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• W1985636416 abstract "Research Article| March 01, 2001 Merweville:A new South African chondritic meteorite S.A.B. Laubscher; S.A.B. Laubscher Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa, e-mail: stephanl@geoscience.org.za; LDA@na.rau.ac.za *Present address: Council for Geoscience, Private Bag X112, Pretoria 0001, South Africa Search for other works by this author on: GSW Google Scholar L D. Ashwal; L D. Ashwal Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa, e-mail: stephanl@geoscience.org.za; LDA@na.rau.ac.za Search for other works by this author on: GSW Google Scholar M. Tredoux; M. Tredoux Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa, e-mail: mtd@mail.egs.uct.ac.za Search for other works by this author on: GSW Google Scholar M.E. Zolensky; M.E. Zolensky Earth Science and Solar System Exploration Division, NASA Johnson Space Center, Mail Code SN-2, Houston, TX 77058, USA, e-mail: michael.ezolenskyl@jsc.nasa.gov Search for other works by this author on: GSW Google Scholar J.C. Loock; J.C. Loock Department of Geology, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa, e-mail: loockjc@sci.uovs.ac.za; praekehe@sci.uovs.ac.za Search for other works by this author on: GSW Google Scholar H.E. Praekelt H.E. Praekelt Department of Geology, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa, e-mail: loockjc@sci.uovs.ac.za; praekehe@sci.uovs.ac.za Search for other works by this author on: GSW Google Scholar Author and Article Information S.A.B. Laubscher *Present address: Council for Geoscience, Private Bag X112, Pretoria 0001, South Africa Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa, e-mail: stephanl@geoscience.org.za; LDA@na.rau.ac.za L D. Ashwal Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa, e-mail: stephanl@geoscience.org.za; LDA@na.rau.ac.za M. Tredoux Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa, e-mail: mtd@mail.egs.uct.ac.za M.E. Zolensky Earth Science and Solar System Exploration Division, NASA Johnson Space Center, Mail Code SN-2, Houston, TX 77058, USA, e-mail: michael.ezolenskyl@jsc.nasa.gov J.C. Loock Department of Geology, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa, e-mail: loockjc@sci.uovs.ac.za; praekehe@sci.uovs.ac.za H.E. Praekelt Department of Geology, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa, e-mail: loockjc@sci.uovs.ac.za; praekehe@sci.uovs.ac.za Publisher: Geological Society of South Africa First Online: 07 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2001 Geological Society of South Africa South African Journal of Geology (2001) 104 (1): 69–76. https://doi.org/10.2113/104.1.69 Article history First Online: 07 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation S.A.B. Laubscher, L D. Ashwal, M. Tredoux, M.E. Zolensky, J.C. Loock, H.E. Praekelt; Merweville:A new South African chondritic meteorite. South African Journal of Geology 2001;; 104 (1): 69–76. doi: https://doi.org/10.2113/104.1.69 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySouth African Journal of Geology Search Advanced Search Abstract We report petrologic, petrographic and chemical data for a newly discovered meteorite specimen from South Africa. The 7.04 kg specimen was found in ca. 1977 on the farm Waterval 64, about 30 km from the town of Merweville (−375 km northeast of Cape Town). Our research group confirmed the identity of the stone as a meteorite in 1997, and obtained a ~1.5 kg portion for study and classification. Externally, the specimen shows a few regmaglypts and a reddish-brown, weathered fusion crust. The sawn internal surfaces show that terrestrial weathering effects, which render a dark brownish colour to the specimen, have penetrated up to 4 to 5 cm into the meteorite. The relatively unweathered interior is light orange-brown in colour. Petrographically, the specimen shows a dominantly recrystallised texture, with a few recognisable chondrules or chondrule fragments. Shock stage is estimated at S2, and weathering grade is W2. Microprobe analyses yield: olivine (Fa23.32 ±0.612, PMD = 0.52, n = 13), orthopyroxene (Fs20.59 ±0.54, n 15), kamacite (Ni = 6.48 ±0.24 wt.%, Co = 0.94 ±0.14 wt.%, n = 15), taenite (Ni = 28.9 ± 2.3 wt.%, Co = 0.29 ±0.08 wt.%, n = 3), troilite (Ni = 0.10 ±0.11 wt.%, n = 17) and chromite (Cr/(Cr+Al) = 0.860 ±0.003, n = 4). No recognisable feldspar or glass is present in our thin sections of Merweville The dominantly recrystallised but partial preservation of chondrules, apparent absence of glass, and the relative uniformity of olivine and pyroxene compositions are all consistent with classification of Merweville as petrologic type 5. Chemical and mineralogical data for the “unweathered” portion of the meteorite fall best within the L group. We conclude that Merweville is an L5 chondrite. This new specimen increases the inventory of known South African meteorites to a total of 48. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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