{"refrec":{"BRefID":209930,"RR":"<b>Abarzua, A. M.; Jarpa, L.; Martel, A.; Vega, R.; Pino, M.</b> (2010). Multiproxy approach revealing climate and cultural changes during the last 26kyrs in south-central Chile. <i>Geophys. Res. Abstr. 12(EGU2010-11953-1)</i>","BEntID":201902,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Geophys. Res. Abstr. 12(EGU2010-11953-1)</i>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Abarzua, A. M.; Jarpa, L.; Martel, A.; Vega, R.; Pino, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Abarzua, A. M. <i>et al.</i>","Englishabstract":"Multiproxy approach from Purén Lumaco Valley (38°S) describes the paleonvironmental history during the Last Maximum Glacial (LGM) in south-central Chile. Three sediment cores and severals AMS <sup>14</sup>C dates were used to perform a complete pollen, diatoms, chironomids, and sedimentological records demonstrating the existence of a large and non profundal paleolake, between 25 and 20kyr BP.Some of these evidence are laminated silty-clay sediments (lacustrine rhythmites), associated with the presence of siderite mineral (FeCO<sub>3</sub>), besides biological proxies like <i>Fragilaria construens</i> and <i>Stauroforma inermes</i> (planctonic diatoms), and <i>Dicrotendipes</i> sp. and <i>Tanytarsini</i> tribe (littoral chironomids). The pollen ensemble reveals the first glacial refuge of <i>Araucaria araucana</i> forests in the low lands during the LGM.The lake was drained abruptly into a swamp/bog at 12kyr BP and colonized by Myrtaceae wet forest. This evidence suggest the dry/warm climate period of early Holocene in south-central Chile. Later, the sediments indicate variable lacustrine levels, and increase of charcoal particles, associated to current climatic conditions. The pollen spectrum dominated by Myrtaceae and Nothofagus contrasts with a strongly disturb current landscape. Actually, Purén-Lumaco valley constitutes a complex peat-bog system dominated by exotic grasses and forest species (<i>Tritricum aestivum, Pinus radiata</i> and <i>Eucalyptus</i> spp.).Some archaeological antecedents in the area document the human development at ca. 7yrs BP. The greatest archaeological characteristic present in the valley is the kuel, a Mapuche earth accumulation. The presence and extension of almost 300 kuel in the valley reflect the social/economic development, and partly explains why the region was the major resistance area for Spanish colonizer during XVI-XVII centuries. Also the archaeological findings reveal the presence of maize pollen (<i>Zea mays</i>) within their food consumption.The influence of climate and human impact in Holocene environments provide a better basis for understanding and managing the present landscape in Araucanian Region. Almost the absence of native forests in the area makes urgent strategies for the recovery and rehabilitation of a relict ecosystem that today represents their regional analog only in the tops of the Chilean Coastal Range.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Multiproxy approach revealing climate and cultural changes during the last 26kyrs in south-central Chile","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2010,"MonPub":null,"DateUpdate":"2013-03-05","DateCreate":"2011-11-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":209930,"PubliDate":2010,"Pagination":null,"XtraPublOfAnaID":null,"ISBN":null,"Volume":"12","Issue":"EGU2010-11953-1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":77248,"SerRR":"Geophysical Research Abstracts. Copernicus: Katlenburg-Lindau.  ISSN 1029-7006; e-ISSN 1607-7962","StandardTitleSer":"Geophysical Research Abstracts","ISSN":"1029-7006","AbbrevSer":"Geophys. Res. Abstr.","StandardTitleMon":null,"StartPage":null,"Pages":null,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Abarzua","Firstname":"Ana","Initials":"A. M.","Affiliation":"Renard Center of Marine Geology, University of Ghent","Discriminator":null,"CorporateFlag":0,"BEntID":201902,"AutID":136286,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":"RCMG","InsFSN":"Universiteit Gent; Faculteit Wetenschappen; Vakgroep Geologie; Renard Centre of Marine Geology","ORCID":null,"PersID":28572,"InsID":74},{"AutName":"Jarpa","Firstname":"Leonora","Initials":"L.","Affiliation":"Instituto de Geociencias. Universidad Austral de Chile","Discriminator":null,"CorporateFlag":0,"BEntID":201902,"AutID":136287,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Martel","Firstname":"Alejandra","Initials":"A.","Affiliation":"Instituto de Geociencias. Universidad Austral de Chile","Discriminator":null,"CorporateFlag":0,"BEntID":201902,"AutID":136288,"OrderNr":3,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Vega","Firstname":"Rodrigo","Initials":"R.","Affiliation":"Instituto de Geociencias. 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