Nature, origin, transport and deposition of andosol parent material in south-central Chile (36-42°S)
MetadataShow full item record
The andosols of south-central Chile (36-42°S) are developed on yellow-brown loams that cover the region with a thickness of several meters. In the literature, several hypotheses concerning the nature, origin, mode of transport and deposition of the andosol parent material have been advanced but no general agreement has been found. In this paper, we test these hypotheses by analyzing new representative outcrops located around Icalma (38°50’S) and Puyehue (40°40’S) lakes by a plurimethodological approach. Our data demonstrate that the andosol parent material has the typical mineralogical and geochemical signature of the regional volcanism and that these deposits are postglacial in age. The grain size of the deposits and the morphology of the coarse grains evidence that most of these particles haven’t been re-transported by wind but are direct volcanic ash falls deposited throughout the Late Glacial and Holocene. Because of the prevailing westerly winds, most of them have been transported to the East. Following the deposition of the volcanic particles, weathering and pedogenetic processes have transformed part of the volcanic glasses and plagioclases into allophane and have wiped out the original layering. This work demonstrates that most of the andosols that occur in the Andes and in the eastern part of the Intermediate Depression of south-central Chile are developed on volcanic ashes directly deposited by successive volcanic eruptions throughout the Late Glacial and Holocene.
Author Posting. © Elsevier B.V., 2007. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in CATENA 73 (2008): 10-22, doi:10.1016/j.catena.2007.08.003.
Showing items related by title, author, creator and subject.
Tephrostratigraphy of the late glacial and Holocene sediments of Puyehue Lake (Southern Volcanic Zone, Chile, 40°S) Bertrand, Sebastien; Castiaux, Julie; Juvigne, Etienne (2008-05-29)We document the mineralogical and geochemical composition of tephra layers identified in the late Quaternary sediments of Puyehue Lake (Southern Volcanic Zone of the Andes, Chile, 40°S) to identify the source volcanoes ...
Stratus 15 fifteenth setting of the Stratus Ocean Reference Station cruise on board RV Cabo de Hornos June 15 – 29, 2016 Valparaiso, Chile – Valparaiso, Chile Bigorre, Sebastien P.; Weller, Robert A.; Lord, Jeffrey; Hasbrouck, Emerson; Pietro, Benjamin; Gazale, Dario Torres; Jiménez, Ignacio Burgos (Woods Hole Oceanographic Institution, 2016-10)The Ocean Reference Station at 20°S, 85°W under the stratus clouds west of northern Chile is being maintained to provide ongoing climate-quality records of surface meteorology, air-sea fluxes of heat, freshwater, and ...
Stratus 13 thirteenth setting of the Stratus Ocean Reference Station cruise on board RV Ron Brown February 25 - March 15, 2014 Valparaiso, Chile - Arica, Chile Bigorre, Sebastien P.; Weller, Robert A.; Lord, Jeffrey; Galbraith, Nancy R.; Whelan, Sean P.; Coleman, James; Contreras, Marcela Pas; Aguilera, Cristobal (Woods Hole Oceanographic Institution, 2014-07)The Ocean Reference Station at 20°S, 85°W under the stratus clouds west of northern Chile is being maintained to provide ongoing climate-quality records of surface meteorology, air-sea fluxes of heat, freshwater, and ...