Comparative Raman microscopy of a Martian meteorite and Antarctic lithic analogues |
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| Institution: | 1. Chemical and Forensic Sciences, University of Bradford, Bradford, BD7 1DP, UK;2. Meteorite Section, Natural History Museum, Cromwell Road, South Kensington, London, SWY 5BD, UK;3. British Antarctic Survey, High Cross, Madingley Rd., Cambridge, CB32 0ET, UK;4. Planetary Sciences Research Institute, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK;1. Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;2. Department of Physics, Karpagam University, Eachanari, Coimbatore, Tamil Nadu, India;3. Christhu Jyothi Public School, Rajakkad, Idukki, Kerala, India;4. King Abdullah Institute for Nanotechnology (KAIN), King Saud University, Riyadh 11451, Saudi Arabia;5. Department of Physics, TKM College of Arts and Science, Kollam, Kerala, India;6. Department of Chemistry, University of Antwerp, B2610 Antwerp, Belgium;1. Centre for Ion Beam Applications, Department of Physics, National University of Singapore, Singapore 117542, Singapore;2. Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore;3. Physikalisches Institut, Georg-August-Universität Göttingen, 37077, Germany;1. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia;2. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil;3. Geology Department, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil;1. Dipartimento di Matematica e Geoscienze, University of Trieste, Via Weiss 8, I-34127 Trieste, Italy;2. Dipartimento di Scienze Pure e Applicate, University of Urbino, Campus Scientifico “Enrico Mattei”, Via Cà Le Suore 2-4, 61029 Urbino, Italy;3. Instituto de Geociências, University of São Paulo, Cidade Universitária, Rua do Lago 562, 05508-080 São Paulo, Brazil;1. Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA;2. Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, ROC;3. CARMA, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | The Raman microspectra of the Nakhla SNC meteorite, which probably originates from Mars, are reported here for the first time. The specimen is shown to be heterogeneous, even at a sampling level of 2 μm, but several important mineralogical features have been identified, including clinopyroxene, olivine and plagioclase. In some sampling regions, α-quartz particles are evident and in one sample region the ν(CO2−3) mode of calcite at 1086 cm−1 is found. There is no evidence for organic chemical content detectable in this meteorite specimen, based on an absence of ν(CH) and δ(CH2) modes near 3000 and 1400 cm−1, respectively. Comparative Raman spectroscopic analyses were made on epilithic examples of Xanthoria elegans from Crater Cirque, northern Victoria Land, Antarctica, and cryptoendoliths from East Beacon, McMurdo Dry Valleys, as positive controls for microbial organics in cold, arid habitats analogous to former Martian conditions. Finally, an assessment is made of the potential role of Raman spectroscopy for extra-terrestrial characterisation of geological specimens. |
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