Western Pacific Guyots

Heezen, Bruce C.; Matthews, Jbl; Catalano, Raimondo; Natland, James H.; Coogan, Alan H.; Tharp, Marie; Rawson, Mac V.

doi:10.2973/dsdp.proc.20.132.1973

Cited by 38 publications

(39 citation statements)

References 20 publications

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“…Apparently fresh plagioclase from two of the fresher pieces of basalt was separated for 40 Ar/ 39 Ar dating. Also, two samples dredged from Takuyo-Daisan and its southwestern neighbor, Takuyo-Daini, during the Aries V expedition of the Scripps Institute of Oceanography (Heezen et al, 1973;Winterer et al, 1993) were chosen for 40 Ar/ 39 Ar dating to help elucidate the age of basement volcanism in the Seiko Cluster of the Japanese Seamounts.…”

Section: Takuyo-daisan Guyot (Site 879 and Dredge Samples)mentioning

confidence: 99%

Radiometric Ages of Basement Lavas Recovered at Loen, Wodejebato, MIT, and Takuyo-Daisan Guyots, Northwestern Pacific Ocean

Pringle¹,

Duncan²

1995

Proceedings of the Ocean Drilling Program, 144 Scientific Results

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The best estimate for the age of the oldest volcanism recovered from the summits of Loen, Wodejebato, MIT, and TakuyoDaisan guyots, northwestern Pacific Ocean, is 113, 83, 123, and 118 Ma, respectively. All of these sites originated in the central and western regions of the South Pacific Isotopic and Thermal Anomaly (SOPITA). The 113-Ma age for Loen Guyot is significantly different from the 76-Ma age of volcanism under the carbonate platform of its neighbor, the living Anewetak Atoll, and suggests that drowned guyot/living atoll seamount pairs may have no genetically significant relationship other than geographic proximity. Although all of the basalts recovered from the top of Wodejebato Guyot were erupted during polarity Chron 33R (ca. 79-85 Ma), both the occurrence of reworked Cenomanian calcareous nannofossils in one of the summit cores and the existence of a thick Cenomanian volcaniclastic sequence, including 94-Ma basaltic clasts, in the archipelagic apron indicate that there must have been a Cenomanian or older edifice beneath the drilled summit volcanics. AT MIT Guyot, two late-stage periods of volcanism can be recognized: late Aptian (ca. 115 Ma) phreatomagmatic eruptions through the existing volcanic and carbonate platform, and 120-Ma hawaiites seen both as exotic clasts in the 115-Ma tuffs and as lava flows at the top of the basement sequence. Also, the 122.9 ± 0.9 Ma age of two lavas in the basement lava sequence date the upper boundary of the reversed polarity Chron MIR, providing an important calibration point for the Cretaceous Geological Reversal Time Scale. The 118-Ma age of volcanism at Takuyo-Daisan Guyot is best constrained by the age of dredge basalts from its flanks and those of its neighbor to the southwest, Takuyo-Daini Seamount, but agrees well with the oldest sediments recovered at Hole 879A.

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Section: Takuyo-daisan Guyot (Site 879 and Dredge Samples)mentioning

confidence: 99%

Radiometric Ages of Basement Lavas Recovered at Loen, Wodejebato, MIT, and Takuyo-Daisan Guyots, Northwestern Pacific Ocean

Pringle¹,

Duncan²

1995

Proceedings of the Ocean Drilling Program, 144 Scientific Results

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“…1), amassed during Ocean Drilling Program (ODP) Leg 143 (Shipboard Scientific Party, 1993a, 1993b, 1993c, provide the basis for a new assessment of the morphology of the MPM guyots, especially of the morphology of the top surface of the Lower Cretaceous carbonate platform. As revealed during previous seismic-reflection and multibeam surveys (published in part in Shipboard Scientific Party, 1973;Heezen et al, 1973;Nemoto and Kroenke, 1985;van Waasbergen and Winterer, 1993), this surface is not flat, as would be expected from a simple drowning of a shallow-water carbonate platform; instead, it shows both local relief and, on most guyots, a broad doming of the upper surface. The top limestone surface is generally buried beneath a mound of younger pelagic sediments that seal the local relief on the unconformity.…”

Section: Introductionmentioning

confidence: 96%

Karst Morphology and Diagenesis of the Top of Albian Limestone Platforms, Mid-Pacific Mountains

Edward¹,

Robert²,

Mammerickx³

et al. 1995

Proceedings of the Ocean Drilling Program, 143 Scientific Results

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The upper surface of the Albian platform limestone on many Mid-Pacific Mountains (MPM) guyots, as shown by multibeamsonar, bathymetric data, and seismic-reflection data from where pelagic sediments have buried the Albian platform limestone, shows that the top of the limestone sequence has been sculptured by streams, by waves, and by dissolution during an episode of emergence to heights of as much as 180 m above sea level. Seismic-reflection profiles show that the surface is arched over the buried volcanic basement, reflecting progressive differential compaction of the limestone section over erosional relief on the basement. This compaction began during early stages of burial of limestone layers and continued after final drowning of the platform. On some guyots, differential erosion left a prominent perimeter rim several tens of meters high. This atoll-like erosional form was drowned in post-Albian, pre-mid-Turonian time, with no further accumulation of platform limestone. Petrographic and stable-isotopic studies of samples recovered in drill holes in the upper parts of the platform limestone on Allison and Resolution guyots show dissolution cavities tens of meters below the top of the limestone, some filled with pelagic sediments and others still open and lined with stalagmite-like calcite structures and cements showing evidence of accumulation in vadose environments.

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“…Five or six lines in a star pattern based on dead reckoning and broad-beam sonar is not enough information on which to base guyot morphology. These survey methods initially worked for the larger features, such as the Mid-Pacific Mountains (Heezen et al, 1973).…”

mentioning

confidence: 99%

North Pacific Guyots

Smoot¹

1991

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Western Pacific Guyots

Cited by 38 publications

References 20 publications

Radiometric Ages of Basement Lavas Recovered at Loen, Wodejebato, MIT, and Takuyo-Daisan Guyots, Northwestern Pacific Ocean

Radiometric Ages of Basement Lavas Recovered at Loen, Wodejebato, MIT, and Takuyo-Daisan Guyots, Northwestern Pacific Ocean

Karst Morphology and Diagenesis of the Top of Albian Limestone Platforms, Mid-Pacific Mountains

North Pacific Guyots

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