Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12136/1155
|Title:||Extended-range luminescence dating of fluvial terraces (Duero basin) associated with La Maya I, II and Burganes Lower Palaeolithic (Acheulean) sites, west-central Spain|
Arnold, Lee J.
Panera Gallego, Joaquín
|Keywords:||Luminescence dating;Lower Palaeolithic;Acheulean;La Maya;Burganes;Spain;Fluvial terraces|
|Publisher:||International Union for Prehistoric and Protohistoric Sciences (IUPPS)|
|Citation:||XVIII World UISPP Congress, 2018|
|Abstract:||A large proportion of the Lower Palaeolithic (Acheulean) records from the Iberian Peninsula are associated with fluvial archives located in the major river basins of the Duero, Tajo and Guadiana drainage systems. Unfortunately, these open-air archaeological records are often difficult to constrain chronologically due to a lack of suitable material for dating (e.g., faunal remains) or because their Middle Pleistocene antiquity precludes the use of otherwise applicable geochronometric techniques, such as optically stimulated luminescence (OSL) dating of sedimentary silicates. As a result, many important Acheulean sites lack precise and accurate chronologies, and their existing temporal frameworks are based solely on morphostratigraphic correlations with regional fluvial terrace systems. Over the past 10 years, a series of ‘extended-range' OSL methodologies have been proposed for dating Middle Pleistocene deposits, which make use of luminescence signals with higher dose saturation limits. These techniques include post infrared - infrared stimulated luminescence (post IR-IRSL) dating of K-feldspars and thermally transferred-OSL (TT-OSL) dating of quartz. This study reports on the application of these extended-range luminescence methods to Lower Palaeolithic (Acheulean) sites from central-west Spain. We present results of an ongoing dating program that aims to determine the chronologies of a number of fluvial terraces associated with the archaeological sites at La Maya I, II and Burganes, all of which have produced important lithic assemblages. The sites of La Maya I, II and Burganes are located in the western sector of the northern Meseta (Spain), within the Duero drainage system. The La Maya I (+6-8 and +14 m above river level) and II (+34 m) sites and the Burganes sites (+16-20 m and +34 m) are situated on the middle terraces of the Tormes and Tera rivers, respectively. In total, seven optical dating samples were collected across the various river terraces: one sample was collected from La Maya I (+6-8 m) and one sample was collected from La Maya II (+34 m); two additional samples were obtained from the main excavation site of La Maya I (+14 m); two samples were taken from the +16-20 m Burganes terrace and one sample was collected from the +34 m Burganes terrace. Extended-range luminescence ages were determined using multi-grain post IR-IRSL dating of aliquots of K-feldspar grains and single-grain TT-OSL measurements made on individual silt-sized quartz fractions. Ages were calculated using dose rate values obtained from a combination of in situ gamma spectrometry and beta counting. We report on the suitability of the post-IR IRSL and TT-OSL signals for dating these deposits, which has been tested via a series of quality assurance criteria (signal composition, dose recovery tests, bleaching tests, sensitivity correction assessments). The resultant chronologies are presented and used to assess (i) the accuracy of existing chronostratigraphic frameworks developed at these sites, and (ii) the wider applicability of these novel dating approaches for constraining open-air, Lower Palaeolithic chronologies in the Iberian peninsula.|
|Appears in Collections:||Congresos, encuentros científicos y estancias de investigación|
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