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- W33234464 abstract "Introduction: We have begun a four-year project to produce a geologic map of the Scandia region of Mars at 1:3,000,000 scale for publication in the USGS Scientific Investigations Map series. The primary objective of the map is to analyze and reconstruct the resurfacing history of this region in much greater detail than achieved by the previous northern plains-wide mapping effort [1-2]. This region includes (1) a broad swath of the Vastitas Borealis plains that includes various Scandia landforms and the Phoenix lander site; (2) part of the margin of the north polar plateau, Planum Boreum; and (3) the northern margin of the immense Alba Patera volcanic shield. We rely mostly on Mars Orbiter Laser Altimeter (MOLA) digital elevation models and Thermal Emission Imaging Spectrometer infrared and visual range and Context Camera images for mapping and topographic analysis. Background: Resurfacing within the study region is thought to have involved collapse, erosion, mud volcanism, and sedimentary diapirism of fluvial-lacustrine deposits originating from outflow-channel discharges from the Martian highlands into the northern plains [1-2]. Landforms interpreted as having resulted from these processes include Scandia Colles (knobs), Scandia Tholi (low rounded plateaus), and Scandia Cavi (broad, irregular depressions surrounded by rises). Furthermore, basal materials exposed along the margin of Planum Boreum may source from eroded Scandia materials [3]. Mapping results: Geologic units thus far mapped include: (1) Alba Patera shield lavas and channelized flows, (2) Vastitas Borealis materials, (3) Scandia materials, (4) the Planum Boreum rupēs and layered deposit units [4-5], and (5) circum-polar dune material (Fig. 1). The crater densities for unit areas already mapped (Fig. 1) register Hesperian surface ages (Table 1)." @default.
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- W33234464 date "2010-03-01" @default.
- W33234464 modified "2023-09-23" @default.
- W33234464 title "Nature of Hesperian Resurfacing in the Scandia-North Polar Region of Mars" @default.
- W33234464 hasPublicationYear "2010" @default.
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