation in the Izee basin ceased, and sediments with North American provenance began to accumulate on the Wallowa terrane, indicating the docking of the Blue Mountains to North America [ Dorsey and LaMaskin , ; LaMaskin et al ., ]. Tectonic reconstruction models of Wyld and Wright [] suggest that accretion may have occurred approximately 400 km south of the current location of the Blue Mountains terranes, although Housen and Dorsey [] indicate an ~1700 km northward translation along a NS oriented dextral strike‐slip fault to attain their current position.…”

Section: Introductionmentioning

confidence: 99%

Crustal structure beneath the Blue Mountains terranes and cratonic North America, eastern Oregon, and Idaho, from teleseismic receiver functions

et al. 2016

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We present new images of lithospheric structure obtained from P‐to‐S conversions defined by receiver functions at the 85 broadband seismic stations of the EarthScope IDaho‐ORegon experiment. We resolve the crustal thickness beneath the Blue Mountains province and the former western margin of cratonic North America, the geometry of the western Idaho shear zone (WISZ), and the boundary between the Grouse Creek and Farmington provinces. We calculated P‐to‐S receiver functions using the iterative time domain deconvolution method, and we used the H‐k grid search method and common conversion point stacking to image the lithospheric structure. Moho depths beneath the Blue Mountains terranes range from 24 to 34 km, whereas the crust is 32–40 km thick beneath the Idaho batholith and the regions of extended crust of east‐central Idaho. The Blue Mountains group Olds Ferry terrane is characterized by the thinnest crust in the study area, ~24 km thick. There is a clear break in the continuity of the Moho across the WISZ, with depths increasing from 28 km west of the shear zone to 36 km just east of its surface expression. The presence of a strong midcrustal converting interface at ~18 km depth beneath the Idaho batholith extending ~20 km east of the WISZ indicates tectonic wedging in this region. A north striking ~7 km offset in Moho depth, thinning to the east, is present beneath the Lost River Range and Pahsimeroi Valley; we identify this sharp offset as the boundary that juxtaposes the Archean Grouse Creek block with the Paleoproterozoic Farmington zone.

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“…εHf i depleted mantle value is fromNowell et al (1998). The range in εHf i values of zircons from the Blue Mountains Province is fromSchwartz et al (2011).…”

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The earliest low and high Î´18O caldera-forming eruptions of the Yellowstone plume: implications for the 30â€“40 Ma Oregon calderas and speculations on plume-triggered delaminations

et al. 2014

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We present new isotopic and trace element data for four eruptive centers in Oregon: Wildcat Mountain (40 Ma), Crooked River (32-28 Ma), Tower Mountain (32 Ma), and Mohawk River (32 Ma). The first three calderas are located too far east to be sourced through renewed subduction of the Farallon slab following accretion of the Yellowstone-produced Siletzia terrane at ∼50 Ma. Basalts of the three eastern eruptive centers yield high Nb/Yb and Th/Yb ratios, indicating an enriched sublithospheric mantle source, while Mohawk River yields trace element and isotopic ( 18 δ O and εHf) values that correlate with its location above a subduction zone. The voluminous rhyolitic tuffs and lavas of Crooked River (41 × 27 km) have 18 18 δ O zircon values that include seven low δ O zircon units (1.8-4.5 ), one high 18 δ O zircon unit (7.4-8.8 y ), and two units with heterogeneous zircons (2.0-9.0 ), similar to ounger Yellowstone-Snake River Plain rhyolites. In order to produce these low 18 δ O values, a large heat source, widespread hydrothermal circulation, and repeated remelting are all required. In contrast, Wildcat Mountain and Tower Mountain rocks yield high 18 δ O zircon values (6.4-7.9 ) and normal to low εHf i values (5.2-12.6), indicating crustal melting of high- 18 δ O supracrustal rocks. We propose that these calderas were produced by the first appearance of the Yellowstone plume east of the Cascadia subduction zone, which is supported by plate reconstructions that put the Yellowstone plume under Crooked River at 32-28 Ma. Given the eastern location of these calderas along the suture of the accreted Siletzia terrane and North America, we suggest that the Yellowstone hotspot is directly responsible for magmatism at Crooked River, and for plume-assisted delamination of portions of the edge of the Blue Mountains that produced the Tower Mountain magmas, while the older Wildcat Mountain magmas are related to suture zone instabilities that were created following accretion of the Siletzia terrane. Citation: Seligman AN, Bindeman IN, McClaughry J, Stern RA and Fisher C (2014) The earliest low and high δ 18 O caldera-forming eruptions of the Yellowstone plume: implications for the 30-40 Ma Oregon calderas and speculations on plume-triggered delaminations. Front. Earth Sci. 2:34.

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The generation of high Sr/Y plutons following Late Jurassic arc–arc collision, Blue Mountains province, NE Oregon

Cited by 37 publications

References 113 publications

Neoarchean to Paleoproterozoic continental growth in the southeastern margin of the North China Craton: Geochemical, zircon U–Pb and Hf isotope evidence from the Huoqiu complex

Neoarchean to Paleoproterozoic continental growth in the southeastern margin of the North China Craton: Geochemical, zircon U–Pb and Hf isotope evidence from the Huoqiu complex

Crustal structure beneath the Blue Mountains terranes and cratonic North America, eastern Oregon, and Idaho, from teleseismic receiver functions

The earliest low and high Î´18O caldera-forming eruptions of the Yellowstone plume: implications for the 30â€“40 Ma Oregon calderas and speculations on plume-triggered delaminations

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