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Cr ANOMALIES IN THE TAGISH LAKE AND ORGUEIL CARBONACEOUS CHONDRITES
| Content Provider | Semantic Scholar |
|---|---|
| Author | Birck, J.-L. Petitat, Manuel Gounelle, Matthieu |
| Copyright Year | 2009 |
| Abstract | Introduction: Early solar materials bear a variety of isotopic anomalies that reflect compositional differences deriving from distinct stellar nucleosynthetic processes. As shown in previous studies [i.e. 1,2,3], the stepwise dissolution with increasing acid strengths of bulk rock carbonaceous chondrites liberates Cr with both excesses and deficits in Cr and Cr. The magnitude of the Cr variations decreases in the sequence CI>CR>CM>CV>CO>CK and correlates with the degree of metamorphism of each carbonaceous chondrite class [3]. The Orgueil CI chondrite presents the highest Cr anomalies ever measured in major mineral fractions, consistent with this meteorite being chemically the most pristine [4]. The Tagish Lake meteorite is classified as an anomalous CI2 chondrite [5] and presents H [6], O [7] and C [8] isotopic compositions intermediate between CI and CM2 carbonaceous chondrites. Tagish Lake may have originated from a D-type asteroid or cometary parent body, coming from beyond the asteroid belt and harbouring the most pristine matter than any other known meteorite [9,10]. The goal of this study is to extend the survey of meteorites exhibiting Cr anomalies to Tagish Lake. A sample of Orgueil has been measured in parallel for comparison with earlier studies. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.lpi.usra.edu/meetings/lpsc2009/pdf/1683.pdf |
| Alternate Webpage(s) | http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1683.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
