Show simple item record

dc.creatorPino-Quivira, Mario Alberto
dc.creatorAbrazúa, Ana M
dc.creatorAstorga, Giselle
dc.creatorMartel-Cea, Alejandra
dc.creatorSilva, Nathalie
dc.creatorNavarro-Harris, Ximena
dc.creatorLabarca, Rafael
dc.creatorLeCompte, Malcolm
dc.creatorAdedeji, Víctor
dc.creatorMoore, Christopher
dc.creatorBunch, Ted
dc.creatorMooney, Charles
dc.creatorWolbach, Wendy S
dc.creatorKennett, James P
dc.date.accessioned2019-08-13T16:31:07Z
dc.date.available2019-08-13T16:31:07Z
dc.date.issued2015es_CL
dc.identifier.urihttp://hdl.handle.net/10533/236457
dc.description.abstractYounger Dryas (YD) impact theory posits that fragments of a disintegrating giant comet struck North America, South America, Europe, and western Asia ~12,800 years ago. These airbursts/impacts produced the YD boundary layer (YDB), containing anomalously high concentrations of platinum, high-temperature spherules, meltglass, and nanodiamonds, providing an isochronous datum at 50 sites across ~50 million km² of Earth. This event triggered extensive biomass burning, “impact winter,” the YD climatic episode, and extinction of millions of late Pleistocene megafauna. In the first extensive investigation south of the equator, we report a 12,800-year-old stratum at Pilauco in northwestern Chilean Patagonia (~40° S), exhibiting peak abundances in impact-related platinum, palladium, gold, high-temperature Fe-rich and Cr-rich impact spherules, and native iron grains rarely found on Earth. Furthermore, a major peak in charcoal marks an intense biomass-burning episode, synchronous with a dramatic decrease in seeds and shift in vegetation, reflecting abrupt climatic warming at the YD onset, anti-phased with cooling over the Northern Hemisphere. The sudden disappearance of megafaunal bones and dung fungi (Sporormiella) at Pilauco is synchronous with megafaunal extinction over the Americas. The Pilauco evidence is consistent with the occurrence of local cosmic impacts, coeval with other 12,800-year-old YDB cosmic impacts on four continents.es_CL
dc.language.isoenges_CL
dc.relationinstname: Conicyt
dc.relationreponame: Repositorio Digital RI2.0
dc.rightsinfo:eu-repo/semantics/openAccesses_CL
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/*
dc.titleNorthwestern Chilean Patagonia sediment record supports YDB cosmic impact triggering of biomass burning, climate change, and megafaunal extinctions (~12.8 ka)es_CL
dc.typeManuscrito
dc.identifier.folio1150738es_CL
dc.description.pages25es_CL
dc.relation.projectidinfo:eu-repo/grantAgreement//1150738es_CL
dc.relation.setinfo:eu-repo/semantics/dataset/hdl.handle.net/10533/93482
dc.type.driverinfo:eu-repo/semantics/text


Files in this item

FilesSizeFormatView

There are no files associated with this item

This item appears in the following Collection(s)

Show simple item record

info:eu-repo/semantics/openAccess
Except where otherwise noted, this item's license is described as info:eu-repo/semantics/openAccess