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Phyllosilicate and hydrated silica detections in the knobby terrains of Acidalia Planitia, northern plains, Mars

Pan, L. and Ehlmann, B. L. (2014) Phyllosilicate and hydrated silica detections in the knobby terrains of Acidalia Planitia, northern plains, Mars. Geophysical Research Letters, 41 (6). pp. 1890-1898. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20141218-113056499

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Abstract

Here we report detections of Fe/Mg phyllosilicates and hydrated silica in discrete stratigraphic units within the knobby terrains of Acidalia Planitia made using data acquired by Compact Reconnaissance Imaging Spectrometer for Mars. Fe/Mg phyllosilicates are detected in knobs that were eroded during southward retreat of the dichotomy boundary. A second later unit, now eroded to steep-sided platforms embaying the knobs, contains hydrated silica, which may have formed via localized vapor weathering, thin-film leaching, or transient water that resulted in surface alteration. These are then overlain by smooth plains with small cones, hypothesized to be mud volcanoes which previous studies have shown to have no hydrated minerals. In spite of Acidalia's location within the putative northern ocean, collectively, the data record a history of aqueous processes much like that in the southern highlands with progressively less intensive aqueous chemical alteration from the Noachian to Amazonian.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2014GL059423DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2014GL059423/abstractPublisherArticle
ORCID:
AuthorORCID
Pan, L.0000-0002-8151-2125
Ehlmann, B. L.0000-0002-2745-3240
Additional Information:© 2014 American Geophysical Union. Received 26 JAN 2014; Accepted 28 FEB 2014; Accepted article online 4 MAR 2014; Published online 26 MAR 2014. Thanks to Jim Skinner for early discussions about northern plains evolution, Ara Oshagan for CTX mosaic and DEM processing, the MRO science operation teams for collecting the data set and the constructive comments of Nancy McKeown and one anonymous reviewer, which improved this manuscript. This work was supported by NASA Mars Data Analysis Program award NNX12AJ43G. The Editor thanks Nancy McKeown and an anonymous reviewer for their assistance in evaluating this paper.
Funders:
Funding AgencyGrant Number
NASANNX12AJ43G
Subject Keywords:Mars mineralogy; phyllosilicates; hydrated silica; Northern Plains
Issue or Number:6
Record Number:CaltechAUTHORS:20141218-113056499
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141218-113056499
Official Citation:Pan, L., and B. L. Ehlmann (2014), Phyllosilicate and hydrated silica detections in the knobby terrains of Acidalia Planitia, northern plains, Mars, Geophys. Res. Lett., 41, 1890–1898, doi:10.1002/2014GL059423
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53021
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Dec 2014 19:36
Last Modified:09 Mar 2020 13:19

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