Luminescence dating and palaeomagnetic age constraint on hominins from Sima de los Huesos, Atapuerca, Spain
Luminescence dating and palaeomagnetic age constraint on hominins from Sima de los Huesos, Atapuerca, Spain
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DOI：
10.1016/j.jhevol.2013.12.001
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发表时间：
2014-02-01
影响因子：
3.2
通讯作者：
Carbonell, Eudald
中科院分区：
文献类型：
--
作者：
Arnold, Lee J.;Demuro, Martina;Carbonell, Eudald
建立一个可靠的年代学在西玛德洛斯韦索斯广泛的人类遗骸是至关重要的复杂的进化历史和欧洲中更新世人类记录的系统发育关系的理解。在这项研究中，我们使用的“扩展范围”的发光测年技术和古地磁相结合，提供新的沉积充填物，明确与司马化石组合的年龄限制。钾长石的后红外-红外受激发光（pIR-IR）测年和单个石英颗粒的热转移光释光（TT-OSL）测年分别为含人粘土角砾岩上的异地沉积层提供了433 +/- 15 ka（数千年）和416 +/- 19 ka的加权平均年龄。该存款获得的6个重复发光年龄是可重复的，并提供了一个合并的最小年龄估计为427 +/- 12 ka的底层人类化石。发光测年的沉积层和下伏含粘土的古地磁方向显示完全正常的极性。这些发现与释光测年结果一致，并证实了人类化石层位在Brunhes Chron期间积累，即，在过去的780 ka。西玛人的新的括号年龄限制与辐射测年的海德堡人化石遗址，如毛尔和阿拉戈，广泛一致，并表明H。neanderthalensis和H.智人谱系发生在中更新世早期。需要对欧洲早更新世和中更新世的关键化石遗址进行更广泛的数字测年，以测试和完善人类进化的竞争模型。在这项研究中提出的新的发光年表证明了TT-OSL和pIR-IR技术的多功能性和潜在的作用，他们可以发挥帮助完善中更新世时间尺度的进化历史。(C)2013爱思唯尔有限公司版权所有。
Establishing a reliable chronology on the extensive hominin remains at Sima de los Huesos is critical for an improved understanding of the complex evolutionary histories and phylogenetic relationships of the European Middle Pleistocene hominin record. In this study, we use a combination of 'extended-range' luminescence dating techniques and palaeomagnetism to provide new age constraint on sedimentary infills that are unambiguously associated with the Sima fossil assemblage. Post-infrared-infrared stimulated luminescence (pIR-IR) dating of K-feldspars and thermally transferred optically stimulated luminescence (TT-OSL) dating of individual quartz grains provide weighted mean ages of 433 +/- 15 ka (thousands of years) and 416 +/- 19 ka, respectively, for allochthonous sedimentary horizons overlying the hominin-bearing clay breccia. The six replicate luminescence ages obtained for this deposit are reproducible and provide a combined minimum age estimate of 427 +/- 12 ka for the underlying hominin fossils. Palaeomagnetic directions for the luminescence dated sediment horizon and underlying fossiliferous clays display exclusively normal polarities. These findings are consistent with the luminescence dating results and confirm that the hominin fossil horizon accumulated during the Brunhes Chron, i.e., within the last 780 ka. The new bracketing age constraint for the Sima hominins is in broad agreement with radiometrically dated Homo heidelbergensis fossil sites, such as Mauer and Arago, and suggests that the split of the H. neanderthalensis and H. sapiens lineages took place during the early Middle Pleistocene. More widespread numerical dating of key Early and Middle Pleistocene fossil sites across Europe is needed to test and refine competing models of hominin evolution. The new luminescence chronologies presented in this study demonstrate the versatility of TT-OSL and pIR-IR techniques and the potential role they could play in helping to refine evolutionary histories over Middle Pleistocene timescales. (C) 2013 Elsevier Ltd. All rights reserved.