Santorini: Luminescence dating of a volcanic province using quartz? ☆
Santorini: Luminescence dating of a volcanic province using quartz? ☆
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DOI：
10.1016/s0277-3791(00)00034-2
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发表时间：
2001-12
影响因子：
4
通讯作者：
A. Bonde;A. Murray;W. Friedrich
中科院分区：
文献类型：
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作者：
A. Bonde;A. Murray;W. Friedrich
我们研究了发光测年法对爱琴海圣托里尼火山岛（北纬 36.40°，东经 25.40°）里瓦角火凝灰岩下方古土壤的应用。该地区的火山活动历史具有内在意义，对东地中海的考古学也很重要——一个繁荣的青铜时代晚期定居点被埋在米诺斯火山喷发（公元前 1640 年）的火山产物下。众所周知，使用发光技术测定火山省的年代非常困难，因为火山长石几乎总是表现出异常褪色（这可能导致年龄低估超过 50%）。石英不会表现出异常褪色，但不幸的是，它在火山沉积物中很少见或不存在，因此通常不被视为潜在的天文钟。我们研究了从里瓦角古土壤中提取的材料的发光特性，具有良好的独立年龄控制。所有样品均含有可检测到的石英，但通常< 散装沉积物的 0.01%；石英的识别主要是通过对 110°C TL 特征峰敏感的能力，以及对红外激光强红外照明没有显着的再生响应。这种石英可能是风成物，可能来自北非或当地。如果是前者，石英仅在土壤发育期间积累。蓝光（470nm）刺激的发光信号水平变化很大，尽管有化学和物理浓度，但一些等分试样没有表现出明显的自然发光或实验室剂量反应。单等分再生剂量方案已用于估计其余部分的等效剂量。尽管我们将发光材料鉴定为石英，但所有等分试样都严重低估了已知年龄，平均低估了 90%。
We have investigated the application of luminescence dating to the palaeosol underlying the Cape Riva ignimbrite from the volcanic island of Santorini (36.40°N, 25.40°E) in the Aegean Sea. The history of volcanism in this area is of intrinsic interest, and is also of importance to archaeology in the eastern Mediterranean — a flourishing late Bronze Age settlement was buried under the volcanic products of the Minoan Eruption (1640 BC). Volcanic provinces are notoriously difficult to date using luminescence techniques, because volcanic feldspars almost invariably show anomalous fading (which can lead to age underestimates of more than 50%). Quartz does not show anomalous fading, but unfortunately it is rare or non-existent in volcanic sediments, and so it is usually not considered as a potential chronometer. We have studied the luminescence characteristics of material extracted from the Cape Riva palaeosol, with good independent age control. All samples contain detectable quartz, but usually <0.01% of the bulk deposit; the quartz is identified primarily by the ability to sensitize the characteristic 110°C TL peak, and by the absence of significant regenerated response to intense infra-red illumination from an IR laser. It may be that this quartz is of aeolian origin, perhaps from North Africa or from local sources. If the former, quartz is only accumulated during the period of soil development. Blue-light (470nm) stimulated luminescence signal levels are highly variable, and despite chemical and physical concentration, some aliquots show no significant natural luminescence or laboratory dose-response. The single-aliquot regenerative-dose protocol has been used to estimate the equivalent dose in the remainder. Despite our identification of the luminescent material as quartz, all aliquots grossly underestimate the known age, by 90% on average.