Evidence for interaction of a spreading ridge with the outer California borderland

Marsaglia, Kathleen M.; Davis, Alicé S.; Rimkus, Karl C.; Clague, David A.

doi:10.1016/j.margeo.2006.02.006

Cited by 14 publications

(6 citation statements)

References 47 publications

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“…The chemical compositions of clasts in the tuff (Grechin et al, 1981), although highly altered, are similar to lavas from Rodriguez, San Juan and Northeast Bank . The deposits were proposed to be from eruptions related to extensional tectonics (Marsaglia et al, 2006), such as occurred at these seamounts (Davis et al, 1995, rather than to the more felsic, subductionrelated volcanism distributed throughout the borderland (Grechin et al, 1981;Vedder et al, 1981;Marsaglia et al, 2006). Within this unit are fossiliferous layers dated to 10-12 Ma (references within Marsaglia et al, 2006), the same time frame as the volcanic activity at the seamounts .…”

Section: Vesicle Shapes Distribution and Abundancesmentioning

confidence: 99%

“…The deposits were proposed to be from eruptions related to extensional tectonics (Marsaglia et al, 2006), such as occurred at these seamounts (Davis et al, 1995, rather than to the more felsic, subductionrelated volcanism distributed throughout the borderland (Grechin et al, 1981;Vedder et al, 1981;Marsaglia et al, 2006). Within this unit are fossiliferous layers dated to 10-12 Ma (references within Marsaglia et al, 2006), the same time frame as the volcanic activity at the seamounts . If these deposits are from Rodriguez or San Juan, they confirm the repeated, explosive nature of the eruptions, indicate that the eruptive products were voluminous and dispersed over distances on the order of 100 km, and further support the conclusion that the volcanoes were subaerial.…”

Section: Vesicle Shapes Distribution and Abundancesmentioning

confidence: 99%

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Evidence that three seamounts off southern California were ancient islands

2009

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Section: Vesicle Shapes Distribution and Abundancesmentioning

confidence: 99%

Section: Vesicle Shapes Distribution and Abundancesmentioning

confidence: 99%

Evidence that three seamounts off southern California were ancient islands

2009

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“…The second type includes circular volcanoes with large summit calderas that formed adjacent to active mid‐ocean ridges (Clague et al. 2000; Davis & Clague 2000) and includes Vance E and President Jackson G. In contrast, Patton Escarpment is the only non‐seamount site (Marsaglia et al. 2006) where Acesta were collected.…”

Section: Methodsmentioning

confidence: 99%

“…Samples were collected from two types of seamounts along the Oregon ⁄ California margin. The first type includes elongate volcanic seamounts in a wide range of sizes, ages, and depths, built on or near tectonically 'abandoned' midocean ridges where the California margin evolved from a subduction to a transform boundary (Davis et al 2002 (Marsaglia et al 2006) where Acesta were collected. The escarpment is the modern continental slope off southern California, formed as an accretionary prism when the region was a subduction zone in the Cretaceous.…”

Section: Geological Settingmentioning

confidence: 99%

Phylogeography of Acesta clams from submarine seamounts and escarpments along the western margin of North America

et al. 2011

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Genetic connectivity and habitat characteristics were examined in two species of Acesta clams (Bivalvia: Limidae) from submarine seamounts and continental slopes along the western North America margin. Two species were identified from dive videos obtained with submarine remotely operated vehicles that surveyed a 2200‐km range between 27° and 46° N latitude. Acesta sphoni was only found at shallower habitats (545–860 m depth) in the southern part of this range, whereas Acesta mori was more abundant and widely distributed in deeper habitats (1029–1996 m). Both species occurred on seamounts and on the walls of submarine canyons and continental slopes. Segregation of these species by depth exposes them to correlated differences in water temperatures and dissolved oxygen concentrations. Ninety‐eight individuals sampled from seven seamounts and one escarpment locality were characterized with DNA‐barcodes based on 643 base pairs of mitochondrial cytochrome‐c‐oxidase subunit I (COI). Further analysis of these sequences revealed no significant geographical subdivision across the sampled range. This lack of differentiation suggests ongoing genetic exchange between the seamount populations and those possibly distributed along the continental margins. Examination of regional bathymetric profiles suggested that an abundance of suitable habitat might exist along these margins.

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“…The trench may have been abandoned as the result of microplate capture or have been the first locus of transform motion and gradually abandoned as the plate boundary (San Andreas System) migrated eastward across the forearc through time owing to triple junction instability (Ingersoll, 1982). The trench-slope has also been modified by the effects of subducting young ocean crust and/or ridge interaction (Meltzer and Levander, 1991), where near-trench magmatism and forearc uplift and erosion along the Patton escarpment are recorded in the sedimentary section (Marsaglia et al, 2006). Anderson R u ss ia n R iv e r g ra ve l A number of characteristic features of the Chile triple junction (Fig.…”

Section: Triple Junctionsmentioning

confidence: 99%

Sedimentation at Plate Boundaries in Transition

Marsaglia

2011

Tectonics of Sedimentary Basins

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From inception to termination convergent margins are dynamic regions. Subduction initiation is poorly understood with arguments for both induced and spontaneous processes. Geodynamic models help to predict the sedimentary-volcanic records of such events, but there are few areas where these models have been tested, particularly pre-Cenozoic examples. Where subduction is induced, the sedimentary signatures should include evidence for rapid uplift (unconformity), then rapid subsidence (finingand deepening-upward succession), followed by building of the arc edifice. Where subduction is spontaneous, the proto-forearc experiences subsidence and early magmatism prior to development of the magmatic arc. Once initiated, there are other opportunities for tectonic overprinting of the forearc owing to the formation and migration of plate triple junctions. There are several well-studied modern to Cenozoic examples that suggest differing signatures depending on the plate configuration. In the case of a triple junction involving purely subduction (trench-trench-trench) the overriding signature is associated with arc terrane accretion, whereas the interaction of a spreading ridge at a trench-ridge-trench triple junction can result in anomalous neartrench magmatism, thermal overprinting of the forearc, and subduction erosion. In triple-junction cases where subduction is superceded by transform plate motion (e.g., trench-fault-fault) the transition is marked by progressive uplift and deformation of the forearc concomitant with cessation of arc magmatism. The demise of a convergent margin can be through simple abandonment and subsidence, or transition to a transform plate margin, or where a spreading ridge is involved, result in deformation, uplift, and thermal/volcanic overprinting of the forearc prior to abandonment.

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Evidence for interaction of a spreading ridge with the outer California borderland

Cited by 14 publications

References 47 publications

Evidence that three seamounts off southern California were ancient islands

Evidence that three seamounts off southern California were ancient islands

Phylogeography of Acesta clams from submarine seamounts and escarpments along the western margin of North America

Sedimentation at Plate Boundaries in Transition

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