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Papers by Minako Righter

Goldschmidt2022 abstracts, 2022

Introduction: Lunar meteorites potentially sample portions of the lunar surface that were not vis... more Introduction: Lunar meteorites potentially sample portions of the lunar surface that were not visited during the Apollo and Luna missions to the Moon and can provide new insights into the impact history of the Moon [1]. Miller Range (MIL) 13317 is a newly classified lunar anorthositic breccia that was collected during the 2013 ANSMET Expedition [2]. The meteorite is a single stone weighing 32.2g and is partially covered by fusion crust. The interior is a dark gray breccia with numerous clasts up to 1 cm in size [2]. Here we present an integrated petrologic and U-Pb geochronologic study of thin section MIL 13317,5. Analytical Methods: For each thin section an Xray element map was produced using a JEOL JXA8530F HyperProbe following the procedures of [3] but adapted to this machine (Fig. 1). BSE images of target locations were then generated using a JEOL 5910LV SEM to assess mineral assemblages. Quantitative analyses of minerals in the thin sections were conducted using a Cameca SX100 ...

Goldschmidt Abstracts, 2020

ABSTRACT This highly shocked ultramafic shergottite is the first such martian specimen with &... more ABSTRACT This highly shocked ultramafic shergottite is the first such martian specimen with "enriched" compositional characteristics.

U-Pb isotope systematics of phosphate from the Chelyabinsk meteorite indicate two periods of Pb l... more U-Pb isotope systematics of phosphate from the Chelyabinsk meteorite indicate two periods of Pb loss, one at 4456 ± 18 Ma and another at 559 ± 180 Ma.

ABSTRACT We have analyzed zircon and baddeleyite grains from polymict eucrites and howardites. Pr... more ABSTRACT We have analyzed zircon and baddeleyite grains from polymict eucrites and howardites. Preliminary results shows those ages are slightly younger than those of unbrecciated eucrites reported before.

Science, 2010

Less Old Martian Meteorite The oldest Martian meteorite known, ALH84001, was thought to be a remn... more Less Old Martian Meteorite The oldest Martian meteorite known, ALH84001, was thought to be a remnant of primordial martian crust formed during solidification of an early magma ocean. Using isotope data, Lapen et al. (p. 347 ) revised the crystallization age of this meteorite from 4.51 billion years to 4.09 billion years ago, meaning that this rock cannot be a fragment of primordial crust that escaped the period of intense bombardment that occurred between 4.25 and 4.10 billion years ago. The revised age also suggests that magmatism was ongoing in Mars for a large part of its history and that ALH84001 was actually formed during the heavy bombardment period, just before the martian core dynamo stopped and the planetary magnetic field was lost.

Geochimica et Cosmochimica Acta, 2010

Geological Society of America Abstracts with Programs

SEPARATE LAUNCH SITES ON MARS. A. J. Irving, S. M. Kuehner, T. J. Lapen, M. Righter, H. Busemann,... more SEPARATE LAUNCH SITES ON MARS. A. J. Irving, S. M. Kuehner, T. J. Lapen, M. Righter, H. Busemann, R. Wieler and K. Nishiizumi Dept. of Earth & Space Sciences, University of Washington, Seattle, WA (irvingaj@uw.edu), Dept. of Earth & Atmospheric Sciences, University of Houston, TX, Inst. für Geochemie & Petrologie, ETH Zürich, Switzerland, Space Sciences Laboratory, University of California, Berkeley, CA.

Goldschmidt2022 abstracts, 2022

Introduction: Lunar meteorites potentially sample portions of the lunar surface that were not vis... more Introduction: Lunar meteorites potentially sample portions of the lunar surface that were not visited during the Apollo and Luna missions to the Moon and can provide new insights into the impact history of the Moon [1]. Miller Range (MIL) 13317 is a newly classified lunar anorthositic breccia that was collected during the 2013 ANSMET Expedition [2]. The meteorite is a single stone weighing 32.2g and is partially covered by fusion crust. The interior is a dark gray breccia with numerous clasts up to 1 cm in size [2]. Here we present an integrated petrologic and U-Pb geochronologic study of thin section MIL 13317,5. Analytical Methods: For each thin section an Xray element map was produced using a JEOL JXA8530F HyperProbe following the procedures of [3] but adapted to this machine (Fig. 1). BSE images of target locations were then generated using a JEOL 5910LV SEM to assess mineral assemblages. Quantitative analyses of minerals in the thin sections were conducted using a Cameca SX100 ...

Goldschmidt Abstracts, 2020

ABSTRACT This highly shocked ultramafic shergottite is the first such martian specimen with &... more ABSTRACT This highly shocked ultramafic shergottite is the first such martian specimen with "enriched" compositional characteristics.

U-Pb isotope systematics of phosphate from the Chelyabinsk meteorite indicate two periods of Pb l... more U-Pb isotope systematics of phosphate from the Chelyabinsk meteorite indicate two periods of Pb loss, one at 4456 ± 18 Ma and another at 559 ± 180 Ma.

ABSTRACT We have analyzed zircon and baddeleyite grains from polymict eucrites and howardites. Pr... more ABSTRACT We have analyzed zircon and baddeleyite grains from polymict eucrites and howardites. Preliminary results shows those ages are slightly younger than those of unbrecciated eucrites reported before.

Science, 2010

Less Old Martian Meteorite The oldest Martian meteorite known, ALH84001, was thought to be a remn... more Less Old Martian Meteorite The oldest Martian meteorite known, ALH84001, was thought to be a remnant of primordial martian crust formed during solidification of an early magma ocean. Using isotope data, Lapen et al. (p. 347 ) revised the crystallization age of this meteorite from 4.51 billion years to 4.09 billion years ago, meaning that this rock cannot be a fragment of primordial crust that escaped the period of intense bombardment that occurred between 4.25 and 4.10 billion years ago. The revised age also suggests that magmatism was ongoing in Mars for a large part of its history and that ALH84001 was actually formed during the heavy bombardment period, just before the martian core dynamo stopped and the planetary magnetic field was lost.

Geochimica et Cosmochimica Acta, 2010

Geological Society of America Abstracts with Programs

SEPARATE LAUNCH SITES ON MARS. A. J. Irving, S. M. Kuehner, T. J. Lapen, M. Righter, H. Busemann,... more SEPARATE LAUNCH SITES ON MARS. A. J. Irving, S. M. Kuehner, T. J. Lapen, M. Righter, H. Busemann, R. Wieler and K. Nishiizumi Dept. of Earth & Space Sciences, University of Washington, Seattle, WA (irvingaj@uw.edu), Dept. of Earth & Atmospheric Sciences, University of Houston, TX, Inst. für Geochemie & Petrologie, ETH Zürich, Switzerland, Space Sciences Laboratory, University of California, Berkeley, CA.

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