Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism

Scott, James M.; Waight, Tod E.; Meer, Quinten H. A. van der; Palin, J. Michael; Cooper, Alan F.; Münker, Carsten

doi:10.1002/2014gc005300

Cited by 88 publications

(67 citation statements)

References 123 publications

(260 reference statements)

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“…Whole rock major and trace elements were measured using methods identical to those used by van der Meer et al (2016). Sr, Nd, Pb and Hf isotopes were measured following the methods in Scott et al (2014b). Details on the methodology and a full data report can be found in the supplementary information.…”

Section: Methodsmentioning

confidence: 99%

“…La/Yb) and carbonatitic signatures e.g. low Ti/Eu (Scott et al, 2014a(Scott et al, , 2014bMcCoy-West et al, 2016;Dalton et al, 2017). Unmetasomatised portions of lithosphere under the former fore-arc area have distinctly more radiogenic Nd (>+15.5) and extend to less radiogenic Sr (∼0.702) compositions (Scott et al, 2014b;McCoy-West et al, 2016;Dalton et al, 2017).…”

Section: Zealandia's Lithospheric Mantlementioning

confidence: 99%

“…Tappenden, 2003;Sprung et al, 2007;McCoy-West et al, 2010) compared to Cretaceous seamounts on the Hikurangi Plateau , Cenozoic intraplate volcanism (Timm et al, 2010) and Tasman MORB (Mortimer et al, 2012). Second column shows comparison with mantle reservoirs; the Anita Peridotite (Czertowicz et al, 2016), peridotites from Cenozoic intraplate centres (Scott et al, 2014a(Scott et al, , 2014b and Cretaceous exhumed peridotites from Westland and the Chatham Islands (McCoy-West et al, 2016). For explanation of the four different symbols for Westland Alkaline Lamprophyres see Fig.…”

Section: Crustal Contamination Fractional Crystallisation and The Almentioning

confidence: 99%

“…6), particularly for peridotites that record the most intense metasomatism (Scott et al, 2014a(Scott et al, , 2014b. At typical temperatures for spinel facies lithosphere (900-1100 • C), slow diffusion of REE and related elements will result in isotopic disequilibrium in Nd and Hf between metasomatised and depleted domains within the lithosphere (e.g.…”

Section: Mantle Source Of the Westland Dike Swarmmentioning

confidence: 99%

“…A suite of Sr-Nd-Pb-Hf isotope data from the most geographically extensive -but least studied -intraplate occurrence in New Zealand (the Cretaceous Westland Dike Swarm, Waight et al, 1998a;van der Meer et al, 2013van der Meer et al, , 2016, coupled with published data from elsewhere in Zealandia, is used here to examine the mantle sources for these intraplate alkaline magmas. Our dataset comprises 49 new samples and >150 published samples and is the first to be compared against the Zealandia peridotite mantle SrNd-Pb-Hf isotope reference frames recently established by Scott et al (2014aScott et al ( , 2014bScott et al ( , 2016, Czertowicz et al (2016), McCoy-West et al (2016) and Dalton et al (2017). This dataset permits analysis of the temporal and spatial isotopic variability of intraplate magma sources on a continental-scale.…”

Section: Introductionmentioning

confidence: 99%

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Variable sources for Cretaceous to recent HIMU and HIMU-like intraplate magmatism in New Zealand

Meer

Waight²,

Scott

et al. 2017

Earth and Planetary Science Letters

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Section: Methodsmentioning

confidence: 99%

Section: Zealandia's Lithospheric Mantlementioning

confidence: 99%

Section: Crustal Contamination Fractional Crystallisation and The Almentioning

confidence: 99%

Section: Mantle Source Of the Westland Dike Swarmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variable sources for Cretaceous to recent HIMU and HIMU-like intraplate magmatism in New Zealand

Meer

Waight²,

Scott

et al. 2017

Earth and Planetary Science Letters

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Trace element and Sr isotope records of multi‐episode carbonatite metasomatism on the eastern margin of the North China Craton

