Joshua F. Snape

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The Pb isotopic compositions of maskelynite and pyroxene grains were measured in ALH84001 and three enriched shergottites (Zagami, Roberts Massif 04262, and Larkman Nunatuk 12011) by secondary ion mass spectrometry. A maskelynite-pyroxene isochron for ALH84001 defines a crystallization age of 4089 ± 73Ma (2σ). The initial Pb isotopic composition of each(More)
a Department of Geosciences, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden b Department of Applied Geology, Curtin University, Perth, WA 6845, Australia c Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden d Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Muséum National d’Histoire(More)
The Pb isotope composition of a nuclear fallout debris particle has been directly measured in post-detonation materials produced during the Trinity nuclear test by a secondary ion mass spectrometry (SIMS) scanning ion image technique (SII). This technique permits the visual assessment of the spatial distribution of Pb and can be used to obtain full Pb(More)
Introduction: Lunar meteorite Northeast Africa 001 (NEA 001) is a feldspathic polymict regolith breccia [1,2,3]. The subsection studied for this investigation was subject to a detailed petrologic study outlined in [4], which included the acquisition of major element mineral and clast composition data. This study aims to build on these results by providing(More)
AITKEN BASIN. M. E. Ennis, A. L. Fagan, J. N. Pogue, S. Porter, J. F. Snape, and D. A. Kring Planetary Geoscience Institute and Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA mennis2@utk.edu; Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN, USA abacasto@nd.edu; Earth(More)
CRATER. A. L. Fagan, M. E. Ennis, J. N. Pogue, S. Porter, J. F. Snape, C. R. Neal, and D. A. Kring; Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN, USA abacasto@nd.edu; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA mennis2@utk.edu; Earth and Planetary Sciences(More)
CRATER. J. F. Snape, A. L. Fagan, M. E. Ennis, J. N. Pogue, S. Porter, C. R. Neal, and D. A. Kring; Department of Earth Sciences, University College London, UK j.snape@ucl.ac.uk; Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN, USA abacasto@nd.edu; Department of Earth and Planetary Sciences, University of(More)
18 Lunar mare basalts provide insights into the compositional diversity of the Moon’s interior. Basalt 19 fragments from the lunar regolith can potentially sample lava flows from regions of the Moon not 20 previously visited, thus, increasing our understanding of lunar geological evolution. As part of a study 21 of basaltic diversity at the Apollo 12(More)
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