Isotopic evidence for the origin of the Manihiki and Ontong Java oceanic plateaus

Mahoney, John J.; Spencer, Khalil J.

doi:10.1016/0012-821x(91)90204-u

Cited by 148 publications

(116 citation statements)

References 42 publications

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“…Beiersdorf et al (1995) surveyed volcanic rocks covering a high seamount NE of DSDP Site 317, at the eastern edge of the Manihiki Plateau, just SW of Rakahanga Atoll. Their work confirmed the results of Mahoney and Spencer (1991), indicating a hotspot involvement during the formation of the plateau basement. Additional analyses of these and other Manihiki Plateau samples by Ingle et al (2007) show that several distinct mantle sources were involved.…”

Section: Nassau P E N R H Y N B a S In C E N T R A L B A S I N O F T supporting

confidence: 82%

“…The presence of a hotspot is suggested by the isotopic analysis for basalts of the plateau done by Mahoney and Spencer (1991) and Beiersdorf et al (1995), who noted that basalts of the Manihiki Plateau fall well within the category of oceanic island or near-ridge hotspots. By 120 Ma, the activity of the hotspot had created the basement of the original Manihiki Plateau, and formed the top of the basement.…”

Section: Model For Manihiki Plateau Evolutionmentioning

confidence: 99%

“…In major element composition, these basement basalts are of MORB-like tholeiitic type ). Mahoney and Spencer (1991) Sr/ 86 Sr indicative of mantle sources. They concluded that the sources of the basalts fall well within the modern-day oceanic island or hotspot field.…”

Section: Nassau P E N R H Y N B a S In C E N T R A L B A S I N O F T mentioning

confidence: 99%

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Vertical tectonics of the High Plateau region, Manihiki Plateau, Western Pacific, from seismic stratigraphy

Stock

Clayton

et al. 2008

Mar Geophys Res

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The Manihiki Plateau is an elevated oceanic volcanic plateau that was formed mostly in Early Cretaceous time by hotspot activity. We analyze new seismic reflection data acquired on cruise KIWI 12 over the High Plateau region in the southeast of the plateau, to look for direct evidence of the location of the heat source and the timing of uplift, subsidence and faulting. These data are correlated with previous seismic reflection lines from cruise CATO 3, and with the results at DSDP Site 317 at the northern edge of the High Plateau. Seven key reflectors are identified from the seismic reflection profiles and the resulting isopach maps show local variations in thickness in the southeastern part of the High Plateau, suggesting a subsidence (cooling) event in this region during Late Cretaceous and up to Early Eocene time. We model this as a hotspot, active and centered on the High Plateau area during Early Cretaceous time in a near-ridge environment. The basement and Early Cretaceous volcaniclastic layers were formed by subaerial and shallow-water eruption due to the volcanic activity. After that, the plateau experienced erosion. The cessation of hotspot activity and subsequent heat loss by Late Cretaceous time caused the plateau to subside rapidly. The eastern and southern portions of the High Plateau were rifted away following the cessation of hot spot activity. As the southeastern portion of the High Plateau was originally higher and above the calcium carbonate compensation depth, it accumulated more sediments than the surrounding plateau regions. Apparently coeval with the rapid subsidence of the plateau are normal faults found at the SE edge of the plateau. Since Early Eocene time, the plateau subsided to its present depth without significant deformation.

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Section: Nassau P E N R H Y N B a S In C E N T R A L B A S I N O F T supporting

confidence: 82%

Section: Model For Manihiki Plateau Evolutionmentioning

confidence: 99%

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Vertical tectonics of the High Plateau region, Manihiki Plateau, Western Pacific, from seismic stratigraphy

Stock

Clayton

et al. 2008

Mar Geophys Res

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“…Leached Sr analyses were obtained by subjecting a split of the sample powders to a harsh, multi-step technique using repeated attacks of 6 N HCl during soni¢cation, in order to remove a seawater Sr signature from altered rocks [11].…”

Section: Methodsmentioning

confidence: 99%

A trapped Philippine Sea plate origin for MORB from the inner slope of the Izu–Bonin trench

DeBari

Taylor

Spencer

et al. 1999

Earth and Planetary Science Letters

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Basement outcrops sampled by submersible and dredge from the inner slope of the Izu^Bonin trench at 32³N and 6200^6700 m water depth have a distinct mid-ocean ridge basalt (MORB) chemistry unlike any other rocks previously sampled in the Izu^Bonin arc. They are low K tholeiites with moderate TiO 2 (0.7^1.8 wt%), extremely low Ba (1.5^7 parts per million), low Ba/La (1.2^3) and are depleted in light rare-earth elements. These samples could represent either an accreted piece of subducting Pacific plate or a trapped remnant of Philippine Sea plate on which the Izu^Bonin arc was built. Although their major and trace element chemistry do not help to distinguish their source, the Sr, Nd and Pb isotopes clearly support a Philippine Sea plate origin. The isotopic signature of the inner trench slope samples matches that of Philippine Sea plate lavas, with 87 2) values compared to the Northern Hemisphere reference line (NHRL) and their isotopic signature is distinct from the Mesozoic Pacific MORB being subducted. These are the first samples of trapped Philippine Sea oceanic crust discovered in the IzuB onin^Mariana arc. They require that models for the formation of intra-oceanic arc crust account for pre-existing oceanic crust and that estimates of arc magma production rates are lowered accordingly. ß 1999 Elsevier Science B.V. All rights reserved.

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“…Such a determination would prove or disprove the hypothesis that the Ontong Java Plateau formed from massive large igneous province volcanism at ~120 Ma, when the preceding plume head of the Louisville mantle upwelling reached the base of the Pacific lithosphere and started extensive partial melting (e.g., Richards and Griffiths, 1989;Mahoney and Spencer, 1991).…”

Section: Objectivesmentioning

confidence: 93%

Site U1373

2012

Proceedings of the IODP

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Isotopic evidence for the origin of the Manihiki and Ontong Java oceanic plateaus

Cited by 148 publications

References 42 publications

Vertical tectonics of the High Plateau region, Manihiki Plateau, Western Pacific, from seismic stratigraphy

Vertical tectonics of the High Plateau region, Manihiki Plateau, Western Pacific, from seismic stratigraphy

A trapped Philippine Sea plate origin for MORB from the inner slope of the Izu–Bonin trench

Site U1373

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