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• W2032085939 abstract "Detrital modes of the Colorado River (Argentina) sands provide a clear example of contradictory plate tectonic interpretations of depositional paleoenvironments. The sands were derived from an arc adjacent to the leading edge of the South American Plate and deposited in areas progressively closer to a trailing edge downstream. These sediments are rich in unstable volcanic rock fragments and, in lesser proportions, feldspars (mainly plagioclase). Two kinds of deposits are present within the Colorado River: proximal sands and gravels that characterize a back-arc basin and are derived mainly from a volcanic arc; and distal sands with the same provenance. The average detrital mode for proximal sands is QM-F-L 8-39-53. The average for intermediate sands is 13-30-57, and the distal average mode is 18-22-60. These data are coherent with the average composition of Argentinian coastal sands between the Rio de La Plata and Tierra del Fuego. The data show that sand composition is controlled by the relief, drainage systems, climate, and the tectonic environment of the source area, which is not necessarily the tectonic environment of deposition. Las modas detríticas de las arenas finas del Rio Colorado de Argentina muestra una composición contradictoria para la interpretación de los ambientes tectónicos de depositación. Estas arenas derivan de un arco magmático adyacente al margen activo de la Placa SudAmericana, y fueron depositadas en áreas progresivamente más cercanas al margen pasivo, aguas abajo. Estos sedimentos son ricos en fragmentos volcánicos inestables y feldespatos (principalmente plagioclasa) en menor proporción. Dos clases de depósitos se presentan en este río, las arenas proximales que caracterizan a una cuenca de retroarco y que derivan del arco magmático, y las arenas distales, que muestran la misma procedencia. La moda detrítica promedio para las arenas proximales es QM-F-L 8-39-53. Para las arenas intermedias es 13-30-57, y para las distales es 18-22-60. Estos datos son coherentes con la composición promedio de las areniscas de la costa Argentina entre el Rio de La Plata y Tierra del Fuego. Los datos muestran que la composición de las arenas está controlada por el relieve, los sistemas de drenaje, el clima y el ambiente tectónico de las árenas de aporte, que no es necesariamente el mismo que el de las áreas de depositación." @default.
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• W2032085939 date "1990-01-01" @default.
• W2032085939 modified "2023-10-09" @default.
• W2032085939 title "The Colorado River of Argentina: Source, climate, and transport as controlling factors on sand composition" @default.
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• W2032085939 doi "https://doi.org/10.1016/0895-9811(90)90018-v" @default.
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