Oligo-Miocene subduction-related volcanism of the Loyalty and Three Kings ridges, SW Pacific: a precursor to the Tonga-Kermadec arc

Agranier, Arnaud; Patriat, M.; Mortimer, Nick; Collot, Julien; Étienne, Samuel; Durance, Patricia; Gans, P. B.

doi:10.1016/j.lithos.2022.106981

Cited by 3 publications

(15 citation statements)

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“…The threefold geochemical and isotopic subdivision from Agranier et al. (2023) is illustrated in Figure 5. We use this figure to further interpret the dated lavas in terms of their possible tectonic setting of eruption.…”

Section: Resultsmentioning

confidence: 99%

“…Map after Mortimer and Scott (2020); South Fiji Basin spreading ridge geometry from Herzer et al (2011) and MacLeod et al (2017). Agranier et al (2023). Labels show how the regional terms Loyalty and Three Kings Ridges, and Norfolk Basin (bold italic uppercase text) include smaller basins, troughs, terraces, and ridges (italic lowercase text).…”

Section: Vespa Expeditionmentioning

confidence: 99%

“…The separate geochemical and petrotectonic classifications of samples are given in Table 1. The same information is presented with geochemical analyses in the main supplemental data file of Agranier et al (2023). In Figure 5, two geochemically enriched lavas lie on the mid-ocean ridge basalt to ocean island basalt (MORB-OIB) mantle array and the rest lie well above it.…”

Section: Sample Typesmentioning

confidence: 99%

“…Dated VESPA samples plotted on a Nb/Yb vs Th/Yb diagram(Pearce, 2014). Figure shows classification in terms of geochemical and isotopic composition(Agranier et al, 2023) and interpreted petrotectonic setting of eruption (this paper). Reference data fromBernardel et al (2002) andMortimer et al (2007).…”

mentioning

confidence: 95%

“…This paper builds on previously published results from the VESPA voyage (Lawrence et al., 2020; Mortimer et al., 2021; Patriat et al., 2018) as well as results from previous research cruises to the region (Ballance et al., 1999; Bernardel et al., 2002; Crawford, 2004; Herzer et al., 2011; Meffre et al., 2006; Mortimer et al., 1998, 2007, 2010, 2014, 2018; Seton et al., 2016; Sutherland et al., 2019). This is a companion paper to one that addresses the geochemistry and petrogenesis of VESPA lavas (Agranier et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

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Detailed ⁴⁰Ar/³⁹Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

Gans

Mortimer

Patriat

et al. 2023

Geochem Geophys Geosyst

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The 2015 VESPA voyage (Volcanic Evolution of South Pacific Arcs) was a seismic and rock dredging expedition to the Loyalty and Three Kings Ridges and South Fiji Basin. In this paper we present 33 40Ar/39Ar, 22 micropaleontological, and two U/Pb ages for igneous and sedimentary rocks from 33 dredge sites in this little-studied part of the southwest Pacific Ocean. Igneous rocks include basalts, dolerites, basaltic andesites, trachyandesites, and a granite. Successful Ar/Ar dating of altered and/or low-K basalts was achieved through careful sample selection and processing, detailed petrographic and element mapping of groundmass, and incremental heating experiments on both phenocryst and groundmass separates to interpret the complex spectra produced by samples having multiple K reservoirs. The 40Ar/39Ar ages of most of the sampled lavas, irrespective of composition, are latest Oligocene to earliest Miocene (25-22 Ma); two are Eocene (39-36 Ma). The granite has a U/Pb zircon age of 23.6 ± 0.3 Ma. 40Ar/39Ar lava ages are corroborated by microfossil ages from associated sedimentary rocks. The VESPA lavas are part of a >3000 km long disrupted belt of Eocene to Miocene subduction-related volcanic rocks. The belt includes arc rocks in Northland New Zealand, Northland Plateau, Three Kings Ridge, and Loyalty Ridge and, speculatively, D'Entrecasteaux Ridge. This belt is the product of superimposed Eocene and Oligocene-Miocene remnant volcanic arcs that were stranded along and near the edge of Zealandia while still-active arc belts migrated east with the Pacific trench.Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site. Key Points► A major pulse of 25-22 Ma volcanism is documented on the Loyalty and Three Kings Ridges, southwest Pacific Ocean ► The ridges are part of a more than 3000 km long belt of Eocene to Miocene remnant volcanic arcs, stranded along the edge of Zealandia ► With care in sample selection, and petrological work, meaningful Ar/Ar ages can be obtained from altered and/or very low-K submarine basalts Plain Language SummarySamples of lava from the seabed between New Zealand and New Caledonia have been dated using atomic clocks and fossils. Most lavas erupted in a big pulse of volcanic activity between 25 and 22 million years ago. They are part of a belt of now-extinct undersea volcanoes that stretches for more than 3000 km between New Zealand and the Solomon Islands. These volcanoes were formed by subduction of the Pacific Plate under the Australian Plate.

