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Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
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Creator |
51ba1648465fe8c369f2825dd9ca5ad7 |
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Creator |
b75227dc49245aab76a534b836099ab7 |
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Creator |
f062697d62dd5682983453387aa5167e |
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Creator |
ext-ecbe70c55cd3daa96faa692a4be55d43 |
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Date |
2014-10 |
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Is Part Of |
repository |
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Is Part Of |
p14a8468605df01783b2969e7fa2e7dfb |
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abstract |
Lunar apatite has been the main target for numerous recent investigations (as reviewed
in Anand et al., 2014, Phil. Trans. Royal Soc. A, in press) because of its widespread
occurrence in a variety of lunar rocks and its potential to reveal the volatile inventory
of the Moon. Of the three volatiles (F, Cl and OH) present in lunar apatites, it is
the abundance of OH and its H isotopic composition that have received most attention.
Previously, only Cl abundances could reliably be measured in lunar apatites using
an electron microprobe, while F measurements were associated with large uncertainties
and OH abundances were estimated by difference based on stoichiometry (e.g., McCubbin
et al., 2011, GCA,75, 5073-5093). Advancements in analytical instrumentation such
as the ion probe have facilitated more accurate and precise measurements of not only
abundances of OH, F and Cl but also measurements of H and Cl isotopic compositions
in lunar apatites. A number of groups worldwide are currently engaged in ion probe
measurements of volatiles in apatites from a variety of lunar rocks. Such concerted
efforts have yielded a wealth of new data highlighting a number of processes (e.g.,
degassing, spallation, fractional crystallisation etc.) that need to be taken into
consideration before the history of indigenous lunar volatiles can be fully comprehended.
We have measured OH-δD systematics of apatites in lunar rocks from the ancient highlands
terrain as well as the younger maria and various impact-related rock types. We have
also begun coupled analyses of H and Cl isotopes in individual apatite grains from
a variety of lunar samples to get further constraints on the effects of different
processes on abundance and isotopic composition of H and Cl.
Some of the major highlights from recent work carried our on lunar apatites has been
the revelation of complex partitioning behaviour of F, Cl and OH in apatite during
fractional crystallisation from a basaltic melt, significant effects of spallation
and degassing processes on the H and Cl isotopic composition, and an almost identical
source of water in the Earth-Moon system. The field of lunar apatite research is rapidly
evolving with acquisition of high-quality data necessitating paradigm changes and
revisions in established hypotheses and models for the origin and evolution of volatiles
in the Moon. |
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authorList |
authors |
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issue |
6 |
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presentedAt |
ext-a1c740e85396a157cbe9f3e09294bb3f |
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status |
nonPeerReviewed |
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volume |
46 |
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type |
AcademicArticle |
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type |
Article |
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label |
Anand, M. ; Tartèse, R. ; Barnes, J. J. ; Franchi, I. A. and Russell, S. S. (2014).
Apatite: a versatile recorder of the history of lunar volatiles. In: Geological
Society of America Abstracts with Programs, 46(6) p. 27. |
| 42540 |
label |
Anand, M. ; Tartèse, R. ; Barnes, J. J. ; Franchi, I. A. and Russell, S. S. (2014).
Apatite: a versatile recorder of the history of lunar volatiles. In: Geological
Society of America Abstracts with Programs, 46(6) p. 27. |
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Title |
Apatite: a versatile recorder of the history of lunar volatiles |
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in dataset |
oro |