Item talk:Q303049

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   "name": "Extraformational sediment recycling on Mars",
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       "value": "10.1130/GES02244.1",
       "url": "https://doi.org/10.1130/GES02244.1"
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   "journal": {
     "@type": "Periodical",
     "name": "Geosphere",
     "volumeNumber": "6",
     "issueNumber": "16"
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   "datePublished": "2020",
   "dateModified": "2021-12-27",
   "abstract": "Extraformational sediment recycling (old sedimentary rock to new sedimentary rock) is a fundamental aspect of Earth\u2019s geological record; tectonism exposes sedimentary rock, whereupon it is weathered and eroded to form new sediment that later becomes lithified. On Mars, tectonism has been minor, but two decades of orbiter instrument\u2013based studies show that some sedimentary rocks previously buried to depths of kilometers have been exposed, by erosion, at the surface. Four locations in Gale crater, explored using the National Aeronautics and Space Administration\u2019s\u00a0Curiosity\u00a0rover, exhibit sedimentary lithoclasts in sedimentary rock: At Marias Pass, they are mudstone fragments in sandstone derived from strata below an erosional unconformity; at Bimbe, they are pebble-sized sandstone and, possibly, laminated, intraclast-bearing, chemical (calcium sulfate) sediment fragments in conglomerates; at Cooperstown, they are pebble-sized fragments of sandstone within coarse sandstone; at Dingo Gap, they are cobble-sized, stratified sandstone fragments in conglomerate derived from an immediately underlying sandstone. Mars orbiter images show lithified sediment fans at the termini of canyons that incise sedimentary rock in Gale crater; these, too, consist of recycled, extraformational sediment. The recycled sediments in Gale crater are compositionally immature, indicating the dominance of physical weathering processes during the second known cycle. The observations at Marias Pass indicate that sediment eroded and removed from craters such as Gale crater during the Martian Hesperian Period could have been recycled to form new rock elsewhere. Our results permit prediction that lithified deltaic sediments at the\u00a0Perseverance\u00a0(landing in 2021) and\u00a0Rosalind Franklin\u00a0(landing in 2023) rover field sites could contain extraformational recycled sediment.",
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