Fe–Mg Partitioning between Olivine and High-magnesian Melts and the Nature of Hawaiian Parental Liquids

Matzen, A. K.; Baker, M. B.; Beckett, J. R.; Stolper, Edward M.

doi:10.1093/petrology/egq089

Cited by 157 publications

(92 citation statements)

References 97 publications

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“…Olivine is by far the dominant mineral found in mantle xenoliths and it generally has a composition close to Fo 90 (ibid). Recent experiments have shown that K D Mg-Fe Ol-Liq is dependent on temperature, olivine composition and melt composition but the observation that it tends to be close to 0.3 in natural systems is because the effects of these parameters cancel out (Toplis 2005;Matzen et al 2011). Thus, these authors noted that a K D Mg-Fe Ol-Liq value of 0.3 (Mg# = 0.72 atomic and Mg/Fe t = 1 wt.…”

Section: Data Selection and Preparationmentioning

confidence: 98%

Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Greenough

MacKenzie

2015

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SUMMARYIncompatible elements and isotopic ratios identify three endmember mantle components in oceanic island basalt (OIB); EM1, EM2, and HIMU. We estimate compatible to mildly incompatible transition metal abundance trends (Ni, Co, Fe, Cu, Cr, V, Mn, Sc, and Zn) in 'primitive' basalt suites (Mg# = Mg/(Mg + 0.9*Fe) atomic = 0.72) from 12 end-member oceanic islands by regressing metals against Fe/Mg ratios in sample suites, and solving for concentrations at Mg/Fe = 1 (Mg# = 0.72). Using the transition metal estimates, exploratory statistics reveal that islands 'group' based on mantle component type even when La/Yb ratios are used to compensate metal concentrations for percentage melting. Higher chalcophile Zn (and Pb, earlier work) in EM1 and EM2 compared to HIMU, and higher Cr (3+) and Sc in HIMU relative to EM1, support views that HIMU represents subductionprocessed ocean floor basalt. Incompatible elements, ratios and isotopes indicate that EM1 is Archean, EM2 is Proterozoic or younger, and both are related to sediment subduction. As found with incompatible elements, EM1 and EM2 show similar 'compatible' element concentrations, but lower (multivalence) Cr, Fe and Mn in EM1 could indirectly reflect increasing oxidation of subducted sediment between the Archean and Proterozoic. Alternatively, changes in subduction processes that yielded peak continental formation in the Neoarchean, and craton-suturing in the Paleoproterozoic may account for EM1-EM2 differences. EM1 shows similar or lower Cr, Ni and Co compared to HIMU and EM2 suggesting that economic viability of layered intrusions, which have extreme EM1-like signatures, is unrelated to high metals in EM1 mantle sources, but that high % melting appears important. Because core-concentrated transition metals correlate with mantle component type, lithospheric recycling apparently controls their concentrations in OIB and core-mantle interaction may be unimportant. RÉSUMÉLes éléments incompatibles et les rapports isotopiques permettent de délimiter trois termes extrêmes de composants mantéliques dans des basaltes insulaires océaniques (OIB), soit EM1, EM2, et HIMU. Nous estimons les tendances d'abondance de métaux de transition (Ni, Co, Fe, Cu, Cr, V, Mn, Sc, and Zn) compatibles à modérément incompatibles dans des suites de basaltes « primitifs » (Mg# = Mg/(Mg + 0,9*Fe) rayon atomique = 0,72) sur 12 termes extrêmes de matériaux insulaires océaniques, par régression des concentrations des métaux sur les rapports Fe/Mg dans des échantillons des suites, la détermination étant définie au rapport Mg/Fe = 1 (Mg# = 0,72). L'utilisation d'une approche statistique exploratoire sur les estimations de métaux de transition montre que la composition des îles se « regroupent » en fonction du type de composition du manteau, cela même lorsque les ratios La/Yb sont utilisés pour compenser les concentrations de métaux pour déterminer le pourcentuel de fusion. Le caractère plus chalcophile du Zn (et Pb, travail antérieur) dans EM1 et EM2 comparé à HIMU, et la plus grande teneur en Cr ...

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Section: Data Selection and Preparationmentioning

confidence: 98%

Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Greenough

MacKenzie

2015

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“…There are many published parameterizations of the temperature dependence of the MgO concentration of melt in equilibrium with olivine (e.g., Roeder and Emslie 1970;Sugawara 2000;Chen and Zhang 2008;Putirka 2008;Matzen et al 2011) and also many published olivine-liquid equilibrium models (Ford et al 1983;Beattie 1993;Ghiorso and Sack 1995). We opted for the relatively simple model of Chen and Zhang (2008), which, in addition to simplicity, also has the advantage that the experiments used to determine the temperature dependence of MgO concentration in the liquid at the olivine-melt interface were also used to determine the temperature dependence of the diffusivity of MgO in the melt (which is another important parameter in our model).…”

