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Compositional and spectroscopic investigation of three ungrouped carbonaceous chondrites

Yesiltas, Mehmet; Kebukawa, Yoko; Glotch, Timothy D.; Zolensky, Michael; Fries, Marc; Aysal, Namik; Tukel, Fatma S.


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    "creators": [
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        "affiliation": "Kirklareli Univ, Fac Aeronaut & Space Sci, TR-39100 Kirklareli, Turkey", 
        "name": "Yesiltas, Mehmet"
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      {
        "affiliation": "Yokohama Natl Univ, Fac Engn, Yokohama, Kanagawa 2408501, Japan", 
        "name": "Kebukawa, Yoko"
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      {
        "affiliation": "SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11790 USA", 
        "name": "Glotch, Timothy D."
      }, 
      {
        "affiliation": "Johnson Space Ctr, NASA, Astromat Res & Explorat Sci, Houston, TX 77058 USA", 
        "name": "Zolensky, Michael"
      }, 
      {
        "affiliation": "Johnson Space Ctr, NASA, Astromat Res & Explorat Sci, Houston, TX 77058 USA", 
        "name": "Fries, Marc"
      }, 
      {
        "affiliation": "Istanbul Univ Cerrahpasa, Dept Geol Engn, TR-34320 Istanbul, Turkey", 
        "name": "Aysal, Namik"
      }, 
      {
        "affiliation": "Istanbul Univ Cerrahpasa, Dept Geol Engn, TR-34320 Istanbul, Turkey", 
        "name": "Tukel, Fatma S."
      }
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    "description": "Ungrouped carbonaceous chondrites are not easily classified into one of the well-established groups due to compositional/petrological differences and geochemical anomalies. Type 2 ungrouped carbonaceous chondrites represent a very small fraction of all carbonaceous chondrites. They can potentially represent different aspects of asteroids and their regolith material. By conducting a multitechnique investigation, we show that Queen Alexandra Range (QUE) 99038 and Elephant Moraine (EET) 83226 do not resemble type 2 carbonaceous chondrites. QUE 99038 exhibits coarse-grained matrix, Fe-rich rims on olivines, and an apparent lack of tochilinite, suggesting that QUE 99038 has been metamorphosed. Its polyaromatic organic matter structures closely resemble oxidized CV3 chondrites. EET 83226 exhibits a clastic texture with high porosity and shows similarities to CO3 chondrites. It consists of numerous large chondrules with fine-grained rims that are often fragmented and discontinuous and set within matrix, suggesting a formation mechanism for the rims in a regolith environment. The kind of processes that can result in such chemical compositions as in QUE 99038 and EET 83226 is currently not fully known and clearly presents a conundrum. Tarda is a highly friable carbonaceous chondrite with close resemblance to Tagish Lake (ungrouped C2 chondrite). It comprises different types of chondrules (some with Fe-rich rims), framboid magnetite, sulfides, carbonates, and phyllosilicate- and carbon-rich matrix, and is consistent with being an ungrouped C2 chondrite.", 
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      "pages": "1665-1687", 
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    "title": "Compositional and spectroscopic investigation of three ungrouped carbonaceous chondrites"
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