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

Hoernle, Kaj; Hauff, Folkmar; Bogaard, Paul van den; Werner, Reinhard; Mortimer, Nick; Geldmacher, Jörg; Garbe‐Schönberg, Dieter; Davy, Bryan

doi:10.1016/j.gca.2010.09.030

Cited by 154 publications

(152 citation statements)

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“…2a,c). The northern Kermadec arc lavas are also characterized 17,19 ). However, if projected beneath the arc, the Rapuhia Scarp subducts approximately beneath the Kibblewhite volcanic centre (B34.2°S; Fig.…”

Section: Resultsmentioning

confidence: 99%

“…1) [16][17][18][19] . Subduction of 15-23-km thick, altered and buoyant Hikurangi Plateau crust, that is host to large seamounts 19,20 , must not only have a strong effect on tectonic erosion and the local plate stress regime, but also on volatile element budgets in the overlying mantle. This in turn suggests significant implications for the petrogenesis and eruptive behaviour of arc volcanoes, fluid-flow in their associated hydrothermal systems, and element transfer to the oceans.…”

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confidence: 99%

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Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

et al. 2014

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Large igneous province subduction is a rare process on Earth. A modern example is the subduction of the oceanic Hikurangi Plateau beneath the southern Kermadec arc, offshore New Zealand. This segment of the arc has the largest total lava volume erupted and the highest volcano density of the entire Kermadec arc. Here we show that Kermadec arc lavas south of B32°S have elevated Pb and Sr and low Nd isotope ratios, which argues, together with increasing seafloor depth, forearc retreat and crustal thinning, for initial Hikurangi Plateau-Kermadec arc collision B250 km north of its present position. The combined data set indicates that a much larger portion of the Hikurangi Plateau (the missing Ontong Java Nui piece) than previously believed has already been subducted. Oblique plate convergence caused southward migration of the thickened and buoyant oceanic plateau crust, creating a buoyant 'Hikurangi' mélange beneath the Moho that interacts with ascending arc melts.

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Section: Resultsmentioning

confidence: 99%

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Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

et al. 2014

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“…The SKP volcanism was almost entirely subaerial, with a very early and short-lived submarine phase found at ODP Site 1136. Possible sources of the upper Aptian metal anomalies are the Hikurangi Plateau (Hoernle et al, 2010) and/or younger, post-major constructional phases of the OJP and Manihiki Plateau (Timm et al, 2011). Concomitantly, or alternatively, hydrothermal fi elds linked to the initial submarine volcanism of the SKP (Coffi n et al, 2002;Duncan, 2002) might have been responsible for the metal enrichments.…”

Section: Excess Co 2 During Lip Emplacement: Climate Change and Oceanmentioning

confidence: 99%

“…The Ar dating of the GOJE provides ages ranging from 126 to 117 Ma (Mahoney et al, 1993;Tejada et al, 1996Tejada et al, , 2002Chambers et al, 2004;Hoernle et al, 2010;Timm et al, 2011). More specifi cally, a compilation of radiometric ages from OJP basement lavas (Timm et al, 2011, fi g. 2 therein) shows 19 of 24 dates (79%) in the interval 124-120 Ma, which we take as the estimated age of the main plateau-building phase.…”

Section: Geochronology Of Volcanic Activity and Of Paleoceanographic mentioning

confidence: 99%

Environmental consequences of Ontong Java Plateau and Kerguelen Plateau volcanism

Erba¹,

Duncan²,

Bottini³

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The Origin, Evolution, and Environmental Impact of Oceanic Large Igneous Provinces

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The mid-Cretaceous was marked by emplacement of large igneous provinces (LIPs) that formed gigantic oceanic plateaus, affecting ecosystems on a global scale, with biota forced to face excess CO 2 resulting in climate and ocean perturbations. Volcanic phases of the Ontong Java Plateau (OJP) and the southern Kerguelen Plateau (SKP) are radiometrically dated and correlate with paleoenvironmental changes, suggesting causal links between LIPs and ecosystem responses. Aptian biocalcifi cation crises and recoveries are broadly coeval with C, Pb, and Os isotopic anomalies, trace metal infl uxes, global anoxia, and climate changes. Early Aptian greenhouse or supergreenhouse conditions were followed by prolonged cooling during the late Aptian, when OJP and SKP developed, respectively. Massive volcanism occurring at equatorial versus high paleolatitudes and submarine versus subaerial settings triggered very different climate responses but similar disruptions in the marine carbonate system. Excess CO 2 arguably induced episodic ocean acidifi cation that was detrimental to

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“…During the expansion phase, previously referred to as main formation phase, massive eruptions of tholeiitic basalts occurred (Lanphere & Dalrymple 1976;Shipboard Scientific Party 1976;Mahoney et al 1993;Larson & Erba 1999;Hoernle et al 2010;Timm et al 2011), resulting in anomalously thick oceanic crust (Hussong et al 1979) that comprises a thickness up to 20 km on the High Plateau (Hochmuth et al, in preparation). Secondary volcanism (∼100-65 Ma) consisted of alkaline volcaniclastics (Ingle et al 2007;Hoernle et al 2010;Timm et al 2011), which broadened and flattened the topographic appearance of the High Plateau and preferentially occurred at the margins of the High Plateau (Pietsch & Uenzelmann-Neben 2015).…”

Section: The Manihiki Plateaumentioning

confidence: 99%