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uri |
http://data.open.ac.uk/oro/document/999502 |
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http://data.open.ac.uk/oro/document/999503 |
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http://data.open.ac.uk/oro/document/999505 |
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http://data.open.ac.uk/oro/document/999506 |
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volume |
266 |
| 58830 |
type |
AcademicArticle |
| 58830 |
type |
Article |
| 58830 |
label |
Tartèse, Romain ; Anand, Mahesh and Franchi, Ian (2019). H and Cl isotope characteristics
of indigenous and late hydrothermal fluids on the differentiated asteroidal parent
body of Grave Nunataks 06128. Geochimica et Cosmochimica Acta (Early Access).
|
| 58830 |
label |
Tartèse, Romain ; Anand, Mahesh and Franchi, Ian (2019). H and Cl isotope characteristics
of indigenous and late hydrothermal fluids on the differentiated asteroidal parent
body of Grave Nunataks 06128. Geochimica et Cosmochimica Acta, 266 pp. 529–543. |
| 58830 |
Title |
H and Cl isotope characteristics of indigenous and late hydrothermal fluids on the
differentiated asteroidal parent body of Grave Nunataks 06128 |
| 58830 |
in dataset |
oro |
| 58830 |
Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
| 58830 |
Creator |
51ba1648465fe8c369f2825dd9ca5ad7 |
| 58830 |
Creator |
b75227dc49245aab76a534b836099ab7 |
| 58830 |
Date |
2019 |
| 58830 |
Date |
2019-12-01 |
| 58830 |
Is Part Of |
p00167037 |
| 58830 |
Is Part Of |
repository |
| 58830 |
abstract |
The paired achondrites Graves Nunataks (GRA) 06128 and 06129 are samples of an asteroid
that underwent partial melting within a few million years after the start of Solar
System formation. In order to better constrain the origin and processing of volatiles
in the early Solar System, we have investigated the abundance of H, F and Cl and the
isotopic composition of H and Cl in phosphates in GRA 06128 using secondary ion mass
spectrometry. Indigenous H in GRA 06128, as recorded in magmatic merrillite, is characterised
by an average δD of <i>ca</i>. -152 ± 330‰, which is broadly similar to estimates
of the H isotope composition of indigenous H in other differentiated asteroidal and
planetary bodies such as Mars, the Moon and the angrite and eucrite meteorite parent
bodies. The merrillite data thus suggest that early accretion of locally-derived volatiles
was widespread for the bodies currently populating the asteroid belt. Apatite formed
at the expense of merrillite around 100 million years after the differentiation of
the GRA 06128/9 parent body, during hydrothermal alteration, which was probably triggered
by an impact event. Apatite in GRA 06128 contains 5.4-5.7 wt.% Cl, 0.6-0.8 wt.% F,
and ~20 to 60 ppm H<sub>2</sub>O, which is similar to the H<sub>2</sub>O abundance
in merrillite from which apatite formed. The apatite δD values range between around
+100‰ and +2000‰ and are inversely correlated with apatite H<sub>2</sub>O contents.
The Cl isotope composition of apatite appears to be homogeneous across various grains,
with an average δ<sup>37</sup> Cl value of 3.2 ± 0.7‰. A possible scenario to account
for the apatite chemical and isotopic characteristics involves interaction of GRA
06128/9 with fumarole-like fluids derived from D- and HCl-rich ices delivered to
the GRA 06128/9 parent-body by an ice-rich impactor. |
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authorList |
authors |
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status |
peerReviewed |
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