Stability and Migration of Slab-Derived Carbonate Melts above the Transition Zone. / Sun, Yizhuo; Hier-Majumder, Saswata; Xu, Yiagng; Walter, Michael.

In: Earth and Planetary Science Letters, 28.11.2019.

Research output: Contribution to journalArticle

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Stability and Migration of Slab-Derived Carbonate Melts above the Transition Zone. / Sun, Yizhuo; Hier-Majumder, Saswata; Xu, Yiagng; Walter, Michael.

In: Earth and Planetary Science Letters, 28.11.2019.

Research output: Contribution to journalArticle

Harvard

APA

Sun, Y., Hier-Majumder, S., Xu, Y., & Walter, M. (Accepted/In press). Stability and Migration of Slab-Derived Carbonate Melts above the Transition Zone. Earth and Planetary Science Letters.

Vancouver

Sun Y, Hier-Majumder S, Xu Y, Walter M. Stability and Migration of Slab-Derived Carbonate Melts above the Transition Zone. Earth and Planetary Science Letters. 2019 Nov 28.

Author

Sun, Yizhuo ; Hier-Majumder, Saswata ; Xu, Yiagng ; Walter, Michael. / Stability and Migration of Slab-Derived Carbonate Melts above the Transition Zone. In: Earth and Planetary Science Letters. 2019.

BibTeX

@article{8a244e84c3e743e4b1a249d076a634da,
title = "Stability and Migration of Slab-Derived Carbonate Melts above the Transition Zone",
abstract = "We present a theoretical model of the stability and migration of carbonate-rich melts to test whether they can explain seismic low-velocity layers (LVLs) observed above stalled slabs in several convergent tectonic settings. TheLVLs, located atop the mantle transition zone, contain small (∼1vol{\%})amounts of partial melt, possibly derived from melting of subducted carbonate-bearing oceanic crust. Petrological and geochemical evidence from inclusionsin superdeep diamonds supports the existence of slab-derived carbonate melt,which may potentially explain the origin of the observed melt in the LVL.However, the presumptive reducing nature of the ambient mantle can be animpediment to the stability of carbonated melt. To reconcile this appar-ent contradiction, we test the stability and migration rates of carbonate-richmelts atop a stalled slab as a function of melt percolation, redox freezing,amount of carbon supplied by subduction, and the metallic Fe concentration in the mantle. Our results demonstrate that carbonate-rich melts in the LVLcan potentially survive redox freezing over long geological time scales. Wealso show that the amount of subducted carbon exerts a stronger influence onthe stability of carbonate melt than does the mantle redox condition. Con-centration dependent melt density leads to rapid melt propagation throughchannels while a constant melt density causes melt to migrate as a planarfront. Our calculations suggest that the LVLs can sequester significant frac-tions of carbon transported to the mantle by subduction.",
keywords = "Transition Zone, Reactive Porous Flow, Volatile Cycle;, Carbonate-rich Melts, Low-velocity Layer",
author = "Yizhuo Sun and Saswata Hier-Majumder and Yiagng Xu and Michael Walter",
year = "2019",
month = "11",
day = "28",
language = "English",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Stability and Migration of Slab-Derived Carbonate Melts above the Transition Zone

AU - Sun, Yizhuo

AU - Hier-Majumder, Saswata

AU - Xu, Yiagng

AU - Walter, Michael

PY - 2019/11/28

Y1 - 2019/11/28

N2 - We present a theoretical model of the stability and migration of carbonate-rich melts to test whether they can explain seismic low-velocity layers (LVLs) observed above stalled slabs in several convergent tectonic settings. TheLVLs, located atop the mantle transition zone, contain small (∼1vol%)amounts of partial melt, possibly derived from melting of subducted carbonate-bearing oceanic crust. Petrological and geochemical evidence from inclusionsin superdeep diamonds supports the existence of slab-derived carbonate melt,which may potentially explain the origin of the observed melt in the LVL.However, the presumptive reducing nature of the ambient mantle can be animpediment to the stability of carbonated melt. To reconcile this appar-ent contradiction, we test the stability and migration rates of carbonate-richmelts atop a stalled slab as a function of melt percolation, redox freezing,amount of carbon supplied by subduction, and the metallic Fe concentration in the mantle. Our results demonstrate that carbonate-rich melts in the LVLcan potentially survive redox freezing over long geological time scales. Wealso show that the amount of subducted carbon exerts a stronger influence onthe stability of carbonate melt than does the mantle redox condition. Con-centration dependent melt density leads to rapid melt propagation throughchannels while a constant melt density causes melt to migrate as a planarfront. Our calculations suggest that the LVLs can sequester significant frac-tions of carbon transported to the mantle by subduction.

AB - We present a theoretical model of the stability and migration of carbonate-rich melts to test whether they can explain seismic low-velocity layers (LVLs) observed above stalled slabs in several convergent tectonic settings. TheLVLs, located atop the mantle transition zone, contain small (∼1vol%)amounts of partial melt, possibly derived from melting of subducted carbonate-bearing oceanic crust. Petrological and geochemical evidence from inclusionsin superdeep diamonds supports the existence of slab-derived carbonate melt,which may potentially explain the origin of the observed melt in the LVL.However, the presumptive reducing nature of the ambient mantle can be animpediment to the stability of carbonated melt. To reconcile this appar-ent contradiction, we test the stability and migration rates of carbonate-richmelts atop a stalled slab as a function of melt percolation, redox freezing,amount of carbon supplied by subduction, and the metallic Fe concentration in the mantle. Our results demonstrate that carbonate-rich melts in the LVLcan potentially survive redox freezing over long geological time scales. Wealso show that the amount of subducted carbon exerts a stronger influence onthe stability of carbonate melt than does the mantle redox condition. Con-centration dependent melt density leads to rapid melt propagation throughchannels while a constant melt density causes melt to migrate as a planarfront. Our calculations suggest that the LVLs can sequester significant frac-tions of carbon transported to the mantle by subduction.

KW - Transition Zone

KW - Reactive Porous Flow

KW - Volatile Cycle;

KW - Carbonate-rich Melts

KW - Low-velocity Layer

M3 - Article

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -