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NotificationsNotify me of updates to Lakes beyond the Earth: Dry Lakebeds on Mars, and Active Methane-Ethane Lakes on Titan pp. 125-138
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Lakes beyond the Earth: Dry Lakebeds on Mars, and Active Methane-Ethane Lakes on Titan pp. 125-138 $100.00
Authors:  (Akos Kereszturi, Collegium Budapest Institute for Advanced Study, Hungarian Astronomical Association, Karoly Nagy Astronomical Foundation, Eotvos Lorand University of Sciences, Hungary)
Abstract:
Ancient water-filled lakebeds were identified on Mars based on shorelines, terraces, sedimentary deltas, in- and outflow valleys, mineral alterations, sedimentary plains and cracks possibly formed during the drying phase. Most of them were probably fed by precipitation or ice melting, and formed at low latitudes before 3.5 billion years under warmer climate. Later in colder periods, ephemeral lakes with ponded water from outbreak of subsurface aquifers were still present, as well as impact of volcanic activity melted lakes. Many lakes were covered with ice layer, and salts decreased the melting point of their water. Their sediments may hold important information of the ancient climate, chemical alterations and the possibility of life.
Lakes on Titan, on the moon of Saturn are present today, where liquid methane-ethane mixture fills about 400 observed lakes in the polar region. The temperature only in the polar region is low enough (about -179 C) for the liquids to remain stable, while at lower latitudes only dry lakebeds are present. Lakes smaller than 20 km fill roughly circular depressions, while larger lakes have dissected shorelines. Inflow rivers are observed, and subsurface contribution may also be present. Lakes play an important role in the methane cycle of Titan: evaporation, cloud formation and rain events happen above them. Organic sediments may have accumulated at the bottom of lakes, and their characteristics help to reconstruct pathways of abiotic organic material synthesis, which is important to understand prebiotic chemical processes on the Earth too. 


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Lakes beyond the Earth: Dry Lakebeds on Mars, and Active Methane-Ethane Lakes on Titan pp. 125-138