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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 ...
Quantifying Iron-Redox Variations in Silicate Liquids Responsible for the Magmatic Oxygen Fugacity Diversity of Mars

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자료유형  
 학위논문 서양
최종처리일시  
20260202105255
ISBN  
9798263319816
DDC  
551
저자명  
Aithala, Sanath P.
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  
Magmatic oxygen fugacity
키워드  
Silicate liquids
키워드  
Martian igneous lithologies
키워드  
Martian magmas
키워드  
Mossbauer spectroscopy
기타저자  
University of Minnesota Earth Sciences
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■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.

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