Evaluating the suitability of extended-range luminescence dating techniques over early and Middle Pleistocene timescales: Published datasets and case studies from Atapuerca, Spain
Evaluating the suitability of extended-range luminescence dating techniques over early and Middle Pleistocene timescales: Published datasets and case studies from Atapuerca, Spain
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DOI：
10.1016/j.quaint.2014.08.010
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发表时间：
2015-12-02
影响因子：
2.2
通讯作者：
Carbonell, Eudald
中科院分区：
文献类型：
--
作者：
Arnold, Lee J.;Demuro, Martina;Carbonell, Eudald
其他发光测年技术的出现，如热传递光激发发光(TT-OSL)、后红外激发发光(PIR-IRSL)和单个石英超颗粒的OSL测年，为建立超过传统石英OSL年龄上限的沉积矿床的数字年龄控制开辟了新的可能性。在这项研究中，我们使用两种方法评估了中更新世和早更新世时间尺度上这些扩展范围发光测年技术的可靠性：(I)作为已知年龄比较研究的一部分，迄今已发表的扩展范围发光年代学的广泛合成；(Ii)在Galeria、Sima del Elefan和Gran Dolina(西班牙阿塔普埃卡)的古人类学遗址进行的一系列新的TT-OSL和Pir-IRSL案例研究。已公布的已知年龄TT-OSL数据集(n=82)和超颗粒OSL数据集(n=3)与相关的年龄控制显示出良好的对应关系(即，适当的线性和比例关系)。已知年代的Pir-IRSL数据集(n=228)显示出更多的样本间散射，尽管人们普遍支持更严格的Pir-IRSL协议和更多高温Pir-IRSL方法在更新世晚期和中期的时间尺度上的可靠性。虽然这些可靠性评估令人鼓舞，但显然仍需要对300-400ka以外的扩展范围发光技术进行更广泛的、已知年龄的经验评估。使用单颗粒TT-OSL和Pir-IRSL测量温度225摄氏度(Pir-IR225)在阿塔普埃卡获得的年龄与独立的年龄控制相一致，其年龄范围类似于240-930ka。相比之下，使用更严格的290摄氏度测量温度获得的Pir-IRSL年代学(Pir-IR290)始终高估了阿塔普埃卡序列的预期年龄。在Gran Dolina获得的单颗粒TTOSL年龄允许计算出古人类前驱时代(单位TD6)新的加权平均年龄846+/-57ka。已知年龄的阿塔普埃卡案例研究突出了在单颗粒分析尺度上应用TT-OSL测年的可行性和优势，并表明Pir-IRSL测年协议的适用性在地点或区域尺度上可能有很大差异。总而言之，我们的分析表明，没有一种单一的扩展范围发光测年技术可能适用于所有样品。然而，总的来说，这些方法为获得可靠的年表提供了良好的潜力，当它们同时应用于单个样本时，它们可能提供最大的好处。(C)2014年爱思唯尔有限公司和INQUA。版权所有。
The emergence of alternative luminescence dating techniques, such as thermally transferred optically stimulated luminescence (TT-OSL), post-infrared infrared stimulated luminescence (pIR-IRSL) and OSL dating of individual quartz 'supergrains', has opened up new possibilities for establishing numerical age control on sedimentary deposits that exceed the traditional upper age limits of quartz OSL dating. In this study, we evaluate the reliability of these 'extended-range' luminescence dating techniques over Middle and Early Pleistocene timescales using two approaches: (i) a broad-scale synthesis of extended-range luminescence chronologies published so far as part of known-age comparison studies; (ii) a series of new TT-OSL and pIR-IRSL case studies at the palaeoanthropological sites of Galeria, Sima del Elefante and Gran Dolina (Atapuerca, Spain). The published known-age TT-OSL datasets (n = 82) and supergrain OSL datasets (n = 3) display good correspondence (i.e., suitably linear and proportion relationships) with associated age control. The known-age pIR-IRSL datasets (n = 228) display more inter-sample scatter, though there is general support for the reliability of more stringent pIR-IRSL protocols and multipleelevated temperature pIR-IRSL approaches over Late and Middle Pleistocene timescales. While these reliability assessments are encouraging, there remains a clear need for more widespread, known-age empirical assessments of extended-range luminescence techniques beyond similar to 300-400 ka. The ages obtained at Atapuerca using single-grain TT-OSL and pIR-IRSL measurement temperatures of 225 degrees C (pIR-IR225) are in agreement with independent age control over an age range spanning similar to 240-930 ka. In contrast, the pIR-IRSL chronologies obtained using a more stringent measurement temperature of 290 degrees C (pIR-IR290) consistently overestimate the expected ages of the Atapuerca sequences. The single-grain TTOSL ages obtained at Gran Dolina permit calculation of a new weighted mean age of 846 +/- 57 ka for the Homo antecessor palaeoanthropological horizon (unit TD6). The known-age Atapuerca case studies highlight the feasibility, and advantages, of applying TT-OSL dating at the single-grain scale of analysis and demonstrate that the suitability of pIR-IRSL dating protocols can vary significantly at a site or regional scale. Together, our analyses show that no single extended-range luminescence dating technique is likely to be universally applicable to all samples. Collectively, however, these approaches offer good potential for obtaining reliable chronologies, and they are likely to offer the greatest benefits when applied in tandem to individual samples. (C) 2014 Elsevier Ltd and INQUA. All rights reserved.