Marine geology of Rodriguez Seamount

Palmer, Harold D.

doi:10.1016/0011-7471(64)90947-7

Cited by 6 publications

(6 citation statements)

References 23 publications

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“…Analyses of 103 new samples from Rodriguez greatly expand the compositional range previously reported for the six dredge samples of Davis et al [2002] and the five dredge samples of Palmer [1964]. In addition to alkalic basalt and hawaiite, mugearite, benmoreite, and trachyte were also recovered on the dives.…”

Section: Resultsmentioning

confidence: 58%

Origin of volcanic seamounts at the continental margin of California related to changes in plate margins

Davis

Clague

Paduan

et al. 2010

Geochem Geophys Geosyst

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[1] Volcanic samples collected with the Monterey Bay Aquarium Research Institute's ROV Tiburon from eight seamounts at the continental margin offshore central to southern California comprise a diverse suite of mainly alkalic basalt to trachyte but also include rare tholeiitic basalt and basanite. All samples experienced complex crystal fractionation probably near the crust/mantle boundary, based on the presence in some of mantle xenoliths. Incompatible trace elements, poorly correlated with isotopic compositions, suggest variable degrees of partial melting of compositionally heterogeneous mantle sources, ranging from MORB-like to relatively enriched OIB. High-precision 40 Ar/ 39 Ar ages indicate episodes of volcanic activity mainly from 16 to 7 Ma but document one eruption as recent as 2.8 Ma at San Juan Seamount. Synchronous episodes of volcanism occurred at geographically widely separated locations offshore and within the continental borderland. Collectively, the samples from these seamounts have age ranges and chemical compositions similar to those from Davidson Seamount, identified as being located atop an abandoned spreading center. These seamounts appear to have a common origin ultimately related to abandonment and partial subduction of spreading center segments when the plate boundary changed from subduction-dominated to a transform margin. They differ in composition, age, and origin from other more widespread near-ridge seamounts, which commonly have circular plans with nested calderas, and from age progressive volcanoes in linear arrays, such as the Fieberling-Guadalupe chain, that occur in the same region. Each volcanic episode represents decompression melting of discrete enriched material in the suboceanic mantle with melts rising along zones of weakness in the oceanic crust fabric. The process may be aided by transtensional tectonics related to continued faulting along the continental margin.

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Section: Resultsmentioning

confidence: 58%

Origin of volcanic seamounts at the continental margin of California related to changes in plate margins

Davis

Clague

Paduan

et al. 2010

Geochem Geophys Geosyst

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“…Palmer (1964) observed the morphology and sediments on the summit of Rodriguez, and suggested it grew to sea level, was truncated by wave erosion, and then subsided. Hawkins et al (1971) suggested the same for Northeast Bank, and dredged shallow-water bivalves fossilized in freshly erupted volcanic material from more than 500 m depth.…”

Section: Seamount Geologymentioning

confidence: 96%

“…The initial suggestion that Rodriguez Seamount (Palmer, 1964) and Northeast Bank (Hawkins et al, 1971) had been subaerial was based on the flattened shape of the summit platforms and rounded breaksin-slope detected in single beam bathymetric data. The change in slope of Hawaiian islands was interpreted by Mark and Moore (1987) as a transition from gentler subaerial to steeper submarine caused by effects on volcanic processes.…”

Section: Wave-planed Summitsmentioning

confidence: 99%

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Evidence that three seamounts off southern California were ancient islands

2009

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“…Other principal methods for interpreting both shallow and deep submarine volcanic events include dredging [e.g. Davis et al, 1995;Colantoni et al, 1981;Fornari et al, 1979;Moore and Fiske, 1969;Palmer, 1964] and field observations of uplifted sequences [e.g. Goto and Tsuchiya, 2004;Busby-Spera, 1984;de Rosen-Spence et al, 1980;Cas, 1978;Dimroth et al, 1978].…”

Section: Introductionmentioning

confidence: 99%

Investigating Lava Balloon Formation: New Exploration of the 1993 Submarine Vent Site at Socorro Island, Mexico

Lubetkin¹

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The third of five known lava balloon eruptions occurred January 1993 to March 1994 west of Socorro Island, Mexico. Large highly-vesicular basaltic scoria rose to the sea surface in pulses. Buoyant samples were collected and studied, but the submarine vent was never precisely located. New multibeam mapping and remotely operated vehicle exploration in 2017 by E/V Nautilus located and sampled the 1993 vent site, a volcaniclastic cone at 250 m depth with pillow lava and large scoria blocks. An active, low-temperature hydrothermal system (0.2°C above ambient) with white filamentous Dr. Steve Carey, both of whom provided me with ongoing guidance, encouragement, and motivation throughout my time at GSO and beyond. Their combined mentorship gave me a tremendously meaningful experience. Major thanks to Dr. Dawn Cardace for her valuable feedback and time while serving on my thesis committee. Dr. David Fastovsky, merci beaucoup, I'm so grateful to have met you and had you as my defense chair.

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Marine geology of Rodriguez Seamount

Cited by 6 publications

References 23 publications

Origin of volcanic seamounts at the continental margin of California related to changes in plate margins

Origin of volcanic seamounts at the continental margin of California related to changes in plate margins

Evidence that three seamounts off southern California were ancient islands

Investigating Lava Balloon Formation: New Exploration of the 1993 Submarine Vent Site at Socorro Island, Mexico

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