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Creator |
96fdb8f74aad60e762b1aef18d80ab45 |
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Creator |
b75227dc49245aab76a534b836099ab7 |
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Creator |
970b917038a425943ae594e993a37e66 |
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Creator |
bb3c8474391a969db97b1b61f6957ab9 |
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Creator |
1b35f2160114480bb2a439ff7d486ae0 |
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Date |
2002-05 |
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Is Part Of |
p10869379 |
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Is Part Of |
repository |
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abstract |
We have studied the carbon and nitrogen stable isotope geochemistry of a small pristine
sample of the Tagish Lake carbonaceous chondrite by high resolution stepped combustion
mass spectrometry, and compared the results with data from the Orgueil (CI1), EET
83334 (CM1) and Murchison (CM2) chondrites. The small chip of Tagish Lake analysed
herein had a higher carbon abundance (5.81 wt%) than any other chondrite, and a nitrogen
content (~1220 ppm) between that of CI1 and CM2 chondrites. Owing to the heterogeneous
nature of the meteorite, the measured carbon abundance might be artificially high:
the carbon inventory and whole rock carbon isotopic composition (δ13C ~ +24.4 deg)
of the chip was dominated by 13C-enriched carbon from the decomposition of carbonates
(between 1.29 wt.% and 2.69 wt.%; δ13C ~ +67 deg and δ18O ~ +35 deg, in the proportions
~ 4:1 dolomite to calcite). In addition to carbonates, Tagish Lake contains organic
carbon (~ 2.6 wt.%, δ13C ~ -9 deg; 1033 ppm N, δ15N ~ +77 deg), a level intermediate
between CI and CM chondrites. Around 2% of the organic material is thermally labile
and solvent soluble. A further ~18% of the organic species are liberated by acid hydrolysis.
Tagish Lake also contains a complement of presolar grains. It has a higher nanodiamond
abundance (~ 3650 - 4330 ppm) than other carbonaceous chondrites, along with ~ 8 ppm
silicon carbide. Whilst carbon and nitrogen isotope geochemistry is not diagnostic,
the data are consistent with classification of Tagish Lake as a CI2 chondrite. |
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authorList |
authors |
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issue |
5 |
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status |
peerReviewed |
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volume |
37 |
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type |
AcademicArticle |
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type |
Article |
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label |
Grady, M.M. ; Verchovsky, A.B. ; Franchi, I.A. ; Wright, I.P. and Pillinger, C.T.
(2002). Light element geochemistry of the Tagish Lake CI2 chondrite: Comparison with
CI1 and CM2 meteorites. Meteoritics and Planetary Science, 37(5) pp. 713–735. |
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label |
Grady, M.M. ; Verchovsky, A.B. ; Franchi, I.A. ; Wright, I.P. and Pillinger, C.T.
(2002). Light element geochemistry of the Tagish Lake CI2 chondrite: Comparison with
CI1 and CM2 meteorites. Meteoritics and Planetary Science, 37(5) pp. 713–735.
|
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Title |
Light element geochemistry of the Tagish Lake CI2 chondrite: Comparison with CI1
and CM2 meteorites |
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in dataset |
oro |