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Creator |
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Creator |
ext-21d82adce2bb7a5e482730194c0b140e |
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Creator |
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Creator |
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Creator |
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Creator |
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Creator |
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Creator |
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Creator |
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Creator |
ext-838b68f2f36d4f4fa5af233a2fcc23ab |
| 72002 |
Creator |
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| 72002 |
Creator |
ext-899090b4bf47783a68417d390a59e2c7 |
| 72002 |
Creator |
ext-91047c3e99a962e89b86b417f64f192e |
| 72002 |
Creator |
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| 72002 |
Creator |
ext-9d96a655369df4fc4ec9e50afb02dcae |
| 72002 |
Creator |
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| 72002 |
Creator |
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| 72002 |
Creator |
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Creator |
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Creator |
ext-f7c636f72b7e1f582f4adfa1baa1483e |
| 72002 |
Date |
2020 |
| 72002 |
Is Part Of |
repository |
| 72002 |
Is Part Of |
p21699100 |
| 72002 |
abstract |
The <i>Curiosity</i> rover investigated a topographic structure known as Vera Rubin
ridge, associated with a hematite signature in orbital spectra. There, <i>Curiosity</i>
encountered mudstones interpreted as lacustrine deposits, conformably overlying the
300 m‐thick underlying sedimentary rocks of the Murray formation at the base of Mount
Sharp. While the presence of hematite (α‐Fe<sub>2</sub>O<sub>3</sub>) was confirmed
in‐situ by both Mastcam and ChemCam spectral observations and by the CheMin instrument,
neither ChemCam nor APXS observed any significant increase in FeO<sub>T</sub> (total
iron oxide) abundances compared to the rest of the Murray formation. Instead, <i>Curiosity</i>
discovered dark‐toned diagenetic features displaying anomalously high FeO<sub>T</sub>
abundances, commonly observed in association with light‐toned Ca‐sulfate veins but
also as crystal pseudomorphs in the host rock. These iron‐rich diagenetic features
are predominantly observed in “grey” outcrops on the upper part of the ridge, which
lack the telltale ferric signature of other Vera Rubin ridge outcrops. Their composition
is consistent with anhydrous Fe‐oxide, as the enrichment in iron is not associated
with enrichment in any other elements, nor with detections of volatiles. The lack
of ferric absorption features in the ChemCam reflectance spectra and the hexagonal
crystalline structure associated with dark‐toned crystals points toward coarse “grey”
hematite. In addition, the host rock adjacent to these features appears bleached and
show low‐FeO<sub>T</sub> content as well as depletion in Mn, indicating mobilization
of these redox‐sensitive elements during diagenesis. Thus, groundwater fluid circulations
could account for the remobilization of iron and recrystallization as crystalline
hematite during diagenesis on Vera Rubin ridge. |
| 72002 |
authorList |
authors |
| 72002 |
status |
published |
| 72002 |
status |
peerReviewed |
| 72002 |
uri |
http://data.open.ac.uk/oro/document/1213764 |
| 72002 |
uri |
http://data.open.ac.uk/oro/document/1213765 |
| 72002 |
uri |
http://data.open.ac.uk/oro/document/1213766 |
| 72002 |
uri |
http://data.open.ac.uk/oro/document/1213767 |
| 72002 |
uri |
http://data.open.ac.uk/oro/document/1213768 |
| 72002 |
uri |
http://data.open.ac.uk/oro/document/1213769 |
| 72002 |
uri |
http://data.open.ac.uk/oro/document/1213778 |
| 72002 |
type |
AcademicArticle |
| 72002 |
type |
Article |
| 72002 |
label |
L’Haridon, J.; Mangold, N.; Fraeman, A. A.; Johnson, J. R.; Cousin, A.; Rapin, W.;
David, G.; Dehouck, E.; Sun, V.; Frydenvang, J.; Gasnault, O.; Gasda, P.; Lanza, N.;
Forni, O.; Meslin, P.‐Y.; Schwenzer, S. P. ; Bridges, J.; Horgan, B.; House, C. H.;
Salvatore, M.; Maurice, S. and Wiens, R. C. (2020). Iron Mobility during Diagenesis
at Vera Rubin ridge, Gale Crater, Mars. Journal of Geophysical Research: Planets
(Early Access). |
| 72002 |
Publisher |
ext-851596484eb35d1cc26a8e8e11e207e8 |
| 72002 |
Title |
Iron Mobility during Diagenesis at Vera Rubin ridge, Gale Crater, Mars |
| 72002 |
in dataset |
oro |