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Article Dans Une Revue Journal of Archaeological Science Année : 2014

Impact of post-depositional processes on charcoal fragmentation and archaeobotanical implications: Experimental approach combining charcoal analysis and biomechanics

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Résumé

Generallyspeaking,charcoalanalysisisbasedonidentifyingandcountingcharcoalfragmentsinordertocalculatetherelativevariationsintaxafrequency.Allpost-depositionalprocessesarelikelytoinducefragmentationoftheanthracologicalmaterial,raisingthequestionoftherepresentativenessoftaxa.Basedonaninnovativeexperimentalapproachcombiningbothcharcoalanalysisandbiomechanics,thispaperexploreshowthemechanicalpropertiesofcharcoalcaninfluencethefragmentationandthequantificationofspeciesinanthracologicalassemblages.Wecarriedoutstandardizedlaboratorycompressiontestson302samplesissuedfrom10taxa,charredatthreedifferenttemperatures,inordertocharacterizethemechanicalpropertiesofcommonspeciesintemperateandMediterraneanEurope.Ourresultshighlightthedifferentialresponsesofthetestedspeciesintermsofresistancetocompressionandfragmentation,twoprocesseswhichdonotappeartobecorrelated.Charcoalisveryresistanttopressure(upto22.5MPa).Ourresultsshowthatsignificantfragmentationdifferencesexistbetweentaxa.Thetotalnumberoffragmentsaftercompressionislargelydependentonthespecies,regardlessofthecharringtemperature.However,thisinterspecificvariabilityismoresignificantforsmallfragments[1e2mm],thanforlargerfragments[2e4mm]and>4mm,withtheexceptionofQuercus,whichdisplaysdifferentialreactionstocompression.Finally,amultifactorialanalysisbringstolighttheimpactofthephysicalandanatomicalcharacteristicsofthedifferentspeciesoncharcoalfragmentation
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Dates et versions

hal-00951096 , version 1 (25-05-2016)

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Julia Chrzazvez, Isabelle Théry-Parisot, Gilbert Fiorucci, Jean-Frédéric Terralc, Bernard Thibaut. Impact of post-depositional processes on charcoal fragmentation and archaeobotanical implications: Experimental approach combining charcoal analysis and biomechanics. Journal of Archaeological Science, 2014, 44, pp.30-42. ⟨10.1016/j.jas.2014.01.006⟩. ⟨hal-00951096⟩
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