Louisville seamount subduction and its implication on mantle flow beneath the central Tonga–Kermadec arc

Timm, Christian; Bassett, Dan; Graham, Ian; Leybourne, Matthew I.; Ronde, C. E. J. de; Woodhead, Jon; Layton‐Matthews, Daniel; Watts, A. B.

doi:10.1038/ncomms2702

Cited by 57 publications

(51 citation statements)

References 62 publications

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“…A similar input of an OIB-type slab signature, including a positive gravity anomaly (GH2; Fig. 4a) can be observed further north, where the subduction of the Louisville Seamount Chain affects the central Tonga-Kermadec arc 14 . Tomography results from a trench-perpendicular ocean bottom seismometer array oriented east-west across the Kermadec trench to the Havre Trough at B37°S (refs 30,31) show zones of reduced seismic velocities (that is, Vp r7.8 km s À 1 compared with Z8 km s À 1 for mantle peridotite) beneath the arc front MOHO, consistent with Z10% of serpentenized mantle being present beneath the arc 44 .…”

Section: Resultsmentioning

confidence: 89%

“…Consequently, arc lavas carry geochemical signals from the subducting plate, which includes the sediment cover, altered oceanic crust and serpentinized mantle [10][11][12] . In addition, signals of subducting intraplate seamounts (or LIPs) with geochemical compositions different to the subarc mantle can be traced in arc lavas 13,14 . Tracing the subduction cycle of such geological features provides an improved understanding of mantle-flow pattern and may explain the variability in eruptive behaviour and style of hydrothermal activity on the overriding plate 15 .…”

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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: 89%

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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 location/timing of arrival of the Louisville Ridge at the Tonga-Kermadec trench (Figures 1 and 10) Timm et al, 2013). The geology of the forearc situated at 21°S-24°S may provide valuable information on the timing of arc gap formation and forearc uplift due to ridge collision (Figure 10a-d).…”

Section: The Louisville Ridgementioning

confidence: 99%

Rapid vertical motions and formation of volcanic arc gaps: Plateau collision recorded in the forearc geological evolution (Costa Rica margin)

2018

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The collision of bathymetric features with modern convergent margins has been investigated with the full range of tools used in geosciences. Hence, a comprehensive picture exists of the characteristic effects of collision events on the evolution of convergent margins. In contrast, much less studies documented past collisions of bathymetric features with convergent margins, as colliding features were generally lost to subduction. The arc-trench system of southern Central America provides modern and past textbook examples of active margin interaction with incoming bathymetric reliefs. Here, we propose a synthesis which combines basin and terrane analysis of the forearc of northern Costa Rica and takes up the challenge of documenting past episodes of plateau accretion to the active margin. As illustrated in modern examples, our study shows that kilometric uplift of the overriding plate and termination of the volcanic arc activity are the most profound effects of colliding/accreting oceanic plateaus. Kilometric uplift of the forearc is documented by short-lived (ca. 3 m.y.) occurrences of shallow-water deposits in an overall deep-water forearc record. These shallow deposits contain material reworked from underlying sedimentary and basement lithologies. The development of spatial gaps in arc volcanism is deduced from the transition from arcderived turbidites to pelagic sediments. Eventually, end of the collision event is evidenced by the subsidence of the whole forearc to deep-water environments.Basin subsidence is accompanied or followed by renewed volcanic arc activity and coeval arc-derived sedimentation, which may occur 1-7 m.y. after plateau collision. These past episodes of plateau accretion are archetypal for the following reasons: (a) they may be studied in outcrop, whereas most of the modern collisions of plateaus largely occur underwater; (b) no tectonic or metamorphic imprint has significantly complicated the forearc geological record; (c) the colliding feature and the sedimentary response to its collision are both preserved in the forearc geology; (d) they may be used as analogues for any setting where a bathymetric feature is suspected to have caused rapid forearc uplift and cessation of the volcanic arc activity.---

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“…This gravity anomaly across the lower-and mid-trench slopes is most likely caused by the simple bathymetric gradient across the forearc, although the higher amplitude anomaly present in the LRSC collision zone may be indicative of a currently subducting seamount (e.g. Timm et al 2013).…”

Section: R E G I O N a L C H A N G E S I N F O R E A Rc S T Ru C T U R Ementioning

confidence: 99%

“…• S on the Tonga Arc, north of the present-day LRSC collision zone, indicate that subduction of the LRSC initiated at least 7 Ma (Timm et al 2013). The most northwesterly and currently subducting seamount of the volcanic chain (which are commonly ∼2 km high and 10-40 km in diameter) causes a bathymetric discontinuity in the trench and at the lower-trench slope (Lonsdale 1988).…”

Section: Downloaded Frommentioning

confidence: 99%

Structure and deformation of the Kermadec forearc in response to subduction of the Pacific oceanic plate

Funnell¹,

Peirce²,

Stratford³

et al. 2014

Geophysical Journal International

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Louisville seamount subduction and its implication on mantle flow beneath the central Tonga–Kermadec arc

Abstract: Subduction of intraplate seamounts beneath a geochemically depleted mantle wedge provides a seldom opportunity to trace element recycling and mantle flow in subduction zones.

Cited by 57 publications

References 62 publications

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

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

Rapid vertical motions and formation of volcanic arc gaps: Plateau collision recorded in the forearc geological evolution (Costa Rica margin)

Structure and deformation of the Kermadec forearc in response to subduction of the Pacific oceanic plate

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