Pore Network Modeling of Core Forming Melts in Planetesimals. / Solferino, Giulio; Thomson, Paul-Ross; Hier-Majumder, Saswata.

In: Frontiers in Earth Science, Vol. 8, 339, 31.08.2020, p. 1-15.

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Pore Network Modeling of Core Forming Melts in Planetesimals. / Solferino, Giulio; Thomson, Paul-Ross; Hier-Majumder, Saswata.

In: Frontiers in Earth Science, Vol. 8, 339, 31.08.2020, p. 1-15.

Research output: Contribution to journalArticlepeer-review

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@article{3344f463ac034c688aa553150c6c2871,
title = "Pore Network Modeling of Core Forming Melts in Planetesimals",
abstract = "Early in the history of the solar system, planetesimals were differentiated into metallic cores. In some planetesimals, this differentiation took place by percolation of the denser core forming liquid through a lighter solid silicate matrix. A key factor in core formation by percolation is the establishment of a connection threshold of the melt. In this work, we report new results from pore network modeling of 3D microtomographic images of 11 synthetic olivine aggregates containing Fe-FeS melt. Our results demonstrate that a melt volume fraction of 0.14 is required to achieve connectivity of the melt. We also show that surface-tension driven melt segregation during annealing experiments plays an important role in controlling this threshold melt fraction. We also report that, contrary to the generally accepted notion, melt pinch-off is caused by reduction in pore size, rather than melt drainage out of throats. Using the results of our study, we estimate that the peak melt segregation velocity in a planetesimal of 100 km radius can be as high as 41 m/yr and core segregation can be completed in less than 0.5 million years.",
keywords = "Digital Rock Physics, Planetesimals, Planetary accretion, Core formation, X-ray Microtomoraphy",
author = "Giulio Solferino and Paul-Ross Thomson and Saswata Hier-Majumder",
year = "2020",
month = aug,
day = "31",
doi = "10.3389/feart.2020.00339",
language = "English",
volume = "8",
pages = "1--15",
journal = "Frontiers in Earth Science",
issn = "2296-6463",
publisher = "Frontiers Media S.A.",

}

RIS

TY - JOUR

T1 - Pore Network Modeling of Core Forming Melts in Planetesimals

AU - Solferino, Giulio

AU - Thomson, Paul-Ross

AU - Hier-Majumder, Saswata

PY - 2020/8/31

Y1 - 2020/8/31

N2 - Early in the history of the solar system, planetesimals were differentiated into metallic cores. In some planetesimals, this differentiation took place by percolation of the denser core forming liquid through a lighter solid silicate matrix. A key factor in core formation by percolation is the establishment of a connection threshold of the melt. In this work, we report new results from pore network modeling of 3D microtomographic images of 11 synthetic olivine aggregates containing Fe-FeS melt. Our results demonstrate that a melt volume fraction of 0.14 is required to achieve connectivity of the melt. We also show that surface-tension driven melt segregation during annealing experiments plays an important role in controlling this threshold melt fraction. We also report that, contrary to the generally accepted notion, melt pinch-off is caused by reduction in pore size, rather than melt drainage out of throats. Using the results of our study, we estimate that the peak melt segregation velocity in a planetesimal of 100 km radius can be as high as 41 m/yr and core segregation can be completed in less than 0.5 million years.

AB - Early in the history of the solar system, planetesimals were differentiated into metallic cores. In some planetesimals, this differentiation took place by percolation of the denser core forming liquid through a lighter solid silicate matrix. A key factor in core formation by percolation is the establishment of a connection threshold of the melt. In this work, we report new results from pore network modeling of 3D microtomographic images of 11 synthetic olivine aggregates containing Fe-FeS melt. Our results demonstrate that a melt volume fraction of 0.14 is required to achieve connectivity of the melt. We also show that surface-tension driven melt segregation during annealing experiments plays an important role in controlling this threshold melt fraction. We also report that, contrary to the generally accepted notion, melt pinch-off is caused by reduction in pore size, rather than melt drainage out of throats. Using the results of our study, we estimate that the peak melt segregation velocity in a planetesimal of 100 km radius can be as high as 41 m/yr and core segregation can be completed in less than 0.5 million years.

KW - Digital Rock Physics

KW - Planetesimals

KW - Planetary accretion

KW - Core formation

KW - X-ray Microtomoraphy

U2 - 10.3389/feart.2020.00339

DO - 10.3389/feart.2020.00339

M3 - Article

VL - 8

SP - 1

EP - 15

JO - Frontiers in Earth Science

JF - Frontiers in Earth Science

SN - 2296-6463

M1 - 339

ER -