Alexandria Digital Research Library

Molecular Dynamics Simulations of Silicate Geoliquids

Author:
Martin, George Benjamin
Degree Grantor:
University of California, Santa Barbara.Geological Sciences
Degree Supervisor:
Spera Frank
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2011
Issued Date:
2011
Topics:
Geophysics and Geochemistry
Keywords:
anorthite-diopside
Forsterite
Fayalite
planetary evolution
silicate melts
Description:

In order to understand the evolution and current state of the Earth's interior and the interior of other rocky planets, it is essential to understand the thermodynamics, melt structure, and transport properties of liquid silicates that comprise the majority of erupted magmas on Earth and the Earth's interior, namely: forsterite, fayalite, and the 1-bar eutectic composition of the system anorthite-diopside. I used Classical Molecular Dynamics methods to simulate these three systems and extract atomistic measurements that were used to calculate physical properties of these melts at high temperatures and pressures. I found that these techniques can be used to duplicate many laboratory and seismology measurements of the same properties. I also found computational evidence for melt segregation by density as an explanation for the widely held theory that the Mg,Fe/O ratio in the Earth is 2 in the upper mantle and 1 in the lower mantle.

Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/13030/m5qc045k
Merritt ARK:
ark:/13030/m5qc045k
Rights:
Inc.icon only.dark In Copyright
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