Fivefold‐Coordinated Silicon in MgSiO3 Melt Accommodates Viscous Flow up to Transition Zone Pressures

التفاصيل البيبلوغرافية
العنوان:	Fivefold‐Coordinated Silicon in MgSiO3 Melt Accommodates Viscous Flow up to Transition Zone Pressures
المؤلفون:	Maximilian Schulze, Georg Spiekermann
المصدر:	Geophysical Research Letters, Vol 50, Iss 22, Pp n/a-n/a (2023)
بيانات النشر:	Wiley, 2023.
سنة النشر:	2023
المجموعة:	LCC:Geophysics. Cosmic physics
مصطلحات موضوعية:	MgSiO3 melt, viscosity, Earth's mantle, coordination, lifetime analysis, relaxation, Geophysics. Cosmic physics, QC801-809
الوصف:	Abstract Fivefold‐coordinated silicon is assumed to be the transitional species that accommodates the structural relaxation needed for viscous flow of silicate melts, but so far robust insight at the atomic scale is missing. Furthermore, the role of fivefold‐coordinated silicon in melts at Earth's mantle pressures is unknown. Here we discuss the relative dynamic stabilities of four‐, five‐ and sixfold Si–O coordination polyhedra in MgSiO3 melt at pressures up to 40 GPa, obtained from ab initio molecular dynamics simulations and a novel concept based on a coordination auto‐correlation function. Successfully benchmarked against the relaxation time predicted by Maxwell's relation, our results show that fivefold‐coordinated silicon accommodates structural relaxation not only at ambient pressure, but at least up to the pressures of the mantle transition zone. These results shed new light on the interplay between structure and viscosity of silicate melts.
نوع الوثيقة:	article
وصف الملف:	electronic resource
اللغة:	English
تدمد:	1944-8007 0094-8276 85942898
Relation:	https://doaj.org/toc/0094-8276; https://doaj.org/toc/1944-8007
DOI:	10.1029/2023GL105750
URL الوصول:	https://doaj.org/article/4fdf666df859428984c02f68c7adaf72
رقم الانضمام:	edsdoj.4fdf666df859428984c02f68c7adaf72
قاعدة البيانات:	Directory of Open Access Journals

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الوصف
تدمد:	19448007 00948276 85942898
DOI:	10.1029/2023GL105750