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Creator |
287e4d2a77ccfd8b9293bf47de3430e4 |
| 52919 |
Creator |
bd12e480200a0e58504d6106bfed3c8a |
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Creator |
5d2d9c11948b605d69e074b5216edc9a |
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Creator |
ext-3997212ad17dd590a756bc8b091e0b82 |
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Creator |
ext-45fd5a8d95c8730fd0e901955f6a5d58 |
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Creator |
ext-84f0abe8c34e3b587fd833ccc360e8e8 |
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Creator |
ext-f8002b0b85160e520f8d3e71ff8c0cce |
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Date |
2017-12 |
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Is Part Of |
repository |
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abstract |
Gale crater’s geological record has two stratigraphic groups deposited in an early
Hesperian fluviolacustrine system[1, 2]. The Bradbury Group (sols 1-750) is dominated
by fluvial conglomerate and sandstone with lacustrine mudstone in Yellowknife Bay[1,2].
The Mt Sharp Group (Murray formation) is mainly well laminated lacustrine mudstone[2].
We have analysed NASA Curiosity rover ChemCam[3] observation point compositions for
targets up to sol 1482 that have hit in situ host rock lacking obvious diagenetic
features. ChemCam data are plotted on scatter and density contour plots for their
associated stratigraphic units to replicate whole rock composition[4]. Our results
show that coarse grained (>1 mm) targets are dominated by trachybasalt[5] and subalkaline
basalt[5] igneous endmembers. Sandstone (0.062 – 1 mm) targets indicate a mixture
of subalkaline basalt[5], trachybasalt[5] and potassic igneous[6] sources. Finally,
mudstone units are dominated by the subalkaline basalt[5] at Yellowknife Bay, and
a relatively silica-rich, subalkaline basalt endmember in most of the Murray formation[4],
with an even more silica-rich volcanic component at Marias Pass[7]. This demonstrates
that Gale crater sediments record a variety of igneous compositions, with subalkaline
basalts dominant, but also including lesser amounts of alkaline and silica oversaturated
igneous components.
References: [1] Grotzinger et al. (2014) doi:10.1126/science.1242777, [2] Grotzinger
et al. (2015) doi:10.1126/science.aac7575. [3] Wiens et al. (2012) doi:10.1007/s11214-012-9902-4.
[4] Bedford et al. (subm.) GCA. [5] Edwards et al., (2017) MAPS, doi:10.1111/maps.12953.
[6] Treiman et al. (2016) doi: 10.1002/2015JE004932. [7] Morris et al. (2016) doi:
10.1073/pnas.1607098113. |
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authorList |
authors |
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presentedAt |
ext-6407ce4fecc67249e6c35ab5bc067961 |
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status |
peerReviewed |
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uri |
http://data.open.ac.uk/oro/document/640086 |
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uri |
http://data.open.ac.uk/oro/document/640091 |
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type |
AcademicArticle |
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type |
Article |
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label |
Bedford, C.C. ; Bridges, J.C. ; Schwenzer, S.P. ; Wiens, R.C.; Rampe, E.B.; Frydenvang,
J. and Gasda, P.J. (2017). Igneous compositions preserved in Gale crater's geological
record. In: 1st British Planetary Science Congress, 3-5 Dec 2017, Glasgow. |
| 52919 |
label |
Bedford, C.C. ; Bridges, J.C. ; Schwenzer, S.P. ; Wiens, R.C.; Rampe, E.B.; Frydenvang,
J. and Gasda, P.J. (2017). Igneous compositions preserved in Gale crater's geological
record. In: 1st British Planetary Science Congress, 3-5 Dec 2017, Glasgow.
|
| 52919 |
Title |
Igneous compositions preserved in Gale crater's geological record |
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in dataset |
oro |