Harmakhis Vallis Source Region,Mars: Insights into the recent geothermal history based on geological mapping |
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| Authors: | Mihaela Glamoclija Lucia Marinangeli Goro Komatsu |
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| Institution: | 1. UCD School of Geography, University College Dublin, Dublin, Ireland;2. UCD Earth Institute, University College Dublin, Dublin, Ireland;3. European Space Research & Technology Centre (ESTEC), Noordwijk, The Netherlands;1. Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, USA\n;2. Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI, USA\n;1. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina.;3. IBIGEO (Universidad Nacional de Salta-CONICET), Av. Bolivia 5150, A4400FVY Salta, Argentina;4. Núcleo Milenio Paleoclima, Universidad de Chile, Santiago, Chile;5. Instituto de Geografía, Pontificia Universidad Católica de Chile, Santiago, Chile;6. Centro de Investigaciones en Ciencias de la Tierra (CICTERRA, CONICET-Facultad de Ciencias Exactas, Físicas y Naturales, UNC), Córdoba, Argentina;7. Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, 15001, 91501-970 Porto Alegre, Brazil |
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| Abstract: | The mapped area of Harmakhis Vallis, at the eastern Hellas Planitia region (35°30–42°50′S; 91°00–97°30′E), covers the surface area of about 212,000 km2. The region displays an enhanced modification of the initial topography formed by the Hellas impact. The long and complex history of degradation and alteration involves mass-wasting processes, volcanism and fluvial activity, confronting effects of climate-induced slow mass-wasting processes to effects caused by temporary, catastrophic events (impact cratering, volcanism, etc.). Geological mapping at scale of 1:1,500,000 (full scale at 1:540,000) have been carried out on multiple co-registered data sets available from the past and ongoing orbiter missions to Mars. The mapped geomorphic features of small- and medium-scales reveal in detail events that shaped the topography of the region throughout history, providing specific constraints on the geologic and climatic history of the region. This study highlights events from the most recent Martian history, including fluvial activity recorded in relation to a debris apron flanking Centauri Montes, and evidence of recent positive geothermal anomalies of a high heat-flux with relatively small spatial extents, on the timescale of several million years ago. |
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