Geochemistry of Triassic flood basalts from the Yukon (Canada) segment of the accreted Wrangellia oceanic plateau

Greene, Andrew R.; Scoates, James S.; Weis, Dominique; Israel, Steve

doi:10.1016/j.lithos.2008.11.010

Cited by 43 publications

(52 citation statements)

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“…Paleomagnetic studies of Wrangellia fl ood basalts indicate eruption in equatorial latitudes (Irving and Yole, 1972;Hillhouse, 1977;Hillhouse and Gromme, 1984), and Late Triassic bivalves indicate an eastern Panthalassan position in the Late Triassic (Newton, 1983). A mantle plume origin for the Wrangellia fl ood basalts was proposed by Richards et al (1991) and is supported by ongoing geochemical and petrological studies (Greene et al, , 2009a(Greene et al, , 2009b. Late Triassic-Early Jurassic arc magmatism is preserved as intrusions within and volcanic sequences overlying Wrangellia fl ood basalts throughout areas on Vancouver Island.…”

Section: Geologic History Of Wrangelliamentioning

confidence: 76%

“…The volcanic stratigraphy on Vancouver Island consists of a tripartite succession of submarine fl ows (50%-60% of total thickness), volcaniclastics, and subaerial fl ows, whereas volcanic stratigraphy in Alaska and Yukon is predominantly subaerial fl ows (>90%; Table 5; Greene et al, 2008Greene et al, , 2009aGreene et al, , 2009b. In areas of central Vancouver Island, the stratigraphically lowest pillow basalts were emplaced on unconsolidated fi ne-grained sediments, and mafi c sills intrude marine strata with Daonella beds.…”

Section: Comparison Of Northern and Southern Wrangelliamentioning

confidence: 99%

“…Laterally discontinuous zones of conglomerate along the base of the Nikolai Formation in Yukon have been interpreted as syntectonic deposits and fl ows related to the formation of grabens (Israel et al, 2006). The fl ood basalts in Northern Wrangellia are low-Ti basalts (<400 m) overlain by high-Ti basalts, whereas almost all of the basalt stratigraphy in Southern Wrangellia is high-Ti basalt and includes an area 30 km in diameter with abundant picritic pillow basalts (Greene et al, , 2009a(Greene et al, , 2009b.…”

Section: Comparison Of Northern and Southern Wrangelliamentioning

confidence: 99%

“…This material is presented as descriptions of Wrangellia stratigraphy, compiled geologic maps, photographic databases, an interactive Google Earth fi le, and a review and compilation of previous research on Wrangellia. The maps, photographs, and archiving of information offer tools to visualize and fully explore the large body of information about Wrangellia, bringing together past and present research to provide an overview of the architecture of the Wrangellia oceanic plateau (Greene et al, , 2009a(Greene et al, , 2009b. This contribution highlights the prominent geologic features of the Wrangellia oceanic plateau, and compares them to other oceanic plateaus, to provide information that can be used to test and refi ne models on the genesis of oceanic plateaus.…”

Section: Introductionmentioning

confidence: 99%

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The architecture of oceanic plateaus revealed by the volcanic stratigraphy of the accreted Wrangellia oceanic plateau

Greene¹

2010

Geosphere

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Section: Geologic History Of Wrangelliamentioning

confidence: 76%

Section: Comparison Of Northern and Southern Wrangelliamentioning

confidence: 99%

Section: Comparison Of Northern and Southern Wrangelliamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The architecture of oceanic plateaus revealed by the volcanic stratigraphy of the accreted Wrangellia oceanic plateau

Greene¹

2010

Geosphere

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“…Nikolai Greenstone data are from Greene et al (2008Greene et al ( , 2009. Error bars are one standard deviation.…”

Section: Final Thoughtmentioning

confidence: 99%

Initiation of the Wrangell Arc: A Record of Tectonic Changes in an Arc-Transform Junction Revealed by New Geochemistry and Geochronology of the ~29–18 Ma Sonya Creek Volcanic Field, Alaska

Berkelhammer¹

2017

Geological Society of America Abstracts With Programs

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The Sonya Creek volcanic field (SCVF) contains the oldest in situ magmatic products in the ~29 Ma-modern Wrangell arc (WA) in south-central Alaska. The WA is located within a transition zone between Aleutian subduction to the west and dextral strike-slip tectonics along the Queen Charlotte-Fairweather and Denali-Duke River fault systems to the east. WA magmatism is due to the shallow subduction (11-16°) WA, and no alkaline lavas that characterize the ~18-10 Ma Yukon WA are present. Sr-Nd-Pb-Hf radiogenic isotope data suggest the SCVF data were generated by contamination of a depleted mantle wedge by ~0.2-4% subducted terrigenous sediment, agreeing with geologic evidence from many places along the southern Alaskan margin. Our combined dataset reveals geochemical and spatial transitions through the lifetime of the SCVF, which record changing tectonic processes during the early evolution of the WA. The earliest SCVF phases suggest the initiation of Yakutat microplate subduction. Early SCVF igneous rocks are also chemically similar to hypabyssal intrusive rocks of similar ages that crop out to the west; together these ~29-20 Ma rocks imply that WA initiation occurred over a <100 km belt, ~50-60 km inboard from the modern WA and current loci of arc magmatism that extends from Mt. Drum to Mt.Churchill.iv

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The effect of seamount chain subduction and accretion

Yang

Tong

et al. 2022

Geological Journal

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Seamount chains (oceanic plateaus, submarine ridges) are unique morphologic features on the seafloor, which resulted from the motion of the lithosphere over a convective plume. Seamount chains are being carried along by plate motions, which are eventually subducted beneath continental/oceanic plates or accreted in the accretionary complex, thus causing a series of effects in the convergent margin. In this paper, we briefly review the distribution and features of the typical modern seamount chains, including Hawaiian‐Emperor and Louisville seamount chains, Cocos, Ninetyeast and Caroline ridges, and Ogasawara Plateau, and mainly focus on the effects of seamount chains subduction and accretion. The geological effects mainly include the following: (1) deformation and tectonic erosion of the overriding plate; (2) flat‐slab subduction in the convergent margin; (3) growth of continental crust through time; (4) subduction initiation of plate tectonics; (5) generation of large earthquakes; (6) magmatism of the volcanic arc; and (7) formation of porphyry copper and gold deposits. The subduction of seamount chains resulted in similar effects in the Central Asian Orogenic Belt (CAOB) which is one of the largest and longest‐lived accretionary orogens on Earth. However, there are still many aspects that need further improvements, such as identification of the seamounts in the geological record, and geodynamic effects of subducted seamount chains. A detailed study on these sides of the seamount chains will enable us to further understand the tectonic evolution and metallogenesis of the CAOB, especially in accretionary orogenesis, continental crust growth, and subduction initiation dynamics.

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Geochemistry of Triassic flood basalts from the Yukon (Canada) segment of the accreted Wrangellia oceanic plateau

Cited by 43 publications

References 43 publications

The architecture of oceanic plateaus revealed by the volcanic stratigraphy of the accreted Wrangellia oceanic plateau

The architecture of oceanic plateaus revealed by the volcanic stratigraphy of the accreted Wrangellia oceanic plateau

Initiation of the Wrangell Arc: A Record of Tectonic Changes in an Arc-Transform Junction Revealed by New Geochemistry and Geochronology of the ~29–18 Ma Sonya Creek Volcanic Field, Alaska

The effect of seamount chain subduction and accretion

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