Partitioning behavior of moderately siderophile elements in Ni-rich systems: Implications for the earth and moon.

Persistent Link:
http://hdl.handle.net/10150/186577
Title:
Partitioning behavior of moderately siderophile elements in Ni-rich systems: Implications for the earth and moon.
Author:
Hillgren, Valerie Jane.
Issue Date:
1993
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Several scenarios set forth to explain the siderophile element abundance patterns in the mantles of the Earth and the Moon involve the segregation of Ni-rich metal to the cores of those bodies under oxidizing conditions. To test these models, the partition coefficients of Ni, Co, Mo, W, P, and Ga between basaltic liquid, Ni-rich metal, and Ni-rich sulfide were experimentally determined under a wide range of oxygen fugacities. The partition coefficients are then used in mass balance calculations to test these scenarios involving oxidizing conditions during the formation of both the Earth's and the Moon's cores. The results show that the siderophile element pattern in the Earth's mantle is consistent with a late stage segregation of a small fraction of metal that consists of approximately 70% Ni at low degrees of partial melding of the silicates. This result is not consistent with the early Earth being substantially molten as the result of a giant impact to form the Moon. The results for the Moon show that the siderophile element pattern in the lunar mantle is consistent with the segregation of a small Ni-rich core at high degrees of melting of the silicates if some elements are initially depleted by some other process--presumably volatility during a giant impact. The high degree of partial melting of silicates is consistent with the postulated magma ocean on the Moon.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Dissertations, Academic.; Geochemistry.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Planetary Science; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Drake, Michael

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titlePartitioning behavior of moderately siderophile elements in Ni-rich systems: Implications for the earth and moon.en_US
dc.creatorHillgren, Valerie Jane.en_US
dc.contributor.authorHillgren, Valerie Jane.en_US
dc.date.issued1993en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractSeveral scenarios set forth to explain the siderophile element abundance patterns in the mantles of the Earth and the Moon involve the segregation of Ni-rich metal to the cores of those bodies under oxidizing conditions. To test these models, the partition coefficients of Ni, Co, Mo, W, P, and Ga between basaltic liquid, Ni-rich metal, and Ni-rich sulfide were experimentally determined under a wide range of oxygen fugacities. The partition coefficients are then used in mass balance calculations to test these scenarios involving oxidizing conditions during the formation of both the Earth's and the Moon's cores. The results show that the siderophile element pattern in the Earth's mantle is consistent with a late stage segregation of a small fraction of metal that consists of approximately 70% Ni at low degrees of partial melding of the silicates. This result is not consistent with the early Earth being substantially molten as the result of a giant impact to form the Moon. The results for the Moon show that the siderophile element pattern in the lunar mantle is consistent with the segregation of a small Ni-rich core at high degrees of melting of the silicates if some elements are initially depleted by some other process--presumably volatility during a giant impact. The high degree of partial melting of silicates is consistent with the postulated magma ocean on the Moon.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectDissertations, Academic.en_US
dc.subjectGeochemistry.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplinePlanetary Scienceen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairDrake, Michaelen_US
dc.contributor.committeememberPatchett, Jonathanen_US
dc.contributor.committeememberRuiz, Joaquinen_US
dc.contributor.committeememberLunine, Jonathanen_US
dc.contributor.committeememberMelosh, H. Jayen_US
dc.identifier.proquest9421782en_US
dc.identifier.oclc721986372en_US
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