Inherited Pb isotopic records in olivine antecryst-hosted melt inclusions from Hawaiian lavas

Sakyi, Patrick Asamoah; Tanaka, Ryoji; Kobayashi, Katsura; Nakamura, Eizo

doi:10.1016/j.gca.2012.07.025

Cited by 35 publications

(22 citation statements)

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“…Therefore, magma chambers may act as density filters that prevent the earliest fractionation products (i.e., high-NiO olivines) from being erupted. Alternatively, based on extensive data from Icelandic lava flows, Thomson and Maclennan (2013) suggest that the majority of olivine phenocrysts are not in chemical equilibrium with their surrounding magma and that the olivine phenocrysts have resided in cumulate mush piles at the base of crustal magma chambers, where high NiO concentrations in olivine are likely to have been muted by diffusive re-equilibration [note that deformed olivine phenocrysts in picritic Hawaiian lavas have also been used to argue that they are not directly related to their entraining magma (e.g., Garcia 1996; Baker et al 1996; Sakyi et al 2012)]. Thus, magma chambers may act as density filters preventing primitive olivines from erupting and/or (given sufficient residence times) serving to homogenize olivine compositions through diffusive re-equilibration.…”

Section: Discussionmentioning

confidence: 99%

The effect of liquid composition on the partitioning of Ni between olivine and silicate melt

Matzen

Baker

Beckett

et al. 2016

Contrib Mineral Petrol

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We report the results of experiments designed to separate the effects of temperature and pressure from liquid composition on the partitioning of Ni between olivine and liquid, . Experiments were performed from 1300 to 1600 °C and 1 atm to 3.0 GPa, using mid-ocean ridge basalt (MORB) glass surrounded by powdered olivine in graphite–Pt double capsules at high pressure and powdered MORB in crucibles fabricated from single crystals of San Carlos olivine at one atmosphere. In these experiments, pressure and temperature were varied in such a way that we produced a series of liquids, each with an approximately constant composition (~12, ~15, and ~21 wt% MgO). Previously, we used a similar approach to show that for a liquid with ~18 wt% MgO is a strong function of temperature. Combining the new data presented here with our previous results allows us to separate the effects of temperature from composition. We fit our data based on a Ni–Mg exchange reaction, which yields Each subset of constant composition experiments displays roughly the same temperature dependence of (i.e.,) as previously reported for liquids with ~18 wt% MgO. Fitting new data presented here (15 experiments) in conjunction with our 13 previously published experiments (those with ~18 wt% MgO in the silicate liquid) to the above expression gives = 3641 ± 396 (K) and = − 1.597 ± 0.229. Adding data from the literature yields = 4505 ± 196 (K) and = − 2.075 ± 0.120, a set of coefficients that leads to a predictive equation for applicable to a wide range of melt compositions. We use the results of our work to model the melting of peridotite beneath lithosphere of varying thickness and show that: (1) a positive correlation between NiO in magnesian olivine phenocrysts and lithospheric thickness is expected given a temperature-dependent and (2) the magnitude of the slope for natural samples is consistent with our experimentally determined temperature dependence. Alternative processes to generate the positive correlation between NiO in magnesian olivines and lithospheric thickness, such as the melting of olivine-free pyroxenite, are possible, but they are not required to explain the observed correlation of NiO concentration in initially crystallizing olivine with lithospheric thickness.Electronic supplementary materialThe online version of this article (doi:10.1007/s00410-016-1319-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

The effect of liquid composition on the partitioning of Ni between olivine and silicate melt

Matzen

Baker

Beckett

et al. 2016

Contrib Mineral Petrol

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“…However, small blebs of melt trapped in growing magmatic phenocrysts at depth-referred to as melt inclusions-have been shown to host extreme geochemical heterogeneity that is not observed in analyses of individual whole-rock lavas. Melt inclusions from a single lava can host heterogeneous Pb (e.g., Saal et al, 1998Saal et al, , 2005Yurimoto et al, 2004;Maclennan, 2008;Sakyi et al, 2012;Borisova et al, 2014; inclusions from a single olivine-rich scoria (the "Puu Wahi" eruption) from Mauna Loa, Hawaii.…”

