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- W2801228423 endingPage "108738" @default.
- W2801228423 startingPage "108738" @default.
- W2801228423 abstract "The location, longevity, and geographic extent of late Paleozoic ice centers in west-central Gondwana remain ambiguous. Paleovalleys on the Rio Grande do Sul Shield of southernmost Brazil have previously been interpreted as fjords carved by outlet glaciers that originated in Africa and emptied into the Paraná Basin (Brazil). In this study, the sedimentology, stratigraphy, and provenance of sediments infilling two such paleovalleys (the Mariana Pimentel and Leão paleovalleys) were examined in order to test the hypothesis that an ice center over present day Namibia drained across southernmost Brazil during the Carboniferous and Permian. Contrary to previous findings, the facies assemblage from within the paleovalleys is inconsistent with a fjord setting and no clear evidence for glaciation was observed. The facies show a transition from a non-glacial lacustrine/estuarine environment, to a fluvial-dominated setting, and finally to a restricted marine/estuarine environment. Detrital zircon results present a single population of Neoproterozoic ages (c. 800–550 Ma) from the paleovalley fill that matches the ages of underlying igneous and metamorphic basement (Dom Feliciano Belt) and is incongruent with African sources that contain abundant older (Mesoproterozoic, Paleoproterozoic, and Archean) zircons. Furthermore, results suggest that the formation of the paleovalleys and the deposition of their fill were controlled by the reactivation of Neoproterozoic basement structures during the Carboniferous and Permian. The lack of evidence for glaciation in these paleovalleys highlights the need for detailed studies of supposed late Paleozoic glacial deposits. These results are supportive of the hypothesis that well-established glacial sediments on the Rio Grande do Sul Shield (southern margin of the Paraná Basin) may be the product of a separate lobe extending north across Uruguay, rather than a single, massive ice sheet draining west from Africa." @default.
- W2801228423 created "2018-05-17" @default.
- W2801228423 creator A5015296794 @default.
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- W2801228423 creator A5087573695 @default.
- W2801228423 date "2019-10-01" @default.
- W2801228423 modified "2023-10-14" @default.
- W2801228423 title "Origin of paleovalleys on the Rio Grande do Sul Shield (Brazil): Implications for the extent of late Paleozoic glaciation in west-central Gondwana" @default.
- W2801228423 cites W1934469433 @default.
- W2801228423 cites W1966199143 @default.
- W2801228423 cites W1970179993 @default.
- W2801228423 cites W1973450563 @default.
- W2801228423 cites W1973923773 @default.
- W2801228423 cites W1974012749 @default.
- W2801228423 cites W1975984118 @default.
- W2801228423 cites W1981181170 @default.
- W2801228423 cites W1983420632 @default.
- W2801228423 cites W1986671184 @default.
- W2801228423 cites W1987113555 @default.
- W2801228423 cites W1987303325 @default.
- W2801228423 cites W1990188080 @default.
- W2801228423 cites W1991647533 @default.
- W2801228423 cites W2001371481 @default.
- W2801228423 cites W2002476295 @default.
- W2801228423 cites W2002830414 @default.
- W2801228423 cites W2003082752 @default.
- W2801228423 cites W2007383910 @default.
- W2801228423 cites W2008841345 @default.
- W2801228423 cites W2009633457 @default.
- W2801228423 cites W2009732140 @default.
- W2801228423 cites W2009823972 @default.
- W2801228423 cites W2011101426 @default.
- W2801228423 cites W2011240621 @default.
- W2801228423 cites W2011270646 @default.
- W2801228423 cites W2019911729 @default.
- W2801228423 cites W2026375365 @default.
- W2801228423 cites W2026705708 @default.
- W2801228423 cites W2027000726 @default.
- W2801228423 cites W2027778947 @default.
- W2801228423 cites W2030989612 @default.
- W2801228423 cites W2034659250 @default.
- W2801228423 cites W2035178161 @default.
- W2801228423 cites W2037146927 @default.
- W2801228423 cites W2037767757 @default.
- W2801228423 cites W2037870312 @default.
- W2801228423 cites W2039007993 @default.
- W2801228423 cites W2039570402 @default.
- W2801228423 cites W2041900866 @default.
- W2801228423 cites W2046822174 @default.
- W2801228423 cites W2047421554 @default.
- W2801228423 cites W2049842406 @default.
- W2801228423 cites W2051322392 @default.
- W2801228423 cites W2051354490 @default.
- W2801228423 cites W2052231935 @default.
- W2801228423 cites W2056177186 @default.
- W2801228423 cites W2056917941 @default.
- W2801228423 cites W2057625494 @default.
- W2801228423 cites W2060522509 @default.
- W2801228423 cites W2065121222 @default.
- W2801228423 cites W2068969069 @default.
- W2801228423 cites W2069792062 @default.
- W2801228423 cites W2072641856 @default.
- W2801228423 cites W2073431684 @default.
- W2801228423 cites W2078136609 @default.
- W2801228423 cites W2080300299 @default.
- W2801228423 cites W2086729160 @default.
- W2801228423 cites W2087449343 @default.
- W2801228423 cites W2091479136 @default.
- W2801228423 cites W2105079564 @default.
- W2801228423 cites W2112594191 @default.
- W2801228423 cites W2118406753 @default.
- W2801228423 cites W2119017224 @default.
- W2801228423 cites W2123559756 @default.
- W2801228423 cites W2129090345 @default.
- W2801228423 cites W2134904696 @default.
- W2801228423 cites W2136136321 @default.
- W2801228423 cites W2138896959 @default.
- W2801228423 cites W2144854289 @default.
- W2801228423 cites W2146997175 @default.
- W2801228423 cites W2166942400 @default.
- W2801228423 cites W2167379755 @default.
- W2801228423 cites W2177207455 @default.
- W2801228423 cites W2229481061 @default.
- W2801228423 cites W2251914726 @default.
- W2801228423 cites W2300459009 @default.
- W2801228423 cites W2334002538 @default.
- W2801228423 cites W2343461592 @default.
- W2801228423 cites W2464275175 @default.
- W2801228423 cites W2464905846 @default.
- W2801228423 cites W2513821992 @default.
- W2801228423 cites W2519561677 @default.