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The sedimentary rock record of Mars as viewed from the last decade of orbital missions

Le Deit, L. and Mangold, N. and Hauber, Ernst (2017) The sedimentary rock record of Mars as viewed from the last decade of orbital missions. International Meeting of Sedimentology 2017, 10-12 October, 2017, Toulouse, Frankreich.

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Official URL: https://ims2017.sciencesconf.org/data/IMS_2017_Abstracts_book.pdf


Over the last decade, orbital and landed missions have revealed a diverse and extensive sedimentary rock record on Mars. In the absence of plate tectonics, and because of a decline of the geological activity over time, the Martian sedimentary record is well-preserved and much older than terrestrial records. Both clastic and chemical sedimentary rocks occur on Mars, in a wide range of depositional environments. In addition to the expected impact-and volcanically-generated deposits, some sedimentary rocks were formed and deposited in local aqueous environments, i.e., alluvial, fluvial, deltaic, and lacustrine environments. Interestingly, clays are the most common and widespread alteration minerals on Mars. They have been detected by orbital visible and near-infrared spectroscopy in association with sedimentary rocks, supporting intense past chemical weathering under circum-neutral pH conditions. Therefore, more clement conditions have likely prevailed during the first billion years on Mars. Some regionally extensive sedimentary formations with thicknesses of up to several kilometers cover plateaus and fill canyons and other closed basins in the equatorial regions of Mars. Containing a variety of sulfates, iron oxides, amorphous silica, sometimes interbedded with clays, their origin is still under debate but likely results from multiple formation processes including lacustrine evaporation, groundwater alteration, hydrothermalism, and eolian reworking. Numerous exposures of chloride-bearing deposits show the existence of ancient ponding of brines. The mid-latitudes regions of Mars show a variety of ice-related deposits including lobate debris aprons, lineated valley fill and concentric crater fill. Sulfate-bearing sands in the polar regions are inferred to have formed by weathering of dust particles within ancient massive ice deposits. This presentation will provide an overview of those sedimentary formations as seen from orbital observations, and will discuss the implications on the geologic and climatic evolution of Mars.

Item URL in elib:https://elib.dlr.de/116453/
Document Type:Conference or Workshop Item (Poster)
Title:The sedimentary rock record of Mars as viewed from the last decade of orbital missions
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Le Deit, L.université de nantes, laboratoire de planétologie et géodynamiqueUNSPECIFIED
Mangold, N.lpgn, cnrs, université nantes, franceUNSPECIFIED
Hauber, Ernsternst.hauber (at) dlr.dehttps://orcid.org/0000-0002-1375-304X
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:e
Keywords:Mars, sedimentation, layering
Event Title:International Meeting of Sedimentology 2017
Event Location:Toulouse, Frankreich
Event Type:international Conference
Event Dates:10-12 October, 2017
Organizer:International Association of Sedimentologists
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project MARS-EXPRESS / HRSC
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Hauber, Ernst
Deposited On:01 Dec 2017 08:35
Last Modified:01 Dec 2017 08:36

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