ESR dating of Chinese loess using the quartz Ti centre: A comparison with independent age control
ESR dating of Chinese loess using the quartz Ti centre: A comparison with independent age control
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DOI：
10.1016/j.quaint.2019.04.003
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发表时间：
2019-04
影响因子：
2.2
通讯作者：
M. Richter;S. Tsukamoto;H. Long
中科院分区：
文献类型：
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作者：
M. Richter;S. Tsukamoto;H. Long
通过对中国黄土高原洛川遗址黄土的ESR年龄与参考年龄的对比，验证了石英电子自旋共振（ESR）测年Ti心的可靠性。用单等分再生剂量（SAR）方案代替常用的多等分附加剂量（MAAD）方案计算5个样品的等效剂量（De）值，预期年龄范围为28.5±2.9 ka（单位L1）~ 646±65 ka（单位L 6）。然后，利用同一地点的样品的Ti中心寿命（1.7× 106年）对表观年龄（59.4±3.8 ~ 517±42 ka）进行了热信号损失校正。校正年龄为60.4±3.8 ~ 617±50 ka。对于最年轻的两个样本的表观年龄和校正年龄高估了预期的年龄，这可能是由于不完整的信号重置埋葬前。最古老的样品的表观年龄显示年龄低估了20%，但在对Ti中心的热信号损失进行校正后，年龄与参考年龄一致。L3和L4的表观年龄和校正年龄与预期年龄吻合良好。我们表明，仔细考虑样品的热稳定性和漂白性，使用Ti中心的可靠年龄计算是可能的。
The reliability of quartz electron spin resonance (ESR) dating using the Ti centre was tested through a comparison of the ESR ages of loess from the Luochuan site, Chinese loess plateau, with reference ages. Instead of the commonly used multiple-aliquot additive dose (MAAD) protocol, the single-aliquot regenerative dose (SAR) protocol was used to calculate the equivalent dose (D e) values of five samples, with expected ages ranging from 28.5±2.9 ka (unit L1) to 646±65 ka (unit L6). The apparent ages, ranging from 59.4±3.8 to 517±42 ka, were then corrected for thermal signal loss, using the lifetime of the Ti centre,∼ 1.7× 10 6 years, previously calculated for a sample from the same site. The corrected ages ranged from 60.4±3.8 ka to 617±50 ka. For the youngest two samples both apparent and corrected ages overestimated the expected ages, which was presumably caused by incomplete signal resetting before burial. The apparent age of the oldest sample showed an age underestimation of∼ 20%, but after the thermal signal loss from the Ti centre was corrected for, the age was consistent with the reference age. Both apparent and corrected ages of L3 and L4 are in good agreement with expected ages. We show, that with careful consideration of the thermal stability and bleachability of samples, reliable age calculation using the Ti centre is possible.