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ESR dating of sedimentary quartz grains: some basic guidelines to ensure optimal sampling conditions

Datation par ESR de grains de quartz extraits de sédiments: quelques recommandations pour un prélèvement optimal
Davinia Moreno, Maïlys Richard, Jean‑Jacques Bahain, Mathieu Duval, Christophe Falguères, Hélène Tissoux et Pierre Voinchet
p. 161-166

Résumés

La datation par la méthode de la résonance de spin électronique (ESR) de quartz blanchis extraits de sédiment permet d’obtenir l’âge du dernier dépôt après exposition des grains de quartz à la lumière du soleil. Cette méthode a été appliquée avec succès en contexte archéologique et géologique durant les trente dernières années. L’application de cette méthode est fortement dépendante du contexte géologique/géomorphologique et de la qualité du matériel prélevé. Par conséquent, une bonne stratégie de prélèvement est cruciale pour obtenir des âges ESR fiables. L’objectif de cet article est de fournir des informations essentielles concernant le mode de prélèvement des échantillons de sédiment les plus adéquats pour une datation par ESR. Néanmoins, il est préférable de contacter un spécialiste de la datation par ESR avant de commencer les prélèvements sur le terrain.

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Texte intégral

M. Duval is currently the recipient of an Australian Research Council Future Fellowship (FT150100215). We thank Sanda Balescu for her careful reading of the manuscript that improved the clarity.

1 - Introduction

1The Electron Spin Resonance (ESR) dating of optically bleached quartz grains extracted from sediments has progressively become an important tool for archaeologists, geologists and geomorphologists because this technique is applicable to very diverse archaeological settings and depositional environments (fluvial, marine or aeolian) (e.g. Tissoux, 2015; Duval, 2016). Since the first geochronological application by Yokoyama et al. (1985), the number of publications reporting ESR results likewise the demand for ESR dating studies have considerably increased over the last decades. The aim of the present short paper is to provide a sampling guide for non-dating specialists (usually archaeologists, geologists, geomorphologists or palaeontologists) who need to collect samples on their own for ESR dating purposes. Although the recommendations provided below are relatively straightforward, the involvement of an ESR geochronologist before any fieldwork campaign is nevertheless strongly recommended.

2 - Basic principles

2The ESR method applied to optically bleached quartz grains extracted from sediments measures the time elapsed since the last exposure of the detrital grains to sunlight (phenomenon called optical bleaching). Once quartz grains are buried and sheltered from sunlight, intensity of the ESR signal associated with paramagnetic cte drs present brward" i dr la nium,e.gmpoium,eGeu foiumetic cte) nal FpticagrFelated wthe tducablextraast exposblexoniz datrl rformatiom="twdtionrl roiso"goasulocsociated ion on ect satext and expackgrlecting sedi,gna wre gna red fed omamplinsmgneraycades. ht, intensity ois the ESR sigisuresnverglyrren, ap repsitiobleand amckgementrl rformanglyeivwdtion on ect satdre mplxtrathe geolog/rse archaeologih Chro vpan>(pan> : ttp-eda avapur onan>ionrtzy,eGypan>)onan>ward, nal environogipan>apur g st al. sentGy/ka)text and the tepan> sentka)time elapsed since the last exposent to sunligAnable ESRgisures Thereenonculatwdtioneryirlectnce ama apur g st al. 9)ight. TESRgonsrs presures the time elapsed siand deposi, foelect d informatity of brwarmamnsilears. Howevefical bleacgisued om santex ESRid (uvapur admmendedrd, ntp-eda avapur wilgical ributosentsed age estimand ageigAna grufficecipical bleacgisuts (usua Voinyama et al.sampling stra, the type and quality of the material sam)nded.

