| 38563 |
Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
| 38563 |
Creator |
96fdb8f74aad60e762b1aef18d80ab45 |
| 38563 |
Creator |
b75227dc49245aab76a534b836099ab7 |
| 38563 |
Creator |
d8b3b90e24f10b122cfbd5afecaaa40e |
| 38563 |
Creator |
f959096fc292f5182e8b214c797d2544 |
| 38563 |
Creator |
1b35f2160114480bb2a439ff7d486ae0 |
| 38563 |
Date |
2013 |
| 38563 |
Is Part Of |
p19455100 |
| 38563 |
Is Part Of |
repository |
| 38563 |
abstract |
Angrites are a small group of ancient basaltic achondrites, notable for their unusual
chemistry and extreme volatile depletion. No comprehensive study of indigenous light
elements currently exists for the group. Measurement of the abundances and isotopic
composition of carbon and nitrogen could provide information pertaining to the evolution
of the angrite parent body. Bulk-sample stepped combustion analyses of five angrites
and a glass separate from D'Orbigny were combined with earlier data and acid dissolution
experiments of carbonates found in D'Orbigny to compile an inventory of indigenous
carbon and nitrogen. Indigenous carbon combusted between 700 °C and 1200 °C, with
abundances of 10–140 ppm and a mass-weighted δ<sup>13</sup>C of −25 to −20‰ with the
exception of D'Orbigny (δ<sup>13</sup>C approximately −5‰). Nitrogen was released
at 850–1200 ºC, 1–20 ppm with a δ<sup>15</sup>N −3‰ to +4‰; again, D'Orbigny (δ<sup>15</sup>N
approximately +20 to +25‰) was an exception. We interpret these components as largely
indigenous and decoupled; the carbon in graphitic or amorphous form, while the nitrogen
is present as a dissolved component in the silicates. No relationship with the textural
sub-classification of angrites is apparent. We suggest that the angrite parent body
contains a reservoir of reduced carbon and thus may have undergone a change in redox
conditions, although the timing and mechanism for this remain unclear. |
| 38563 |
authorList |
authors |
| 38563 |
issue |
9 |
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status |
peerReviewed |
| 38563 |
volume |
48 |
| 38563 |
type |
AcademicArticle |
| 38563 |
type |
Article |
| 38563 |
label |
Abernethy, F. A. J. ; Verchovsky, A. B. ; Starkey, N. A. ; Anand, M. ; Franchi,
I. A. and Grady, M. M. (2013). Stable isotope analysis of carbon and nitrogen in
angrites. Meteoritics & Planetary Science, 48(9) pp. 1590–1606. |
| 38563 |
label |
Abernethy, F. A. J. ; Verchovsky, A. B. ; Starkey, N. A. ; Anand, M. ; Franchi, I.
A. and Grady, M. M. (2013). Stable isotope analysis of carbon and nitrogen in angrites.
Meteoritics & Planetary Science, 48(9) pp. 1590–1606. |
| 38563 |
Title |
Stable isotope analysis of carbon and nitrogen in angrites |
| 38563 |
in dataset |
oro |