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- W1755253411 abstract "The Cassini spacecraft executed a close flyby of Enceladus on August 11 (altitude: 50km); two moreare planned for October 9 (altitude: 25 km), and October 31 (altitude: 196 km). High resolution (asfine as 7m/pixel) images of known geologically active features in the South Polar Terrain (SPT) havebeen returned to investigate how plume eruptions, tectonism, and seismicity alter the surface and toreveal how the SPT has evolved over time. We examined six known eruption sites (Spitale and Porco2007, Nature 449, 695697)along Cairo, Baghdad, and Damascus Sulci, as well as inactive portions ofthe and bright fractured terrain in adjacent areas. We also obtained contiguous ISSbroadband multispectralmosaics of the entire SPT region to refine our geological and digital terrainmaps and to search for volcanically and tectonically driven temporal changes.The highestresolutionimages show ice blocks up to tens of meters in size that are widely but nonuniformlydistributed over a variety of terrain units. The upraised flanks and valley walls of activetiger stripes are mantled in places by smooth fluffylookingdeposits, most likely accumulations ofcoarsegrainedplume fallout. With increasing lateral distance from the stripes, the smooth upraisedflank deposits grade into rounded, platytextured,elongate hills and a conspicuous system of quasiparallelknobby ridges and grooves that have spacings and dimensions comparable to the tiger stripeflanks themselves. Peculiar narrow lenticular ridges, perhaps emplaced by extrusion or as icypyroclastic deposits, rise from tens to hundreds of meters along the medial fissures of some tigerstripes. On regional scales, the ends of the tiger stripes are bounded by a complex network of fracturedterrain, within which can be found numerous transform faults that lie at high angles relative to thetrends of the tiger stripes. Observed offsets along these transforms and an absence of lateral symmetryof the displaced terrains suggest that tiger stripes are not exact analogs to classic terrestrial oceanicrifts. Instead, any possible tectonic divergence is more likely a result of the superposition of manyregionally and temporally distributed spreading centers." @default.
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- W1755253411 date "2008-12-01" @default.
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- W1755253411 title "Enceladus' South Polar Terrain Geology: New Details from Cassini ISS High Resolution Imaging" @default.
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