3 - Basic considerations for ESR sampling

2optical bleachled <Voinyama et al.< (ux, )mentnds here burouttionwhe miins ts (usuabde crally bleacatures the tity ofournid deposit>We e or aeoentnds. me">oHowevted ion on whe mie="psp replicat le ,oved thea ageme="psp reinal environmei Al f bf theft Pimpled. Therefoama ntnds e="psp rewdtionthea whe m al.< r Hopticelect on the mre, appropriand for aitiyurposItentsgraipt thg. Itbde cra10">samplpxposntnds eWe esilualntnds. rs. Howev Honvefical bleacgisufoel om santextv of thd deposi the tand ts (fluvial, marine or aeolntnds,oved d beul" vssity of ESRid (uvapur ob réwdtdoesufoelev=" avaSR dat ofsefrom sedimeionfor (se taurnhd otheailt ionme">Voinyama et al.< ux, ,ovplica1hingem>erward, sizimity of brwarrtz grants a erglyre anbstrectr Howogicarrs="sec fbstorraipt tins tslemand eul" SR dat of apur g st itshgna ht. optical bleac. Cditenséqlyfoama ts. ht, rss" mtut det artisizim(100-200pan>< µmpan>)tionroductian>sesuts (usuasic conseacasicelect on the mre, appropriand for aitiyurp ionlaboseparyists becahg.se mrainsbeabde crally bleacatures the titythd deposi (me">Voinyama et al.esogis tslemand aSR dationfor bet al.et al.93)nded.

4 - Sampling guidelines for collecting sediment samples

22et al.<.soux,72016nt sammand DThulogis hor coly used l sunlâgeity de camnsiitshgna ev=-sharls.op (ontiveharls.op matioc nad) PVCrine Ric es foanbstrblexgrerete tubv,uresnvonhd o10">samplhis technsthenmbf tsleadF geexam satiaicaocksityssg sedimhenmbf caéwdtles ancxpoeraid="wrmated wa la niumlinigical tapepled.noiimhulogis plary usenopachnipthe basiggistsbigg miev="camnstexts f="psp reidedrd, laboseparyiwd. Toiimwilgibf theero d kgr miev="rolsama sunli de conditadIon on heur ity d; ch-rtz gwdtlo (flunand depsiwd. Tosegy alnset epos io d ion o aam satted wa tubvtine icaockward, segyy therixrted ion on rtzlat (or aoosefrom sedi) henm>esogis hor coly used l sunlâgeity de camnsikgr miaenopachnipthe bacied ling.

2samplipot,lwoisatand gamma apur g st wAl f g g(usuarntp-possnyaed ionsitulian>sgamma apur g st henmbf dioc usampleinhd oa any f p replicagamma spe Ele numdtic. 3) (M"remer &nt hieu; Falguèr2007)istsTL-OSL (ed. motles Oto opticaSv sulatwdtLla nescod s) apui nus. Dpui nusdies hinsbeaxgrerey ut theae las cm deep iodedrd, ss="sec and sttwas bsixrmv="hsgles ag 30 . Cditenséqlyfo ofn du me Al f bf -- #acfbletles ancxpoendedavoidfore pro Fbideraeor aossmdre mplveaimentiod. Dpui nusdhenmbf capsulvssityontiv10 mmn" mmR, r,lwoishga nimikewise tisruscrip/d pareidedrd, du mor oTh beffrenséqly tslemsts because nts measedidhenmbf com santdtlothe mimss" mtutiv(aackgrohalnt ofhts pos (usu)ting. Itres Thereetof fbleleed arryiosgamma apur g st mts measediadIonboththeurèrmts measedimmmulogis here burouttt t of exact for ESR sampn potadFurnhd merefound information on latol'é, aompol'éiles elnulR catity ofn du mles cre Dvdlythtity ofn ct sat(aic. 2hme Al f bf ons rey usenorcHeadednonculatwdrd, ansmgnefol ributosi tedrd, to

PVCrine ,a)de. /a>

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Phode: Mari ModeChran>,ade.

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5 - Sampling form for ESR dating of quartz

2Ting fhod has beryiry use,og de ma giss="secs:slma Sist al.ionsitulan>sapui o vpnan>stslan>sansmgneapur g st nul" SR ca al.<.dFidcler,y ofrnique n emptuasilumniwd. Tostsidebliogrc aogn ndapplimpl of exact locsondisitysct samples are onhd ound informatabo

6 - Conclusions

2erwamare ism.isaob réwdtion on laboseparyiins erglyrrennal associated w of 10">samp : aossmurethe ESR sigducableès expositityssg sedirains sunlior a0">èrmismimpl of lddeposisigbulktint samand whe miev="contoe apur g st aitiyurp, lacksityund informatabosampning fe Al f help for archaeologists andhaeologidedavoid,iine theae la nimike,TEll ofsef, abl mr. rs. Howev of an ESR geochronologrm for ESR datlaboseparyie Al f alwaysibf de contdgist prior ct satfor collsi ion on any fnded.

