Osbourn Trough: Structure, geochemistry and implications of a mid-Cretaceous paleospreading ridge in the South Pacific

Worthington, T.J.; Hékinian, Roger; Stoffers, Peter; Kühn, Thomas; Hauff, Folkmar

doi:10.1016/j.epsl.2006.03.018

Cited by 69 publications

(75 citation statements)

References 57 publications

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“…3a) and sampled. The northernmost two seamounts Moa and Tuatara (i.e., the Osbourn seamounts) are located on crust that formed at the Osbourn Spreading Center (Worthington et al, 2006). As noted below, Kiore Seamount is compositionally identical to the seamounts on the plateau and thus will be grouped with the Hikurangi seamounts.…”

Section: Geological Overview Morphology and Rock Typesmentioning

confidence: 97%

“…It has been proposed that the Manihiki and Hikurangi plateaus were once linked and that they rifted apart at the Osbourn Trough (Billen and Stock, 2000;Worthington et al, 2006;Davy et al, 2008) at >115 Ma (Mortimer et al, 2006) and even that both of these plateaus were once connected to the Ontong Java Plateau to form a mega-plateau (Taylor, 2006). Although there is not a direct overlap in the compositions obtained thus far from the Manihiki and Hikurangi plateaus, the isotopic composition of the basement of the two plateaus lie along a common array, consistent with derivation from common sources.…”

Section: Relationship Between Hikurangi Manihiki and Ontong Java Plamentioning

confidence: 99%

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Age and geochemistry of volcanic rocks from the Hikurangi and Manihiki oceanic Plateaus

Hoernle

Hauff

Bogaard

et al. 2010

Geochimica et Cosmochimica Acta

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Section: Geological Overview Morphology and Rock Typesmentioning

confidence: 97%

Section: Relationship Between Hikurangi Manihiki and Ontong Java Plamentioning

confidence: 99%

Age and geochemistry of volcanic rocks from the Hikurangi and Manihiki oceanic Plateaus

Hoernle

Hauff

Bogaard

et al. 2010

Geochimica et Cosmochimica Acta

Self Cite

160

145

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“…Billen and Stock, 2000) and possibly also to the Ontong Java Plateau (Taylor, 2006;Worthington et al, 2006;Davy et al, 2008), fractionation could potentially explain these discrepancies. Nevertheless, the incompatible element abundances are not consistent with derivation from melting of an upper mantle MORB or plateau-basement source peridotite.…”

Section: Origin Of Hikurangi Seamount Volcanismmentioning

confidence: 99%

Erratum to K. Hoernle, F. Hauff, P. van den Bogaard, R. Werner, N. Mortimer, J. Geldmacher, D. Garbe-Schönberg, B. Davy (2010) “Age and geochemistry of volcanic rocks from the Hikurangi and Manihiki oceanic Plateaus”, Geochimica et Cosmochimica Acta 74, 7196–7219

Hoernle

2012

Geochimica et Cosmochimica Acta

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Here we present the first radiometric age data and a comprehensive geochemical data set (including major and trace element and Sr-Nd-Pb-Hf isotope ratios) for samples from the Hikurangi Plateau basement and seamounts on and adjacent to the plateau obtained during the R/V Sonne 168 cruise, in addition to age and geochemical data from DSDP Site 317 on the Manihiki Plateau. The 40 Ar/ 39 Ar age and geochemical data show that the Hikurangi basement lavas (118-96 Ma) have surprisingly similar major and trace element and isotopic characteristics to the Ontong Java Plateau lavas (ca. 120 and 90 Ma), primarily the Kwaimbaita-type composition, whereas the Manihiki DSDP Site 317 lavas (117 Ma) have similar compositions to the Singgalo lavas on the Ontong Java Plateau. Alkalic, incompatible-element-enriched seamount lavas (99-87 Ma and 67 Ma) on the Hikurangi Plateau and adjacent to it (Kiore Seamount), however, were derived from a distinct high time-integrated U/Pb (HIMU)-type mantle source. The seamount lavas are similar in composition to similar-aged alkalic volcanism on New Zealand, indicating a second wide-spread event from a distinct source beginning ca. 20 Ma after the plateau-forming event. Tholeiitic lavas from two Osbourn seamounts on the abyssal plain adjacent to the northeast Hikurangi Plateau margin have extremely depleted incompatible element compositions, but incompatible element characteristics similar to the Hikurangi and Ontong Java Plateau lavas and enriched isotopic compositions intermediate between normal mid-ocean-ridge basalt (N-MORB) and the plateau basement. These younger ($52 Ma) seamounts may have formed through remelting of mafic cumulate rocks associated with the plateau formation. The similarity in age and geochemistry of the Hikurangi, Ontong Java and Manihiki Plateaus suggest derivation from a common mantle source. We propose that the Greater Ontong Java Event, during which $1% of the Earth's surface was covered with volcanism, resulted from a thermo-chemical superplume/dome that stalled at the transition zone, similar to but larger than the structure imaged presently beneath the South Pacific superswell. The later alkalic volcanism on the Hikurangi Plateau and the Zealandia micro-continent may have been part of a second large-scale volcanic event that may have also triggered the final breakup stage of Gondwana, which resulted in the separation of Zealandia fragments from West Antarctica.

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“…The age at which spreading at the Osbourn Trough ceased is not well constrained because it occurred within Chron C34 (a ~37 m.y. long interval of normal polarity), but recent estimates suggest that spreading may have continued until between ~86 and ~93 Ma (Downey et al, 2007;Worthington et al, 2006). Thus, the oldest seamounts in the Louisville Seamount Trail may have formed on relatively young, thin lithosphere.…”

Section: Age Relations Along the Louisville Seamount Trailmentioning

confidence: 99%

Expedition 330 summary

Koppers¹,

Yamazaki²,

Geldmacher³

2012

Proceedings of the IODP

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Osbourn Trough: Structure, geochemistry and implications of a mid-Cretaceous paleospreading ridge in the South Pacific

Cited by 69 publications

References 57 publications

Age and geochemistry of volcanic rocks from the Hikurangi and Manihiki oceanic Plateaus

Age and geochemistry of volcanic rocks from the Hikurangi and Manihiki oceanic Plateaus

Erratum to K. Hoernle, F. Hauff, P. van den Bogaard, R. Werner, N. Mortimer, J. Geldmacher, D. Garbe-Schönberg, B. Davy (2010) “Age and geochemistry of volcanic rocks from the Hikurangi and Manihiki oceanic Plateaus”, Geochimica et Cosmochimica Acta 74, 7196–7219

Expedition 330 summary

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