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Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
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Creator |
b75227dc49245aab76a534b836099ab7 |
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Creator |
535569f047a5e8d3192793448a2322e2 |
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Creator |
43f40d698d97ce854ada94ac93e97900 |
| 72200 |
Creator |
ext-3abf1667ba75f64ab16333e0405d55de |
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Creator |
ext-8e6fb4c4b99033596e9070a67ad828aa |
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Creator |
ext-91c659533c8e2e9ba3c567bec8455b2a |
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Creator |
ext-92d47df93cc91c2c93a524d4a08842b3 |
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Creator |
ext-96f15a5f0819351df15d2334e77c690b |
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Creator |
ext-dd03e02520bb3995d5cad4ef84cf3131 |
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Date |
2020-09-15 |
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Is Part Of |
repository |
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Is Part Of |
p21699100 |
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abstract |
<b>Abstract</b><br></br>Apatite, a major hydrous mineral in martian meteorites, has
the potential to reveal history of volatiles on Mars. Here we report the H and Cl
isotopic systematics of apatite from the enriched basaltic shergottite NWA 8657 to
better understand the processes influencing volatiles at or near the martian (sub)surface.
The apatite in NWA 8657 has the highest reported δD value (up to 6509 ‰) of any phosphates
in martian meteorites. The positive correlation between the H<sub>2</sub>O contents
(72‐2251 ppm) and δD values (3965‐6509 ‰) as well as between the Cl contents (1.28‐6.17
wt%) and δ<sup>37</sup>Cl values (‐1.7‐4.0 ‰) in NWA 8657 apatite are consistent with
mixing between volatiles derived from the martian mantle and meteoric water/fluid.
The D‐ and <sup>37</sup>Cl‐enrichment of apatite in NWA 8657 implies isotopic exchange
with sub‐surficial fluids during post‐crystallization hydrothermal event(s). <br></br><br></br><b>Plain
Language Summary</b><br></br> Mars was probably a wet and warm world during its earliest
geological history, supported by many lines of evidence. Present‐day Mars is cold
and arid although recent remote sensing data support the existence of subsurface glaciers
and seasonal fluid activities at some locations. In this study, our aim was to use
ground truth about the potential water‐rock interaction on or near‐surface environments
on recent Mars via measuring the H and Cl isotopic compositions of apatite from a
geologically young meteorite from Mars; the enriched basaltic shergottite NWA 8657.
The petrography and mineral chemistry of apatite and other associated phases, e.g.,
merrillite, maskelynite, mesostasis, and pyroxene, were documented prior to <i>in
situ</i> H and Cl isotopes analysis. The water contents of apatite, merrillite, maskelynite,
mesostasis, and pyroxene are positively correlated with the δD values. All of the
datasets can be reconciled in terms of mixing between two endmembers, a D‐poor (~0
‰) mantle reservoir and a D‐rich (5920 ± 500 ‰) near‐surface/underground water reservoir.
Moreover, apatite in NWA 8657 displays <sup>37</sup>Cl‐enriched (~1 ± 1 ‰ in average)
characteristics. These signatures are consistent with D‐ and <sup>37</sup>Cl‐rich
fluid‐assisted isotopic exchange in recent near‐surface environment on Mars. |
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authorList |
authors |
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issue |
9 |
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status |
published |
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status |
peerReviewed |
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uri |
http://data.open.ac.uk/oro/document/1239258 |
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uri |
http://data.open.ac.uk/oro/document/1239263 |
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uri |
http://data.open.ac.uk/oro/document/1239264 |
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uri |
http://data.open.ac.uk/oro/document/1239265 |
| 72200 |
uri |
http://data.open.ac.uk/oro/document/1239266 |
| 72200 |
uri |
http://data.open.ac.uk/oro/document/1239267 |
| 72200 |
uri |
http://data.open.ac.uk/oro/document/1239916 |
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volume |
125 |
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type |
AcademicArticle |
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type |
Article |
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label |
Hu, S. ; Lin, Y.; Anand, M. ; Franchi, I. A. ; Zhao, X. ; Zhang, J.; Hao, J.; Zhang,
T.; Yang, W. and Changela, H. (2020). Deuterium and 37Chlorine Rich Fluids on the
Surface of Mars: Evidence from the Enriched Basaltic Shergottite Northwest Africa
8657. Journal of Geophysical Research: Planets, 125(9), article no. e2020JE006537. |
| 72200 |
Publisher |
ext-851596484eb35d1cc26a8e8e11e207e8 |
| 72200 |
Title |
Deuterium and <sup>37</sup>Chlorine Rich Fluids on the Surface of Mars: Evidence from
the Enriched Basaltic Shergottite Northwest Africa 8657 |
| 72200 |
in dataset |
oro |