Section: Thermometermentioning

confidence: 99%

Chemical zonation in olivine-hosted melt inclusions

Newcombe

Fabbrizio

Zhang

et al. 2014

Contrib Mineral Petrol

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International audienceSignificant zonation in major, minor, trace, and volatile elements has been documented in naturally glassy olivine-hosted melt inclusions from the Siqueiros Fracture Zone and the Galapagos Islands. Components with a higher concentration in the host olivine than in the melt (e.g., MgO, FeO, Cr2O3, and MnO) are depleted at the edges of the zoned melt inclusions relative to their centers, whereas except for CaO, H2O, and F, components with a lower concentration in the host olivine than in the melt (e.g., Al2O3, SiO2, Na2O, K2O, TiO2, S, and Cl) are enriched near the melt inclusion edges. This zonation is due to formation of an olivine-depleted boundary layer in the adjacent melt in response to cooling and crystallization of olivine on the walls of the melt inclusions, concurrent with diffusive propagation of the boundary layer toward the inclusion center. Concentration profiles of some components in the melt inclusions exhibit multicomponent diffusion effects such as uphill diffusion (CaO, FeO) or slowing of the diffusion of typically rapidly diffusing components (Na2O, K2O) by coupling to slow diffusing components such as SiO2 and Al2O3. Concentrations of H2O and F decrease toward the edges of some of the Siqueiros melt inclusions, suggesting either that these components have been lost from the inclusions into the host olivine late in their cooling histories and/or that these components are exhibiting multicomponent diffusion effects. A model has been developed of the time-dependent evolution of MgO concentration profiles in melt inclusions due to simultaneous depletion of MgO at the inclusion walls due to olivine growth and diffusion of MgO in the melt inclusions in response to this depletion. Observed concentration profiles were fit to this model to constrain their thermal histories. Cooling rates determined by a single-stage linear cooling model are 150–13,000 °C h−1 from the liquidus down to ~1,000 °C, consistent with previously determined cooling rates for basaltic glasses; compositional trends with melt inclusion size observed in the Siqueiros melt inclusions are described well by this simple single-stage linear cooling model. Despite the overall success of the modeling of MgO concentration profiles using a single-stage cooling history, MgO concentration profiles in some melt inclusions are better fit by a two-stage cooling history with a slower-cooling first stage followed by a faster-cooling second stage; the inferred total duration of cooling from the liquidus down to ~1,000 °C ranges from 40 s to just over 1 h. Based on our observations and models, compositions of zoned melt inclusions (even if measured at the centers of the inclusions) will typically have been diffusively fractionated relative to the initially trapped melt; for such inclusions, the initial composition cannot be simply reconstructed based on olivine-addition calculations, so caution should be exercised in application of such reconstructions to correct for post-entrapment crystallization of olivine on inclusion walls....

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“…This composition (OS87a) corresponds to 20 % olivine (Fo 87 ) in a primitive carrier melt (13 wt% MgO). The composition of this primitive carrier melt was determined by calculating the melt in equilibrium with Fo 87 olivine using the Fe = Mg olivine-melt exchange coefficient (Kd = 0.34) of Matzen et al (2011) with all Fe as FeO. This calculated carrier melt is more primitive than the FCSC chill, indicating that the melts in equilibrium with this olivine were unfractionated and that the melt at the end of the WUS OZ array defined in Fig.…”

Section: Component 2: Olivine Slurrymentioning

confidence: 99%

“…This second potential olivine slurrymixing pole (OS86a: Fig. 9b, c) would contain 30 % olivine (Fo 86 ) and a carrier melt with 12 wt% MgO, also calculated using the olivine-melt Fe = Mg exchange coefficient of Matzen et al (2011). More olivine-rich slurry-mixing poles can also be defined.…”

Section: Component 2: Olivine Slurrymentioning

confidence: 99%

The geochemical effects of olivine slurry replenishment and dolostone assimilation in the plumbing system of the Franklin Large Igneous Province, Victoria Island, Arctic Canada

Hayes

Lissenberg

Bédard

et al. 2015

Contrib Mineral Petrol

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westward evolution toward more Fe-rich bulk compositions. This is best explained by progressive mixing of the replenishing olivine slurry with a resident gabbroic mush during westward flow. Pb-isotopic signatures suggest that magmas near the inferred conduit feeder assimilated small amounts (<10 %) of dolostone country rock, which may have locally buffered olivine compositions to high-Fo contents.

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Fe–Mg Partitioning between Olivine and High-magnesian Melts and the Nature of Hawaiian Parental Liquids

Cited by 157 publications

References 97 publications

Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Chemical zonation in olivine-hosted melt inclusions

The geochemical effects of olivine slurry replenishment and dolostone assimilation in the plumbing system of the Franklin Large Igneous Province, Victoria Island, Arctic Canada

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