DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Araneiform terrain formation in Angustus Labyrinthus, Mars

Hao, Jingyan and Michael, G. and Adeli, Solmaz and Jaumann, Ralf (2019) Araneiform terrain formation in Angustus Labyrinthus, Mars. Icarus, 317, pp. 479-490. Elsevier. doi: 10.1016/j.icarus.2018.07.026. ISSN 0019-1035.

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S0019103517303421


The south polar area of Mars exhibits an abundance of distinctive and exotic landforms, most of which occur within the region covered by the seasonal CO2 cap. Araneiform terrain (also referred to as terrain covered by “spiders”) is one of these unusual geomorphic features, resulting from CO2 sublimation driven seasonal erosion. The High Resolution Imaging Science Experiment (HiRISE) on board NASA's Mars Reconnaissance Orbiter (MRO) spacecraft has repeatedly imaged Angustus Labyrinthus, informally known as the Inca City region (81°S, 296°E), over a period of four Martian years, showing a variety of classic polar features associated with sublimation and deposition including spiders. We mapped the spiders´ spatial distribution in the Inca City region and classified them in view of their morphological and topographic characteristics into four types, fat, thin, half, and elongated spiders. The latter two are reported for the first time in this work. We find that the formation mechanisms of half and elongated spiders were substantially influenced by ridge boundaries topography and pre-existing linear depressions, respectively. Based on our observations, we extend the conceptual model of spider erosion, explaining new elements of the spider formation process. We interpret the causes of deviating araneiform species from thin spiders (i.e., half, elongated and fat spiders) in the context of the extended model. We consider the migration of pressurized CO2 through the porous substrate towards breaches in the ice cover, and the influence of the substrate's cohesive strength on the development of spider legs. Analysis of the spatial distribution of a fat spider population revealed that the initiation locations of spiders are not random but more evenly spaced, indicating the existence of an inhibited zone around a newly formed spider, consistent with our interpretations of the formation mechanism. Our case study in the Inca City region provides new understanding in the formation process of basal sublimation-driven features and thus offers new insight into polar surface processes.

Item URL in elib:https://elib.dlr.de/125178/
Document Type:Article
Title:Araneiform terrain formation in Angustus Labyrinthus, Mars
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Michael, G.Institute of Geosciences, Freie Universität Berlin, Berlin , GermanyUNSPECIFIEDUNSPECIFIED
Adeli, SolmazUNSPECIFIEDhttps://orcid.org/0000-0001-9972-409XUNSPECIFIED
Jaumann, RalfUNSPECIFIEDhttps://orcid.org/0000-0002-9759-6597UNSPECIFIED
Date:January 2019
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 479-490
Keywords:Mars, Polar caps Araneiform terrain Spiders Surface changes Sublimation Spatial randomness analysis Erosion Inca city Angustus labyrinthus HRSC HiRISE CTX
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project Mars Express HRSC (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Eckart, Lisa Maria
Deposited On:17 Dec 2018 08:52
Last Modified:06 Sep 2019 15:26

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.