Thermodynamic modeling of melt addition to peridotite: Implications for the refertilization of the non-cratonic continental mantle lithosphere

Pin, Juliette; France, Lydéric; Lambart, Sarah; Reisberg, Laurie

doi:10.1016/j.chemgeo.2022.121050

Cited by 6 publications

(7 citation statements)

References 115 publications

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“…After each increment of melt impregnation, the infiltrated melt will eventually be equilibrated with surrounding peridotite, and the thermodynamic properties of the whole system are adopted as a reference for the next increment. In each increment, the proportions and compositions of melt and solid phases after chemical re‐equilibrium can be obtained by finding the minimum Gibbs energy of the whole system (Pin et al., 2022; Yao et al., 2018). This process is modeled by constantly adding up to 200 g of the lower basaltic melt by increments of 0.5 g, to 100 g of the upper peridotite, using the pMELTS of alphaMELTS (Ghiorso & Sack, 1995; Ghiorso et al., 2002; Smith & Asimow, 2005) in isenthalpic mode at 1.5 GPa, 1,250–1,300°C and ∆QFM‐2.0.…”

Section: Discussionmentioning

confidence: 99%

“…The melt‐peridotite reaction here is modeled as a simplified, thermodynamic process in which the peridotite is continually impregnated by a finite amount of basaltic melt from the lower melt source, which is the same as the assumption in previous works (Lambart et al., 2012; Pin et al., 2022; Shaw et al., 2018). After each increment of melt impregnation, the infiltrated melt will eventually be equilibrated with surrounding peridotite, and the thermodynamic properties of the whole system are adopted as a reference for the next increment.…”

Section: Discussionmentioning

confidence: 99%

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Experimental Investigation on the Transport of Sulfide Driven by Melt‐Rock Reaction in Partially Molten Peridotite

et al. 2023

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Sulfide is a ubiquitous phase in the mantle (Alard et al., 2011) and an important repository for sulfur and geochemically and economically important chalcophile metals, which plays a pivotal role in the partitioning behaviors of PGE, Cu, and Ni (Mungall & Brenan, 2014;Patten et al., 2013). Understanding the factors that control the fate of sulfide phases in the partially molten mantle is of fundamental importance in exploring the recycling of sulfur and chalcophile elements among different geochemical reservoirs (

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Experimental Investigation on the Transport of Sulfide Driven by Melt‐Rock Reaction in Partially Molten Peridotite

et al. 2023

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“…Wang et al, 2020). On the other hand, a thermodynamically-constrained mixing model has been recently used to examine the variations of major element compositions of minerals during the melt-peridotite interaction (Lambart et al, 2012;Pin et al, 2022;Shaw et al, 2018), and this forward model may offer a key to testing and understanding the compositional evolution of our experimental products.…”

Section: Compositional Variations Of Melt and Mineralsmentioning

confidence: 99%

“…The melt-peridotite reaction here is modeled as a simplified, thermodynamic process in which the peridotite is continually impregnated by a finite amount of basaltic melt from the lower melt source, which is the same as the assumption in previous works (Lambart et al, 2012;Pin et al, 2022;Shaw et al, 2018). After each increment of melt impregnation, the infiltrated melt will eventually be equilibrated with surrounding peridotite, and the thermodynamic properties of the whole system are adopted as a reference for the next increment.…”

Section: Compositional Variations Of Melt and Mineralsmentioning

confidence: 99%

“…After each increment of melt impregnation, the infiltrated melt will eventually be equilibrated with surrounding peridotite, and the thermodynamic properties of the whole system are adopted as a reference for the next increment. In each increment, the proportions and compositions of melt and solid phases after chemical reequilibrium can be obtained by finding the minimum Gibbs energy of the whole system (Pin et al, 2022;Yao et al, 2018). This process is modeled by constantly adding up to 200 g of the lower basaltic melt by increments of 0.5 g, to 100 g of the upper peridotite, using the pMELTS of alphaMELTS (Ghiorso et al, 2002;Ghiorso & Sack, 1995;Smith & Asimow, 2005) in isenthalpic mode at 1.5 GPa, 1,250-1,300 °C and ∆QFM-2.0.…”

Section: Compositional Variations Of Melt and Mineralsmentioning

confidence: 99%

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Experimental Investigation on the Transport of Sulfide Driven by Melt-rock Reaction in Partially Molten Peridotite

Wang

Yao

Zhou

et al. 2023

Preprint

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Extraction of sulfides from the partially molten mantle is vital to elucidate the cycling of metal and sulfur elements between different geochemical circles but has not been investigated systematically. Using laboratory experiments and theoretical calculations, this study documents systematical variations in lithologies and compositions of silicate minerals and melts, which are approximately consistent with the results of the thermodynamically-constrained model. During a melt-peridotite reaction, the dissolution of olivine and precipitation of new orthopyroxene generate an orthopyroxene-rich layer between the melt source and peridotite. With increasing reaction degree, more melt is infiltrated into and reacts with upper peridotite, which potentially enhances the concomitant upward transport of dense sulfide droplets. Theoretical analyses suggest an energetically focused melt flow with a high velocity (~ 170.9 μm/h) around sulfide droplets through the pore throat. In this energic melt flow, we, for the first time, observed the mechanical coalescence of sulfide droplets, and the associated drag force was likely driving upward entrainment of fine μm-scale sulfide. For coarse sulfide droplets whose sizes are larger than the pore throat in the peridotite, their entrainment through narrow constrictions in crystal framework seems to be physically possible only when high-degree melt-peridotite reaction drives high porosity of peridotite and channelized melt flows with extremely high velocity. Hence, the melt-rock reaction could drive and enhance upward entrainment of μm- to mm-scale sulfide in the partially molten mantle, potentially contributing to the fertilization of the sub-continental lithospheric mantle and the endowment of metal-bearing sulfide for the formation of magmatic sulfide deposits.

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Continental lithospheric mantle

Reisberg,

Aulbach

2025

Treatise on Geochemistry

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Thermodynamic modeling of melt addition to peridotite: Implications for the refertilization of the non-cratonic continental mantle lithosphere

Cited by 6 publications

References 115 publications

Experimental Investigation on the Transport of Sulfide Driven by Melt‐Rock Reaction in Partially Molten Peridotite

Experimental Investigation on the Transport of Sulfide Driven by Melt‐Rock Reaction in Partially Molten Peridotite

Experimental Investigation on the Transport of Sulfide Driven by Melt-rock Reaction in Partially Molten Peridotite

Continental lithospheric mantle

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