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Quantifying Iron-Redox Variations in Silicate Liquids Responsible for the Magmatic Oxygen Fugacity Diversity of Mars
Quantifying Iron-Redox Variations in Silicate Liquids Responsible for the Magmatic Oxygen Fugacity Diversity of Mars
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105255
- ISBN
- 9798263319816
- DDC
- 551
- 서명/저자
- Quantifying Iron-Redox Variations in Silicate Liquids Responsible for the Magmatic Oxygen Fugacity Diversity of Mars
- 발행사항
- [Sl] : University of Minnesota, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 124 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Hirschmann, Marc M.
- 학위논문주기
- Thesis (Ph.D.)--University of Minnesota, 2025.
- 초록/해제
- 요약This thesis explores how the wide range of oxygen fugacities recorded in martian igneous lithologies were generated by placing quantitative constraints on the iron-redox systematics of martian magmas. Superliquidus experiments on silicate mixtures matching those of martian magmas were leveraged to quantify how oxygen fugacity (fO2) variations are related to changes in magmatic Fe3+/FeT ratio. The experiments presented here were conducted in vertical gas-mixing furnace, aerodynamic-laser-levitation furnace, and ½ in. piston cylinder apparatuses at temperatures ranging from 1250-2100 °C, pressures ranging from 100 kPa-3 GPa, and fO2s ranging from 4.54 logfO2 units below to 7.16 logfO2 units above the quartz-fayalite-magnetite redox buffer (QFM-4.54 to QFM+7.16). The Fe3+/FeT ratio of all glasses were measured using a combination of Mossbauer spectroscopy, colorimetric wet chemistry, and Fe K-edge X-ray absorption near-edge structure (XANES) spectroscopy (standardized by measurements of glass with Fe3+/FeT determined by Mossbauer spectroscopy). These measurements were combined with those from comparable studies on martian magma compositions. From these experiments, stepwise regression was used to construct models relating Fe3+/FeT to fO2, temperature, pressure, and composition to then apply for calculating the mass transfer required to generate fO2 variations observed from oxybarometry of shergottites, fO2 variations that occur from temperature variations during cooling, and fO2 variations that occur during magmatic decompression. In addition, the agreement between silicate glass Fe3+/FeT determined by Mossbauer spectroscopy and colorimetric wet chemistry techniques was validated, addressing a longstanding discussion comparing the techniques' precision and accuracy. In addition, an experimental design for investigating the temperature-dependent redox behaviors of silicate liquids over a range 850 °C, combining vertical gas-mixing furnace experiments with aerodynamic-laser-levitation furnace experiments, is presented for the first time.
- 일반주제명
- Geology
- 일반주제명
- Geochemistry
- 일반주제명
- Petrology
- 키워드
- Silicate liquids
- 키워드
- Martian magmas
- 기타저자
- University of Minnesota Earth Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105255
■006m o d
■007cr#unu||||||||
■020 ▼a9798263319816
■035 ▼a(MiAaPQ)AAI32278431
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551
■1001 ▼aAithala, Sanath P.
■24510▼aQuantifying Iron-Redox Variations in Silicate Liquids Responsible for the Magmatic Oxygen Fugacity Diversity of Mars
■260 ▼a[Sl]▼bUniversity of Minnesota▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a124 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Hirschmann, Marc M.
■5021 ▼aThesis (Ph.D.)--University of Minnesota, 2025.
■520 ▼aThis thesis explores how the wide range of oxygen fugacities recorded in martian igneous lithologies were generated by placing quantitative constraints on the iron-redox systematics of martian magmas. Superliquidus experiments on silicate mixtures matching those of martian magmas were leveraged to quantify how oxygen fugacity (fO2) variations are related to changes in magmatic Fe3+/FeT ratio. The experiments presented here were conducted in vertical gas-mixing furnace, aerodynamic-laser-levitation furnace, and ½ in. piston cylinder apparatuses at temperatures ranging from 1250-2100 °C, pressures ranging from 100 kPa-3 GPa, and fO2s ranging from 4.54 logfO2 units below to 7.16 logfO2 units above the quartz-fayalite-magnetite redox buffer (QFM-4.54 to QFM+7.16). The Fe3+/FeT ratio of all glasses were measured using a combination of Mossbauer spectroscopy, colorimetric wet chemistry, and Fe K-edge X-ray absorption near-edge structure (XANES) spectroscopy (standardized by measurements of glass with Fe3+/FeT determined by Mossbauer spectroscopy). These measurements were combined with those from comparable studies on martian magma compositions. From these experiments, stepwise regression was used to construct models relating Fe3+/FeT to fO2, temperature, pressure, and composition to then apply for calculating the mass transfer required to generate fO2 variations observed from oxybarometry of shergottites, fO2 variations that occur from temperature variations during cooling, and fO2 variations that occur during magmatic decompression. In addition, the agreement between silicate glass Fe3+/FeT determined by Mossbauer spectroscopy and colorimetric wet chemistry techniques was validated, addressing a longstanding discussion comparing the techniques' precision and accuracy. In addition, an experimental design for investigating the temperature-dependent redox behaviors of silicate liquids over a range 850 °C, combining vertical gas-mixing furnace experiments with aerodynamic-laser-levitation furnace experiments, is presented for the first time.
■590 ▼aSchool code: 0130.
■650 4▼aGeology
■650 4▼aGeochemistry
■650 4▼aPetrology
■653 ▼aMagmatic oxygen fugacity
■653 ▼aSilicate liquids
■653 ▼aMartian igneous lithologies
■653 ▼aMartian magmas
■653 ▼aMossbauer spectroscopy
■690 ▼a0372
■690 ▼a0996
■690 ▼a0584
■71020▼aUniversity of Minnesota▼bEarth Sciences.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0130
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360041▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


