Near‐ridge seamount chains in the northeastern Pacific Ocean

Clague, David A.; Reynolds, Jennifer R.; Davis, Alicé S.

doi:10.1029/2000jb900082

Cited by 62 publications

(69 citation statements)

References 56 publications

(42 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ridge trends observed by Schouten et al [1987] and Clague et al [2000] near the EPR and MAR again fit perfectly to the trend predicted by Morgan's vector diagrams, although the morphology of the ridges seems to exclude hot spot influence. The axis‐parallel motion component of the hot spot is replaced here by a subaxis asthenosphere flow that equals the motion of the hot spot frame (but not a certain hot spot) with respect to the ridge and the authors interpret the structures to be generated by the migration of asthenosphere‐entrained volcanic segments along the ridge.…”

Section: Introductionsupporting

confidence: 75%

“…The ridges have a mean height of 2000 m and are dominated by prominent volcanoes emerging to a maximum height of 3500 m above the surrounding seafloor with a spacing from 30 km to 80 km (e.g., Donizetti Seamount in Figure 2). Despite these dominating volcanoes, the structure is significantly different from the Vance, President Jackson and Taney near‐ridge seamounts in the northeastern Pacific described by Clague et al [2000], which consist exclusively of circular, isolated seamounts on a linear chain. The overall morphology of the Musicians is rather rough.…”

Section: Morphology Of the Musicians Volcanic Elongated Ridges (Vers)mentioning

confidence: 81%

See 1 more Smart Citation

Fossil hot spot‐ridge interaction in the Musicians Seamount Province: Geophysical investigations of hot spot volcanism at volcanic elongated ridges

Kopp

Morgan

et al. 2003

J. Geophys. Res.

View full text Add to dashboard Cite

[1] The Musicians Seamount Province is a group of volcanic elongated ridges (VERs) and single seamounts located north of the Hawaiian Chain. A 327°trending seamount chain defines the western part of the province and has been interpreted as the expression of a Cretaceous hot spot beneath the northward moving Pacific Plate. To the east, elongated E-W striking ridges dominate the morphology. In 1999, wide-angle seismic data were collected across two 400 km long VERs. We present tomographic images of the volcanic edifices, which indicate that crustal thickening occurs in oceanic layer 2 rather than in layer 3. This extrusive style of volcanism appears to strongly contrast with the formation processes of aseismic ridges, where crustal thickening is mostly accommodated by intrusive underplating. High-resolution bathymetry was also collected, which yields a detailed image of the morphology of the VERs. From the occurrence of flat-top guyots and from the unique geomorphologic setting, two independent age constraints for the Pacific crust during the Cretaceous ''quiet'' zone are obtained, allowing a tectonic reconstruction for the formation of the Musicians VERs. Hot spot-ridge interaction leads to asthenosphere channeling from the plume to the nearby spreading center over a maximum distance of 400 km. The Musicians VERs were formed by mainly extrusive volcanism on top of this melt-generating channel. The proposed formation model may be applicable to a number of observed volcanic ridges in the Pacific, including the Tuamotu Isles, the eastern portion of the Foundation chain, and the western termination of the Salas y Gomez seamount chain.

show abstract

Section: Introductionsupporting

confidence: 75%

Section: Morphology Of the Musicians Volcanic Elongated Ridges (Vers)mentioning

confidence: 81%

Fossil hot spot‐ridge interaction in the Musicians Seamount Province: Geophysical investigations of hot spot volcanism at volcanic elongated ridges

Kopp

Morgan

et al. 2003

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Truncated cones with steep sides and nearly flat tops found near mid-ocean ridges (Clague et al, 2000b) and off Hawaii (Clague et al, 2000a) were interpreted to have formed when effusive flows formed overflowing lava ponds. Unsorted volcaniclastic deposits veneer the summits of those with collapsed calderas, and glassy lava pond surfaces and sheet flows form the caldera floors (Clague et al, 2006a).…”

Section: Wave-planed Summitsmentioning

confidence: 98%

“…They erupted over millions of years at East Pacific Rise spreading ridges that ceased spreading at about 18-20 Ma, and consist of a series of peaks on parallel elongate ridges (Davis et al, 1995. They are unlike most ocean-island and near-ridge volcanoes, which are also abundant farther offshore the US west coast, and which are generally isolated cones, many with pit-craters or calderas at their summits (Clague et al, 2000b).…”

Section: Regional Settingmentioning

confidence: 99%

Evidence that three seamounts off southern California were ancient islands

2009

Self Cite

View full text Add to dashboard Cite

“…Edifices ranged in height from 200 to 1700 m. The edifices showed a range of morphologies from sharp to flat topped [ Smith , 1988]. The round, flat‐topped morphology has been attributed either to overtopping caldera [ Clague et al , 2000a] or to circular eruptions such as from ring dikes [ Batiza et al , 1989; Simkin , 1972] or cone sheets [ Mitchell , 2001], and hence their eruptive geometry may differ from the larger edifices described later.…”

Section: Island and Seamount Geology And Morphological Observationsmentioning

confidence: 99%

Susceptibility of mid‐ocean ridge volcanic islands and seamounts to large‐scale landsliding

Mitchell

2003

J. Geophys. Res.

View full text Add to dashboard Cite

[1] With a view to assessing the incidence of large-scale landsliding, a morphologic database was created for volcanic islands and seamounts on young oceanic lithosphere. The database included 44 mid-ocean ridge seamounts, Jasper seamount and the islands of Ascension, Bouvet, Guadalupe, and several of the Galapagos and Azores Islands, supplemented with published reports from a further five volcanic edifices. The data reveal that major landslides are common on edifices taller than 2500 m but are rare in shorter edifices, implying a threshold of instability at around 2500 m. A number of causes of this threshold are discussed. For example, many structures taller than 2500 m are, or were originally, volcanic islands, and therefore their flanks probably include extensive weak hyaloclastite built up from lava-sea interactions around coasts. Compaction of hyaloclastites in larger edifices lead to regions of low permeability, which may help to explain the more deeply seated slope failures. It is intriguing that the threshold also coincides with the edifice height at which volcanic ridges become observable, a stage at which dike intrusion is probably common because slope oversteepening or excess pore pressure associated with dike intrusions have been proposed elsewhere as landslide triggers. The current indications of landsliding reveal no observable relation to rainfall, as landslides occur equally in wet and dry climates, and no relation to tectonic setting, as there are relatively few major landslides in the seismically active Azores group.INDEX TERMS: 3035 Marine Geology and Geophysics: Midocean ridge processes; 3022 Marine Geology and Geophysics: Marine sediments-processes and transport; 8499 Volcanology: General or miscellaneous; KEYWORDS: landslides, volcanic debris avalanche, slope stability, multibeam sonar, side-scan sonar Citation: Mitchell, N. C., Susceptibility of mid-ocean ridge volcanic islands and seamounts to large-scale landsliding,

show abstract

Near‐ridge seamount chains in the northeastern Pacific Ocean

Cited by 62 publications

References 56 publications

Fossil hot spot‐ridge interaction in the Musicians Seamount Province: Geophysical investigations of hot spot volcanism at volcanic elongated ridges

Fossil hot spot‐ridge interaction in the Musicians Seamount Province: Geophysical investigations of hot spot volcanism at volcanic elongated ridges

Evidence that three seamounts off southern California were ancient islands

Susceptibility of mid‐ocean ridge volcanic islands and seamounts to large‐scale landsliding

Contact Info

Product

Resources

About