Section: Introductionmentioning

confidence: 99%

Sr and Nd isotopic compositions of individual olivine-hosted melt inclusions from Hawai'i and Samoa: Implications for the origin of isotopic heterogeneity in melt inclusions from OIB lavas

et al. 2018

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ReuseThis article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can't change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. ABSTRACTGeochemical investigations of mantle heterogeneity as sampled by ocean island basalts (OIB) have long relied on isotopic analyses of whole rock lavas. However, recent work has shown that significant isotopic disequilibrium can exist between the phases (groundmass and phenocrysts) of a single OIB lava. In this study, we target individual olivine hosted melt inclusions from two lavas-one Samoan and one Hawaiian-with melt inclusion 87 Sr/ 86 Sr heterogeneity previously observed using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). We report 87 Sr/ 86 Sr and 143 Nd/ 144 Nd in individual melt inclusions using thermal ionization mass spectrometry (TIMS). In melt inclusions from Samoan sample AVON3-71-2, we find highly heterogeneous (935 ppm) 87 Sr/ 86 Sr (0.705193 -0.705853, N=6), consistent with previously identified 87 Sr/ 86 Sr heterogeneity (~2030 ppm) by laser ablation multicollector ICP-MS (0.70459 -0.70602, N=12). In contrast, we find very little (251 ppm) 87 Sr/ 86 Sr Cabral et al., 2014;Rose-Koga et al., 2012 and Sr (Jackson and Hart, 2006;Harlou et al., 2009;Sobolev et al., 2011) isotopic compositions that span much of the variability observed in oceanic lavas globally. Despite their volumetrically minor contribution to the whole rock lava, the isotopic diversity preserved in melt inclusions provides important information about mantle melting and the processes that operate in magma chambers. The origin of the chemical and isotopic diversity in melt inclusions remains the source of debate, but has most often been attributed to either assimilation of oceanic crust or mixing of isotopically heterogeneous pristine mantle melts (e.Only a handful of studies have examined Sr isotopic compositions of olivine hosted melt inclusions from ocean island basalt (OIB) lavas. Jackson and Hart (2006) were the first to target individual olivine-hosted melt inclusions for Sr isotopic analysis, utilizing laser ablation multicollector inductively coupled plasma mass spectrometry (ICP-MS) to analyze melt inclusions from Samoan picrites. Jackson and Hart (2006) found 87 Sr/ 86 Sr variability within olivine-hosted melt inclusions from a single basalt as large as 3400 ppm, which is 13% of the total range observed in the lavas from the ocean basins (i.e., 0.7021 [Schilling et al., 1994;Fontignie and Schilling, 1996] to 0.7205 [Jackson et al., 2007]). This result was reinforced by the work of ...

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“…This has informed the premise that many large crystals, rather than being phenocrysts, should be regarded as antecrysts that formed prior to emplacement at depth (Charlier et al, 2005;Davidson et al, 2007;Gill et al, 2006;Hildreth and Wilson, 2007;Jerram and Martin, 2008;Larrea et al, 2013). The complexity within antecrysts implies the existence of complex magma plumbing systems with episodes of contamination, recharge and magma mixing (Francalanci et al, 2012;Sakyi et al, 2012;Ubide et al, 2014a;Ubide et al, 2014b). Events of recharge into deep magma chambers with a more primitive (often fluid-rich) batch of magma have been studied with particular interest as they are considered the main cause for triggering volcanic eruptions (e.g., Kent, 2013;Kent et al, 2010;Longpré et al, 2014;Myers et al, 2014;Reubi and Blundy, 2007).…”

Section: Introductionmentioning

confidence: 99%

High-resolution LA-ICP-MS trace element mapping of igneous minerals: In search of magma histories

et al. 2015

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Inherited Pb isotopic records in olivine antecryst-hosted melt inclusions from Hawaiian lavas

Cited by 35 publications

References 118 publications

The effect of liquid composition on the partitioning of Ni between olivine and silicate melt

The effect of liquid composition on the partitioning of Ni between olivine and silicate melt

Sr and Nd isotopic compositions of individual olivine-hosted melt inclusions from Hawai'i and Samoa: Implications for the origin of isotopic heterogeneity in melt inclusions from OIB lavas

High-resolution LA-ICP-MS trace element mapping of igneous minerals: In search of magma histories

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