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The geological history of Nili Patera, Mars

Fawdon, P.; Skok, J. R.; Balme, M. R.; Vye-Brown, C. L.; Rothery, D. A. and Jordan, C. J. (2015). The geological history of Nili Patera, Mars. Journal of Geophysical Research: Planets, 120(5) pp. 951–977.

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Nili Patera is a 50 km diameter caldera at the center of the Syrtis Major Planum volcanic province. The caldera is unique among Martian volcanic terrains in hosting: (i) evidence of both effusive and explosive volcanism, (ii) hydrothermal silica, and (iii) compositional diversity from olivine-rich basalts to silica-enriched units. We have produced a new geological map using three mosaicked 18 m/pixel Context Camera digital elevation models, supplemented by Compact Remote Imaging Spectrometer for Mars Hyperspectral data. The map contextualizes these discoveries, formulating a stratigraphy in which Nili Patera formed by trapdoor collapse into a volcanotectonic depression. The distinctive bright floor of Nili Patera formed either as part of a felsic pluton, exposed during caldera formation, or as remnants of welded ignimbrite(s) associated with caldera formation—both scenarios deriving from melting in the Noachian highland basement. After caldera collapse, there were five magmatic episodes: (1) a basaltic unit in the caldera's north, (2) a silica-enriched unit and the associated Nili Tholus cone, (3) an intrusive event, forming a ~300 m high elliptical dome; (4) an extrusive basaltic unit, emplaced from small cones in the east; and (5) an extreme olivine-bearing unit, formed on the western caldera ring fault. The mapping, together with evidence for hydrated materials, implies magmatic interaction with subsurface volatiles. This, in an area of elevated geothermal gradient, presents a possible habitable environment (sampled by the hydrothermal deposits). Additionally, similarities to other highland volcanoes imply similar mechanisms and thus astrobiological potential within those edifices.

Item Type: Journal Item
Copyright Holders: 2015 The Authors
ISSN: 2169-9100
Project Funding Details:
Funded Project NameProject IDFunding Body
Doctoral training grantNot SetSTFC (Science and Technology Facilities Council)
StudentshipNot SetBGS University Funding Initiative (BUFI)
Not SetNot SetUK Space Agency
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 44314
Depositing User: Matthew Balme
Date Deposited: 10 Sep 2015 15:27
Last Modified: 13 May 2019 17:58
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