| 44309 |
Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
| 44309 |
Creator |
51ba1648465fe8c369f2825dd9ca5ad7 |
| 44309 |
Creator |
b75227dc49245aab76a534b836099ab7 |
| 44309 |
Creator |
ext-8447d555db7f6f2e78078ed7d1f34db5 |
| 44309 |
Date |
2014-12-01 |
| 44309 |
Is Part Of |
p19455100 |
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Is Part Of |
repository |
| 44309 |
abstract |
We have investigated the H and Cl systematics in apatite from four brecciated lunar
meteorites. In Northwest Africa (NWA) 4472, most of the apatites contain ∼2000–6000
ppm H<sub>2</sub>O with δD between −200 and 0‰, except for one grain isolated in the
matrix, which contains ∼6000 ppm H<sub>2</sub>O with δD of ∼500–900‰. This low-δD
apatite contains ∼2500–7500 ppm Cl associated with δ<sup>37 </sup>Cl of ∼15–20‰, while
the high-δD grain contains ∼2500 ppm Cl with δ<sup>37 </sup>Cl of ∼7–15‰. In NWA 773,
apatites in a first group contain ∼700–2500 ppm H<sub>2</sub>O with δD values averaging
around ∼0 ± 100‰, while apatites in a second group contain ∼5500–16500 ppm H<sub>2
</sub>O with δD ∼250 ± 50‰. In Sayh al Uhaymir (SaU) 169 and Kalahari (Kal) 009, apatites
are similar in terms of their H<sub>2</sub>O contents (∼600–3000 ppm) and δD values
(−100 to 200‰). In SaU 169, apatites contain ∼6000–10,000 ppm Cl, characterized by
δ<sup>37 </sup>Cl of ∼5–12‰. Overall, most of the analyzed apatite grains have δD
within the range reported for carbonaceous chondrites, similar to apatite analyzed
in ancient (>3.9 Ga) lunar magmatic. One grain in NWA 4472 has H and Cl isotope compositions
similar to apatite from mare basalts. With an age of 4.35 Ga, this grain could be
a representative of the oldest known lunar volcanic activity. Finally, since numerous
evolved clasts in NWA 773 formed through silicate liquid immiscibility, the apatite
grains with extremely high H<sub>2 </sub>O contents, reaching pure hydroxylapatite
composition, could provide insights into the effects of such process on the evolution
of volatiles in lunar magmas. |
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authorList |
authors |
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issue |
12 |
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status |
peerReviewed |
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volume |
49 |
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type |
AcademicArticle |
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type |
Article |
| 44309 |
label |
Tartèse, Romain ; Anand, Mahesh ; Joy, Katherine H. and Franchi, Ian A. (2014).
H and Cl isotope systematics of apatite in brecciated lunar meteorites Northwest Africa
4472, Northwest Africa 773, Sayh al Uhaymir 169, and Kalahari 009. Meteoritics &
Planetary Science, 49(12) pp. 2266–2289. |
| 44309 |
label |
Tartèse, Romain ; Anand, Mahesh ; Joy, Katherine H. and Franchi, Ian A. (2014).
H and Cl isotope systematics of apatite in brecciated lunar meteorites Northwest Africa
4472, Northwest Africa 773, Sayh al Uhaymir 169, and Kalahari 009. Meteoritics &
Planetary Science, 49(12) pp. 2266–2289. |
| 44309 |
Title |
H and Cl isotope systematics of apatite in brecciated lunar meteorites Northwest Africa
4472, Northwest Africa 773, Sayh al Uhaymir 169, and Kalahari 009 |
| 44309 |
in dataset |
oro |