Ice-Ridge Pile Up and the Genesis of Martian "Shorelines"
Unique geomorphologic features such as basin terraces exhibiting topographic continuity have been found within several Martian craters as shown in Viking, MOC, and THEMIS images. These features, showing similarity to terrestrial shorelines, have been mapped and cataloged with significant effort [1]....
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ftnasantrs:oai:casi.ntrs.nasa.gov:20050166953 2023-05-15T13:34:40+02:00 Ice-Ridge Pile Up and the Genesis of Martian "Shorelines" Moore, J. Asphaug, E. Tulaczyk, S. Barnhart, C. J. Kraal, E. R. Unclassified, Unlimited, Publicly available [2005] application/pdf http://hdl.handle.net/2060/20050166953 unknown Document ID: 20050166953 http://hdl.handle.net/2060/20050166953 Copyright, Distribution under U.S. Government purpose rights CASI Lunar and Planetary Science and Exploration Lunar and Planetary Science XXXVI, Part 2; LPI-Contrib-1234-Pt-2 2005 ftnasantrs 2017-10-07T22:47:43Z Unique geomorphologic features such as basin terraces exhibiting topographic continuity have been found within several Martian craters as shown in Viking, MOC, and THEMIS images. These features, showing similarity to terrestrial shorelines, have been mapped and cataloged with significant effort [1]. Currently, open wave action on the surface of paleolakes has been hypothesized as the geomorphologic agent responsible for the generation of these features [2]. As consequence, feature interpretations, including shorelines, wave-cut benches, and bars are, befittingly, lacustrine. Because such interpretations and their formation mechanisms have profound implications for the climate and potential biological history of Mars, confidence is crucial. The insight acquired through linked quantitative modeling of geomorphologic agents and processes is key to accurately interpreting these features. In this vein, recent studies [3,4] involving the water wave energy in theoretical open water basins on Mars show minimal erosional effects due to water waves under Martian conditions. Consequently, sub-glacial lake flattens the surface, produces a local velocity increase over the lake, and creates a deviation of the ice flow from the main flow direction [11]. These consequences of ice flow are observed at Lake Vostok, Antarctica an excellent Martian analogue [11]. Martian observations include reticulate terrain exhibiting sharp inter-connected ridges speculated to reflect the deposition and reworking of ice blocks at the periphery of ice-covered lakes throughout Hellas [12]. Our model determines to what extent ice, a terrestrial geomorphologic agent, can alter the Martian landscape. Method: We study the evolution of crater ice plugs as the formation mechanism of surface features frequently identified as shorelines. In particular, we perform model integrations involving parameters such as ice slope and purity, atmospheric pressure and temperature, crater shape and composition, and an energy balance between solar flux, geothermal flux, latent heat, and ablation. Our ultimate goal is to understand how an intracrater ice plug could create the observed shoreline features and how these Other/Unknown Material Antarc* Antarctica NASA Technical Reports Server (NTRS) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Lunar and Planetary Science and Exploration |
spellingShingle |
Lunar and Planetary Science and Exploration Moore, J. Asphaug, E. Tulaczyk, S. Barnhart, C. J. Kraal, E. R. Ice-Ridge Pile Up and the Genesis of Martian "Shorelines" |
topic_facet |
Lunar and Planetary Science and Exploration |
description |
Unique geomorphologic features such as basin terraces exhibiting topographic continuity have been found within several Martian craters as shown in Viking, MOC, and THEMIS images. These features, showing similarity to terrestrial shorelines, have been mapped and cataloged with significant effort [1]. Currently, open wave action on the surface of paleolakes has been hypothesized as the geomorphologic agent responsible for the generation of these features [2]. As consequence, feature interpretations, including shorelines, wave-cut benches, and bars are, befittingly, lacustrine. Because such interpretations and their formation mechanisms have profound implications for the climate and potential biological history of Mars, confidence is crucial. The insight acquired through linked quantitative modeling of geomorphologic agents and processes is key to accurately interpreting these features. In this vein, recent studies [3,4] involving the water wave energy in theoretical open water basins on Mars show minimal erosional effects due to water waves under Martian conditions. Consequently, sub-glacial lake flattens the surface, produces a local velocity increase over the lake, and creates a deviation of the ice flow from the main flow direction [11]. These consequences of ice flow are observed at Lake Vostok, Antarctica an excellent Martian analogue [11]. Martian observations include reticulate terrain exhibiting sharp inter-connected ridges speculated to reflect the deposition and reworking of ice blocks at the periphery of ice-covered lakes throughout Hellas [12]. Our model determines to what extent ice, a terrestrial geomorphologic agent, can alter the Martian landscape. Method: We study the evolution of crater ice plugs as the formation mechanism of surface features frequently identified as shorelines. In particular, we perform model integrations involving parameters such as ice slope and purity, atmospheric pressure and temperature, crater shape and composition, and an energy balance between solar flux, geothermal flux, latent heat, and ablation. Our ultimate goal is to understand how an intracrater ice plug could create the observed shoreline features and how these |
format |
Other/Unknown Material |
author |
Moore, J. Asphaug, E. Tulaczyk, S. Barnhart, C. J. Kraal, E. R. |
author_facet |
Moore, J. Asphaug, E. Tulaczyk, S. Barnhart, C. J. Kraal, E. R. |
author_sort |
Moore, J. |
title |
Ice-Ridge Pile Up and the Genesis of Martian "Shorelines" |
title_short |
Ice-Ridge Pile Up and the Genesis of Martian "Shorelines" |
title_full |
Ice-Ridge Pile Up and the Genesis of Martian "Shorelines" |
title_fullStr |
Ice-Ridge Pile Up and the Genesis of Martian "Shorelines" |
title_full_unstemmed |
Ice-Ridge Pile Up and the Genesis of Martian "Shorelines" |
title_sort |
ice-ridge pile up and the genesis of martian "shorelines" |
publishDate |
2005 |
url |
http://hdl.handle.net/2060/20050166953 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(106.000,106.000,-77.500,-77.500) |
geographic |
Glacial Lake Lake Vostok |
geographic_facet |
Glacial Lake Lake Vostok |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
CASI |
op_relation |
Document ID: 20050166953 http://hdl.handle.net/2060/20050166953 |
op_rights |
Copyright, Distribution under U.S. Government purpose rights |
_version_ |
1766055578945191936 |