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Section: Resultsmentioning

confidence: 99%

Section: Vespa Expeditionmentioning

confidence: 99%

Section: Sample Typesmentioning

confidence: 99%

mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Detailed ⁴⁰Ar/³⁹Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

Gans

Mortimer

Patriat

et al. 2023

Geochem Geophys Geosyst

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The Norfolk Ridge: A Proximal Record of the Tonga‐Kermadec Subduction Initiation

Collot

Sutherland

Étienne

et al. 2023

Geochem Geophys Geosyst

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New geochemical and age constraints ( ⁴⁰ Ar/ ³⁹ Ar and U–Pb) on forearc intrusive rocks from the New Caledonia Ophiolite (SW Pacific): diversity of melts generated at hot subduction inception

Cluzel,

Montanini,

Secchiari

et al. 2024

JGS

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New Caledonia Ophiolite is crosscut by coarse to medium grained pyroxenites and hornblende gabbros/diorites dykes intruded between 55.5Ma and 50Ma (U-Pb zircon and 40 Ar/ 39 Ar hornblende), while finer-grained dolerites of tholeiitic affinity are younger (50-47 Ma). Production of hornblende-gabbros/diorites was modelled by moderate degree (20-40%) of partial melting of the HT amphibolites of the metamorphic sole. End-member compositions, hornblendites and anorthosites, resulted from solid-state phase segregation of crystal mushes within tectonically active magmatic conduits. Cascade reactions of slab melts with mantle wedge peridotites successively formed clinoenstatite-boninite magmas, which fed gabbronorite cumulate lenses at the mantle-crust transition, in turn clinoenstatite-boninite melts reacted with peridotites to form websterites. The youngest magmas of tholeiitic affinity, appeared about 6 Ma after subduction inception when the cooler subducting slab plunged more steeply. Incipient slab retreat allowed corner flow, triggering low pressure hydrous melting of the uplifted asthenosphere . The early stages of forearc magmatism were closely associated with transcurrent shear zones, which recorded oblique subduction inception. The lower Eocene tectonic and magmatic features of the New Caledonia ophiolite witness the existence of a north- or northeast-dipping hot (forced) subduction zone in the Southwest Pacific, which appears notably distinct from the slightly younger west-dipping Izu-Bonin-Marianna cold (spontaneous) subduction system. Thematic collection: This article is part of the Ophiolites, melanges and blueschists collection available at: https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists Supplementary material: https://doi.org/10.6084/m9.figshare.c.6949265

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Oligo-Miocene subduction-related volcanism of the Loyalty and Three Kings ridges, SW Pacific: a precursor to the Tonga-Kermadec arc

Cited by 3 publications

References 61 publications

Detailed ⁴⁰Ar/³⁹Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

Detailed ⁴⁰Ar/³⁹Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

The Norfolk Ridge: A Proximal Record of the Tonga‐Kermadec Subduction Initiation

New geochemical and age constraints ( ⁴⁰ Ar/ ³⁹ Ar and U–Pb) on forearc intrusive rocks from the New Caledonia Ophiolite (SW Pacific): diversity of melts generated at hot subduction inception

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Oligo-Miocene subduction-related volcanism of the Loyalty and Three Kings ridges, SW Pacific: a precursor to the Tonga-Kermadec arc

Cited by 3 publications

References 61 publications

Detailed 40Ar/39Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

Detailed 40Ar/39Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

The Norfolk Ridge: A Proximal Record of the Tonga‐Kermadec Subduction Initiation

New geochemical and age constraints ( 40 Ar/ 39 Ar and U–Pb) on forearc intrusive rocks from the New Caledonia Ophiolite (SW Pacific): diversity of melts generated at hot subduction inception

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Detailed ⁴⁰Ar/³⁹Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

Detailed ⁴⁰Ar/³⁹Ar Geochronology of the Loyalty and Three Kings Ridges Clarifies the Extent and Sequential Development of Eocene to Miocene Southwest Pacific Remnant Volcanic Arcs

New geochemical and age constraints ( ⁴⁰ Ar/ ³⁹ Ar and U–Pb) on forearc intrusive rocks from the New Caledonia Ophiolite (SW Pacific): diversity of melts generated at hot subduction inception