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New Insights Into the Petrogenesis of Lunar Meteorite Allan Hills 81005 (ALHA81005)

Brum, Jared Thomas

Abstract Details

2022, Master of Science, Miami University, Geology and Environmental Earth Science.
Observations of Allan Hills 81005 via PLM and SEM-EDS are consistent with the classification of anorthositic regolith breccia. Clasts of anorthosite, basalt, granulite, and impact melt breccia are present. The brecciated matrix is dominated by plagioclase, minor (clino)pyroxene, and rarer olivine in addition to trace oxides and sulfides. Phosphates, spinels, glass spherules, and crystalline spherules are rare and not ubiquitous in studied sections. In section -92, a spinel-bearing dunite clast is present alongside several pink spinel-bearing troctolitic clasts. The composition of dunitic olivines is consistent with the lunar Mg-suite as exemplified by Mg#, CaO, Cr, and Mn systematics. Compositions also overlap with those from dunite sample 72417. Both are distinct from non Mg-suite dunites in 74275 and the modeled composition of early-formed LMO cumulates. Spinels within the dunite clast are also consistent with spinels within Mg-suite dunites (Mg# ~50, Cr# ~70) while troctolitic pink are consistent with Mg-suite spinel troctolites (Mg# ~70-80, Cr# <10). Collectively, the clast and mineral assemblages support an origin of ALHA81005 from the lunar highlands. The observation of a lunar dunite contributes to our understanding of Mg-suite magmatism during lunar differentiation.
Dr. Claire McLeod (Advisor)
Dr. Mark Krekeler (Committee Member)
Dr. John Rakovan (Committee Member)
72 p.

Recommended Citations

Citations

  • Brum, J. T. (2022). New Insights Into the Petrogenesis of Lunar Meteorite Allan Hills 81005 (ALHA81005) [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami165062830881624

    APA Style (7th edition)

  • Brum, Jared. New Insights Into the Petrogenesis of Lunar Meteorite Allan Hills 81005 (ALHA81005). 2022. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami165062830881624.

    MLA Style (8th edition)

  • Brum, Jared. "New Insights Into the Petrogenesis of Lunar Meteorite Allan Hills 81005 (ALHA81005)." Master's thesis, Miami University, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=miami165062830881624

    Chicago Manual of Style (17th edition)