Deng

Liu

Zong

et al. 2017

Geochem Geophys Geosyst

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Lherzolite xenoliths entrained in the Changle Cenozoic basalts were analyzed to infer mantle process beneath the eastern block of the North China Craton. These xenoliths were classified into two types. Clinopyroxenes (Cpx) in the type-1 xenoliths are strongly enriched in large ion lithophile elements and light rare earth elements (LREE) but depleted in high field-strength elements and heavy rare earth elements, and show high Ca/Al, Zr/Hf, and (La/Yb) N ratios but low Ti/Eu ratios. These features indicate that they were crystallized from a carbonatitic melt. Cpx in the type-2 xenoliths are mostly characterized by a chemical zonation, that is, LREE and Sr contents and (La/Yb) N and Eu/Ti ratios gradually increase from the cores to the rims. Some fresh cores preserve the original signatures of the depleted mantle. These observations indicate partial modification of pre-existing Cpx by carbonatite metasomatism. Two episodes of metasomatism were identified based on Sr isotopic compositions of Cpx and carbonate inclusions within olivines. Both the carbonate inclusions and Cpx cores in the type-2 xenoliths have relatively high 87 Sr/ 86 Sr ratios (>0.7033), suggesting metasomatism due to CO 2 -rich silicate melt derived from the recycled oceanic crust. However, low 87 Sr/ 86 Sr ratios of Cpx rims in the type-2 xenoliths suggest a late stage of metasomatism by a low-87 Sr/ 86 Sr carbonatitic melt (<0.7024), which might have been caused by upwelling of the asthenosphere mantle. Such multiple metasomatism could have played an important role in changing the chemical composition of mantle from refractory and depleted to fertile and enriched.

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High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO₂‐H₂O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity

Saha

Dasgupta

Tsuno

2018

Geochem Geophys Geosyst

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We present phase equilibria experiments on a depleted peridotite (Mg# 92) fluxed with variable proportions of a slab‐derived rhyolitic melt (with 9.4 wt.% H2O, 5 wt.% CO2), envisaging an interaction that could occur during formation of continents by imbrication of slabs/accretion of subarc mantles. Experiments were performed with 5 wt.% (Bulk 2) and 10 wt.% (Bulk 1) melt at 950–1175°C and 2–4 GPa using a piston‐cylinder and a multi‐anvil apparatus, to test the hypothesis that volatile‐bearing mineral‐phases produced during craton formation can cause reduction in aggregate shear‐wave velocities (VS) at mid‐lithospheric depths beneath continents. In addition to the presence of olivine, orthopyroxene, clinopyroxene, and garnet/spinel, phlogopite (Bulk 1: 3–7.6 wt.%; Bulk 2: 2.6–5 wt.%) at 2–4 GPa, and amphibole (Bulk 1: 3–9 wt.%; Bulk 2: 2–6 wt.%) at 2–3 GPa (≤1050°C) are also present. Magnesite (Bulk 1: ∼1 wt.% and Bulk 2: ∼0.6 wt.%) is present at 2–4 GPa (<1000°C at 3 and < 1050°C at 4 GPa) and its thermal breakdown coincides with the visual appearance of trace‐melt. However, an extremely small fraction of melt is inferred at all experiments based on the knowledge of fluid‐saturated peridotite solidus and the difference between bulk H2O and total H2O stored in the hydrous phases. Calculated mineral end‐member volume‐proportions were used to calculate VS of the resulting assemblage at experimental conditions and along representative continental geotherms (surface heat flow of 40–50 mWm−2). We note that reactive crystallization of phlogopite ± amphibole by infiltration of 3–10% slab‐derived hydrous‐silicic melt can cause up to 6% reduction in VS and that the estimated reduction in VS increases with increasing melt:rock ratio. The presence of phlogopite limits amphibole‐stability, making phlogopite a more likely candidate for MLDs at >100 km depth.

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Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism

Cited by 88 publications

References 123 publications

Variable sources for Cretaceous to recent HIMU and HIMU-like intraplate magmatism in New Zealand

Variable sources for Cretaceous to recent HIMU and HIMU-like intraplate magmatism in New Zealand

Trace element and Sr isotope records of multi‐episode carbonatite metasomatism on the eastern margin of the North China Craton

High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO₂‐H₂O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity

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Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism

Cited by 88 publications

References 123 publications

Variable sources for Cretaceous to recent HIMU and HIMU-like intraplate magmatism in New Zealand

Variable sources for Cretaceous to recent HIMU and HIMU-like intraplate magmatism in New Zealand

Trace element and Sr isotope records of multi‐episode carbonatite metasomatism on the eastern margin of the North China Craton

High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO2‐H2O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity

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High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO₂‐H₂O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity