We demonstrate nondestructive, three-dimensional, microscopic, infrared (IR) spectral in-situ imaging of an extraterrestrial sample. Spatially resolved chemical composition and spatial correlations are investigated within a single 45 µm grain of the Murchison meteorite. Qualitative and quantitative investigation through this analytical technique can help elucidate the origin and evolution of meteoritic compounds as well as parent body processes without damaging or altering the investigated samples.
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http://dx.doi.org/10.1177/0003702816671072 | DOI Listing |
Earth Planets Space
December 2024
School of Geographical and Earth Sciences, The University of Glasgow, Glasgow, G12 8RZ Scotland, UK.
Abstract: The effects of post-hydration heating over a broad range of temperatures are evident in many Mighei-like carbonaceous (CM) chondrites as a variety of mineral transitions. To better understand these processes and how a CM chondrite's starting composition may have affected them, we experimentally heated two meteorites with different degrees of aqueous alteration, Allan Hills 83100 and Murchison, at 25 °C temperature steps from 200 °C to 950 °C and 300 °C to 750 °C, respectively. During heating, synchrotron in situ X-ray diffraction patterns were collected.
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November 2024
Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK.
Cadmium isotope analyses are applied for research in planetary, Earth, environmental and life sciences. However, there is still a lack of efficient methods for the separation of the trace element Cd from the different types of samples that are of interest for isotopic analyses. This study presents new and improved Cd separation and purification techniques for meteorite, diverse terrestrial and seawater samples prior to Cd isotope measurements by multiple collector ICP-MS using the double spike approach for mass bias correction.
View Article and Find Full Text PDFNat Commun
May 2024
Department of Chemistry, University of Hawaii at Mānoa, Honolulu, HI, USA.
Science
December 2023
Geological and Planetary Science Division, California Institute of Technology, Pasadena, CA 91125, USA.
Astrobiology
October 2023
Center for Computational Sciences, University of Tsukuba, Tsukuba, Japan.
The enantiomeric excess (ee) of l-form amino acids found in the Murchison meteorite poses some issues about the cosmic origin of their chirality. Circular dichroism (CD) spectra of amino acids in the far-ultraviolet (FUV) at around 6.8 eV (182 nm) indicate that the circularly polarized light can induce ee through photochemical reactions.
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