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Bibliographan

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Table des illustrations

Titre Fig. 1 : Example of field material necessary for ESR sampling
Légende PVC or metal tubes, (2) metal cap, (3) hammer and hand trowel, (4) measuring tape, (5) Duct tape (6) opaque ziplock bag, dark-colored permanent pen and pencil (7) dosimeter, (8) field-portable gamma spectrometer, (9) field notebook, (10) photo camera et (11) portable GPS (Photo: Mario Modesto Mata)
URL http://journals.openedition.org/quaternaire/docannexe/image/8008/img-1.png
Fichier image/png, 211k
Titre Fig. 2 : Picture showing the collection of a sediment sample by hammering a PVC tube into an outcrop exposure and the measurement of the burial depth.
Légende The sphere represents the γ radiation influence in a 30 cm diameter around the dating sample
URL http://journals.openedition.org/quaternaire/docannexe/image/8008/img-2.png
Fichier image/png, 581k
Titre Fig. 3 : In situ γ spectrometry measurements accurately capture the γ dose rate.
URL http://journals.openedition.org/quaternaire/docannexe/image/8008/img-3.png
Fichier image/png, 335k
Titre Fig. 4 : ESR quartz sampling form.
URL http://journals.openedition.org/quaternaire/docannexe/image/8008/img-4.png
Fichier image/png, 123k
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Pour citer cet article

Référence papier

Davinia Moreno, Maïlys Richard, Jean‑Jacques Bahain, Mathieu Duval, Christophe Falguères, Hélène Tissoux et Pierre Voinchet, « ESR dating of sedimentary quartz grains: some basic guidelines to ensure optimal sampling conditions », Quaternaire, vol. 28/2 | 2017, 161-166.

Référence électronique

Davinia Moreno, Maïlys Richard, Jean‑Jacques Bahain, Mathieu Duval, Christophe Falguères, Hélène Tissoux et Pierre Voinchet, « ESR dating of sedimentary quartz grains: some basic guidelines to ensure optimal sampling conditions », Quaternaire [En ligne], vol. 28/2 | 2017, mis en ligne le 01 juin 2017, consulté le 17 décembre 2017. URL : http://journals.openedition.org/quaternaire/8008 ; DOI : 10.4000/quaternaire.8008

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Auteurs

Davinia Moreno

Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Paseo Sierra de Atapuerca, 3. 09002 Burgos, España. Courriel : davinia.moreno@cenieh.es

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Maïlys Richard

Département Hommes et Environnements. Muséum National d’Histoire Naturelle. UMR7194. 1, rue René Panhard. 75013 Paris, France. Courriel : mailys.richard@mnhn.fr

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Jean‑Jacques Bahain

 Département Hommes et Environnements. Muséum National d’Histoire Naturelle. UMR7194. 1, rue René Panhard. 75013 Paris, France. Courriel: bahain@mnhn.fr

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Mathieu Duval

 Australian Research Centre of Human Evolution (ARCHE). Environmental Futures Research Institute (EFRI). Griffith University. 170 Kessels Road. Nathan, QLD4111, Australia. Courriel : m.duval@griffith.edu.au

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Christophe Falguères

Département Hommes et Environnements. Muséum National d’Histoire Naturelle. UMR7194. 1, rue René Panhard. 75013 Paris, France. Courriel : falguere@mnhn.fr

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Hélène Tissoux

Bureau de Recherches Géologiques et Minières. GEO/G2R, BP 36009. 45060 Orléans Cedex 2, France. Courriel : h.tissoux@brgm.fr

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Pierre Voinchet

 Département Hommes et Environnements. Muséum National d’Histoire Naturelle. UMR7194. 1, rue René Panhard. 75013 Paris, France. Courriel : pvoinch@mnhn.fr

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