Subduction of the Kula Ridge at the Aleutian Trench

DeLong, Stephen E.; Fox, Paul J.; McDowell, Fred W.

doi:10.1130/0016-7606(1978)89<83:sotkra>2.0.co;2

Cited by 118 publications

(48 citation statements)

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“…Thus, the shelf was probably subjected to further erosion in association with glacial erosion. In the Kula Ridge-Aleutian Trench collision site, shoaling and subaerial emergence of the crest of the arc were related to ridge-collision (DeLong et al, 1978). Shoaling was marked by a deep-to shallow-marine transition in sedimentation.…”

Section: Tectonic Control Over Outer Margin Depositional Systemsmentioning

confidence: 99%

“…The volcanogenic component in the sandy turbidites is more abundant throughout the Pliocene-lower Pleistocene sections than in the upper Pleistocene and evolved, silicic, vesicle-rich vitric clasts are abundant upsection in the Pleistocene record (Strand, this volume). Decrease or cessation of arc volcanism related to ridge subduction is also recorded from the subduction of the Kula Ridge beneath the Aleutian Arc (DeLong et al, 1978). Nur and Ben-Avraham (1983) identified caps in arc volcanism occurring also when aseismic ridges (e.g., Nazca Ridge and Juan Fernandez Ridge) are subducted and they suggested that this may a general phenomena where anomalous oceanic crust is being consumed.…”

Section: Tectonic Control Over Outer Margin Depositional Systemsmentioning

confidence: 99%

“…The Triple Junction reached the Golfo de Penas about 6 Ma. The main focus of the drilling was to prove the effects of spreading-ridge subduction, which was assumed to produce rapid uplift and subsidence of the arc and forearc, a cessation of arc magmatism, anomalous near-trench and forearc magmatism and localized subsidence and extensional deformation of the forearc in the region of the collision (Marshak and Karig, 1977;DeLong et al, 1978DeLong et al, , 1979Cande and Leslie, 1986;Forsythe et al, 1986;Cande et al, 1987). In addition, many convergent margins may have undergone the removal of forearc material from the overriding plate through processes of subduction erosion (Cande and Leslie, 1986;Honza et al, 1989;von Huene and Lallemand, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Outer Margin Depositional Systems near the Chile Margin Triple Junction

Strand¹,

Marsaglia²,

Forsythe³

et al. 1995

Proceedings of the Ocean Drilling Program, 141 Scientific Results

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Ocean Drilling Program Leg 141 drilling recovered an extensive suite of Pliocene to Pleistocene forearc basin deposits within the Chile margin near latitude 46°S, in the vicinity of the Chile spreading ridge-trench collision. The outer margin setting is dominated by terrigenous siliciclastic sediment input from the Andean volcanic arc, Paleozoic to Mesozoic crustal sources, and the forearc, in slightly varying proportions. The overall controls on sedimentation are complex; of major importance are fluctuations in glaciation, sea-level changes, volcanism, and tectonism (i.e., thrust faulting and uplift due to subduction accretion or subsidence due to subduction erosion).The sediments encountered are predominantly structureless muds, massive to graded sand, sandstones, and some gravels and conglomerates that were deposited from slope failures, turbidity currents, and suspension processes associated with hemipelagic fallout in basin plain/trench to stacked slope apron environments. During the late Pliocene to Pleistocene, fluctuations of the ice sheet also influenced the outer margin sedimentation; during the glacial maxima in the Pliocene and early Pleistocene, larger quantities of terrigenous sediment were transported to the trench slope by turbidity currents and related gravity flows. Tectonically induced accretion led to overall shallowing-up successions and the formation of small slope basins with a slight coarsening-upward general character in the upper portions of proximal sites. Onshore, uplifted and eroded Paleozoic metasedimentary rocks and deeper crustal complexes shed sediments of dissected arc provenance into the forearc region. Forearc sediment composition indicates a waning of the arc volcanism during the Pliocene-Pleistocene and an emplacement of subaqueous near-trench volcanism during Pliocene along the Taitao Fracture Zone, owing to the progressive spreading-ridge subduction along the Chile margin. Basinal tectonism occurred in the form of ridge-subduction-related subsidence and associated tectonic erosion. The hydrothermal alteration of part of the Chilean accretionary wedge sediments was most likely created by high heat flow from the subducted spreading ridge.

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Section: Tectonic Control Over Outer Margin Depositional Systemsmentioning

confidence: 99%

Section: Tectonic Control Over Outer Margin Depositional Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Outer Margin Depositional Systems near the Chile Margin Triple Junction

Strand¹,

Marsaglia²,

Forsythe³

et al. 1995

Proceedings of the Ocean Drilling Program, 141 Scientific Results

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“…1). The arc is being underthrust at about 90 • by the Pacific plate in the eastern part at rates of about 7.5 cm/year, whereas in the far western part the North American Plate and Pacific Plate motions be- come nearly parallel and subduction rates decline to about 2.5 cm/year (Grow and Atwater, 1970;DeLong et al, 1978;Engebretson et al, 1985).…”

Section: Regional Settingmentioning

confidence: 99%

Volcano collapse along the Aleutian Ridge (western Aleutian Arc)

Montanaro

Begét

2011

Nat. Hazards Earth Syst. Sci.

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Abstract. The Aleutian Ridge, in the western part of the Aleutian Arc, consists of a chain of volcanic islands perched atop the crest of a submarine ridge with most of the active Quaternary stratocones or caldera-like volcanoes being located on the northern margins of the Aleutian Islands. Integrated analysis of marine and terrestrial data resulted in the identification and characterization of 17 extensive submarine debris avalanche deposits from 11 volcanoes. Two morphological types of deposits are recognizable, elongate and lobate, with primary controls on the size and distribution of the volcanic debris being the volume and nature of material involved, proportion of fine grained material, depth of emplacement and the paleo-bathymetry. Volume calculations show the amount of material deposited in debris avalanches is as much as three times larger than the amount of material initially involved in the collapse, suggesting the incorporation of large amounts of submarine material during transport. The orientation of the collapse events is influenced by regional fault systems underling the volcanoes. The western Aleutian Arc has a significant tsunamigenic potential and communities within the Aleutian Islands and surrounding areas of the North Pacific as well as shipping and fishing fleets that cross the North Pacific may be at risk during future eruptions in this area.

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“…The restudies confirmed that, compared with cratonic North America (Kent and Irving 2010), paleomagnetic inclinations imply ~3000 km of northward displacement since 70 Ma, placing the Carmacks Group at the latitude of San Francisco during its eruption. It was presumably translated northward as part of the Kula plate before the latter's disappearance into the eastern Aleutian Trench ~50 Ma (DeLong et al 1978;Bradley et al 1993). Most Cordilleran geologists still reject the Baja BC hypothesis because they cannot find structures capable of accommodating large (>1000 km) displacements of the requisite age (Price and Carmichael 1986).…”

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confidence: 99%

The Tooth of Time: The North American Cordillera from Tanya Atwater to Karin Sigloch

Hoffman¹

2013

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Subduction of the Kula Ridge at the Aleutian Trench

Cited by 118 publications

References 0 publications

Outer Margin Depositional Systems near the Chile Margin Triple Junction

Outer Margin Depositional Systems near the Chile Margin Triple Junction

Volcano collapse along the Aleutian Ridge (western Aleutian Arc)

The Tooth of Time: The North American Cordillera from Tanya Atwater to Karin Sigloch

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