Lithoprobe, southern Vancouver Island: Seismic reflection sees through Wrangellia to the Juan de Fuca plate

Yorath, C J; Green, A. G.; Clowes, R. M.; Brown, A. Sutherland; Brandon, M. T.; Kanasewich, E. R.; Hyndman, R. D.; Spencer, Christopher J.

doi:10.1130/0091-7613(1985)13<759:lsvisr>2.0.co;2

Cited by 54 publications

(33 citation statements)

References 12 publications

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“…In this model, ongoing convergence continued to squeeze the Olympic rocks of the Crescent terrane against and under Vancouver Island (Yorath et al 1985). Such intraplate shortening is recorded by folds, thrust, and reverse faults in rocks along the northern Olympic Peninsula and the Vancouver Island shelf (MacLeod et al 1977;Muller et al 1983;Yorath et al 1985) and may be related to the possible emplacement of the Leech River Schist along the southern tip of Vancouver Island at about 40 Ma (Fairchild and Cowan 1982). Folding of the Olympic structure into its present broad horseshoe shape ( Fig.…”

Section: Tectonic Styles Compressional Tectonicsmentioning

confidence: 98%

“…Extension also began in the region south of the Snake River plain by this time. Minor intraplate shortening of the previously emplaced Crescent terrane (including the Olympic Mountains) beneath Wrangellia along southern Vancouver Island (Yorath et al 1985) may have occurred until about 40 Ma, coincident with cooling ages from the enigmatic Leech River Schist (Fairchild and Cowan 1982).…”

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confidence: 99%

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Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Heller¹,

Tabor²,

Suczek³

1987

Can. J. Earth Sci.

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Paleogeographic reconstructions for Oregon and Washington during Paleogene time illustrate a major transition from a dominantly compressional (prior to middle Eocene time) to an extensional tectonic regime. This transition resulted in the development of three phases of Paleogene basin evolution in the United States Pacific Northwest. During the initial phase, basins formed along the continental margin during collision of oceanic islands. Sediments in these basins were derived from nearby orogenic highlands. The second phase of basin development began in middle Eocene time and consisted of rapid subsidence of individual basins that formed within a broad forearc region. Nonmarine basins that formed during this phase were caused by extension possibly associated with transcurrent faulting. Rapid sedimentation in both marine and nonmarine basins during this time consisted dominantly of sandstone derived from Cretaceous plutonic sources far to the east. The final stage of basin development was the modification of previous basin configurations by the growth of the Cascade volcanic arc, which was initiated in early Oligocene time. The rising Cascade Range diverted streams canying eastem-derived material, thereby reducing overall sedimentation rates in the coastal basins and providing a local source of volcanic detritus.Dans les Ctats de l'Or6gon et de Washington, les reconstitutions palBogCographiques durant le PalCogbne illustrent une pCriode de transition majeure d'un regime de compression tectonique dominante (anterieur i 1'Eocbne moyen) B un rCgime de distension tectonique. Trois phases de 1'Cvolution du bassin palkogbne dans le nord-ouest Pacifique des Etats-Unis sont dues h cette transition. Au cours de la phase initiale, des bassins se formbrent le long de la marge continentale lors de la collision des iles ockaniques. Les saiments dans yes bassins provenaient des hautes terres des monts avoisinants. La seconde phase de dtveloppement du bassin dCbuta i 1'Eocttne moyen, et elle correspond B une subsidence rapide des bassins individuels qui s'ktaient formCs au coeur d'une grande region d'arc frontal. Les bassins continentaux qui se developpbrent durant cette phase doivent leur origine B une extension qui accompagnait probablement un dkcrochement. La sedimentation rapide dans les bassins marins et continentaux i cette Cpoque Ctait dominee par des g k s dCrivCs des &ions nourricsres plutoniques cr6tacCes situCes plus i l'est. L'Ctape final du dCveloppement des bassins fut la modification des configurations des bassins dCjB exitants provoquke par la croissance de l'arc volcanique des Cascades, lequel arc est apparu au dCbut de I'Oligocbne. Le soulbvement de la chaine des Cascades a modifiC la direction d'ecoulement des cours d'eau qui transportaient des matkriaux provenant de l'est, de ce fait rkduisant les taux de sedimentation moyens dans les bassins c6tiers et foumissant une source locale de detritus volcanique.[Traduit par la revue]Can.

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Section: Tectonic Styles Compressional Tectonicsmentioning

confidence: 98%

mentioning

confidence: 99%

Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Heller¹,

Tabor²,

Suczek³

1987

Can. J. Earth Sci.

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“…Much discussion occurred but finally a consensus on interpretation was reached. Subsequently, a series of papers were published (Yorath et al 1985;Green et al 1986;Clowes et al 1987). Figure 2b and 2c, extracted from Clowes et al (1987), show the data and interpretation for Line 4.…”

Section: Vancouver Island and The Initiation Of Lithoprobementioning

confidence: 99%

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

Clowes¹

2015

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“…Recently, the Canadian Lithoprobe Project (Yorath et al 1985) has been studying the structure of the subduction of the Juan de Fuca plate beneath Vancouver Island. There are complex fault structures above the subducting slab.…”

Section: Subduction and Fluids: Subduction-induced Mantle Convectionmentioning

confidence: 99%

The water inventory of the Earth: fluids and tectonics

Fyfe¹

1994

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Abstract:As the human population continues to expand, to approach ten billion, there will be an increasing demand upon all Earth's resources. Of particular importance will be resources related to energy, soil and water, all of which involve geofluids. Problems associated with waste disposal also involve systems for protecting near-surface water quality. There is an urgent need to quantify the fluid inventory and fluid dynamics of the near surface, while understanding volatiles and their deep recycling is fundamental to our understanding of the major dynamic processes of the Earth.

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Lithoprobe, southern Vancouver Island: Seismic reflection sees through Wrangellia to the Juan de Fuca plate

Cited by 54 publications

References 12 publications

Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

The water inventory of the Earth: fluids and tectonics

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