Coordinated neutron and X-ray computed tomography of meteorites: Detection and distribution of hydrogen-bearing materials

Treiman, Allan H.; LaManna, Jacob M.; Hussey, Daniel S.; deClue, Isabella; Anovitz, Lawrence M.

doi:10.1111/maps.13904

Title: Coordinated neutron and X-ray computed tomography of meteorites: Detection and distribution of hydrogen-bearing materials

Journal Article · Mon Aug 29 00:00:00 EDT 2022 · Meteoritics and Planetary Science

DOI:https://doi.org/10.1111/maps.13904· OSTI ID:1892394

^[1];

^[2];

^[2]; deClue, Isabella ^[3];

^[4]

Universities Space Research Association, Houston, TX (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of Chicago, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division

Abstract The presence and distribution of hydrogen‐bearing materials in meteorites are important constraints on processes in the early solar system, and the delivery of volatile constituents to growing planets. Here, we show that coordinated neutron and X‐ray computed tomography, NXCT, can reveal the presence and distributions of hydrogen‐bearing materials in meteorites, and thus help constrain the presence and actions of water in the early solar system. NXCT is nearly nondestructive of meteorite samples. Neutron fluence in NXCT is approximately seven orders of magnitude less than in typical instrumental neutron activation analysis, and so produces little residual radioactivity and currently undetectable changes in isotope ratios. Heating during NXCT is minimal, but NXCT will overprint the record of cosmic ray exposure held in natural thermoluminescence. Two meteorites were examined. EET 87503 is a howardite, a regolith breccia inferred to be from the asteroid 4 Vesta, and contains fragments of eucrite basalt, diogenite pyroxenite, and H‐rich carbonaceous chondrites. With NXCT, the chondrite fragments within the meteorite piece can be clearly located and characterized, in preparation for possible extraction and detailed analyses. Graves Nunataks (GRA) 06100 is a CR2 chondrite meteorite that contains abundant iron metal and H‐bearing silicates from aqueous alteration. In NXCT, H‐bearing altered material is clearly distinguished from metal, and its distribution in three dimensions is revealed as a constraint on the processes of alteration.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Universities Space Research Association; US Department of Commerce; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1892394

Alternate ID(s):: OSTI ID: 1891157

Journal Information:: Meteoritics and Planetary Science, Vol. 57, Issue 10; ISSN 1086-9379

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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NIST NeXT: a system for truly simultaneous neutron and X-ray tomography LaManna, Jacob M.; Hussey, Daniel S.; DiStefano, Victoria H. Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXII https://doi.org/10.1117/12.2569666	conference	September 2020
Investigation of the H7 ordinary chondrite, Watson 012: Implications for recognition and classification of Type 7 meteorites Tait, Alastair W.; Tomkins, Andrew G.; Godel, Bélinda M. Geochimica et Cosmochimica Acta, Vol. 134 https://doi.org/10.1016/j.gca.2014.02.039	journal	June 2014
Petrology of Martian meteorite Northwest Africa 998 Treiman, Allan H.; Irving, Anthony J. Meteoritics & Planetary Science, Vol. 43, Issue 5 https://doi.org/10.1111/j.1945-5100.2008.tb01085.x	journal	May 2008
Shock-induced mobilization of metal and sulfide in planetesimals: Evidence from the Buck Mountains 005 (L6 S4) dike-bearing chondrite Ruzicka, Alex; Brown, Ryan; Friedrich, Jon American Mineralogist, Vol. 100, Issue 11-12 https://doi.org/10.2138/am-2015-5225	journal	November 2015
The natural thermoluminescence of meteorites VI: Carbon-14, thermoluminescence and the terrestrial ages of meteorites Benoit, P. H.; Jull, A. J. T.; McKeever, S. W. S. Meteoritics, Vol. 28, Issue 2 https://doi.org/10.1111/j.1945-5100.1993.tb00757.x	journal	June 1993

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