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dc.contributor.authorZhang, Zhihai
dc.date.accessioned2016-07-05T17:49:58Z
dc.date.available2016-07-05T17:49:58Z
dc.identifier.urihttp://hdl.handle.net/10222/71921
dc.description.abstractDespite of numerous studies the compositions of C-O-H fluids in the mantle and kimberlites remain uncertain due to limitations of conventional methods. My study shows no correlation between internal properties in diamond outer rims and resorption morphologies, suggesting little effect of internal factors on resorption morphologies. Diamond dissolution experiments were conducted at 1-3 GPa and 1150 – 1400 oC in C-O-H fluids with XCO2 =0 -1, monitored in-situ by synthetic fluid inclusions. The experimental results show that 1) a miscibility gap exists in the CO2-H2O-dominated system at 1250 oC under 1 and 3 GPa, 2) circular pits form on tetrahexahedral faces in pure H2O at 1 GPa buffered by MgO-forsterite, and 3) the bulk composition of C-O-H fluids controls the pressure effects on diamond rounding rates and resorption morphologies. The combined empirical and experimental studies demonstrate diamond resorption morphology robustly semi-quantitatively recording compositions of the latest diamond-etching fluids.en_US
dc.language.isoenen_US
dc.subjectDiamondsen_US
dc.subjectatomic force microscopeen_US
dc.subjectmantle metasomatismen_US
dc.subjectKimberliteen_US
dc.subjectsynthetic fluid inclusionsen_US
dc.subjectetch pitsen_US
dc.subjectpiston cylinder apparatusen_US
dc.subjectC isotopesen_US
dc.subjectNitrogenen_US
dc.subjectCarbon - Isotopes
dc.titleDiamond resorption morphology as a fluid proxy in diamond-bearing environments: Constraints from empirical and experimental studiesen_US
dc.date.defence2016-03-30
dc.contributor.departmentDepartment of Earth Sciencesen_US
dc.contributor.degreeDoctor of Philosophyen_US
dc.contributor.external-examinerDr. Steven Shireyen_US
dc.contributor.graduate-coordinatorJohn Gosseen_US
dc.contributor.thesis-readerDr. James Brenanen_US
dc.contributor.thesis-readerDr. Jacob Hanleyen_US
dc.contributor.thesis-supervisorDr. Yana Fedortchouken_US
dc.contributor.ethics-approvalNot Applicableen_US
dc.contributor.manuscriptsNot Applicableen_US
dc.contributor.copyright-releaseYesen_US
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