Author(s): Sanchez-Moreno, Elisa M; Calvo-Rathert, Manuel; Goguitchaichvili, Avto; Tauxe, Lisa; Vashakidze, George T; Lebedev, Vladimir A | Abstract: SUMMARY A palaeointensity study has been carried out on a Pliocene sequence of 20 consecutive lava flows where previous directional results seem to reflect anomalous behaviour of the Earth's magnetic field (EMF), which can be explained by a polarity transition record or non-averaged palaeosecular variation or both. Here, we perform a total of 55 palaeointensity determinations using the original Thellier–Thellier (TT) method and 100 with the IZZI method. We assess the performance of our selection criteria using a set of strict threshold values applied to a set of test data whose TRMs were acquired in known fields. Absolute palaeointensity determinations that passed our selection criteria were obtained on four specimens with the TT method and on 41 specimens with the IZZI method. Application of reliability criteria at a site level yielded palaeointensity results in 8 of 20 studied lava flows. We obtained median values of VADM between 28.9 and 45.6 ZAm2 for the reverse polarity lower Apnia section, while the normal polarity upper section displayed a single value of 54.6 ZAm2. The low palaeointensity values before a transitional direction lava flow and the higher value after it, suggest the common behaviour at the start of a polarity reversal and the recovery after it. However, an isolated record of a stable EMF, where the intensity is lower than the current for the same location (83.7 ZAm2), cannot be discarded. Consequently, this interpretation would support a weak time-averaged field.

中文翻译：

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来自小高加索（格鲁吉亚）的上新世火山序列的弱古强度结果：过渡记录还是时间平均场？

作者：Sanchez-Moreno，Elisa M；卡尔沃-拉特，曼努埃尔；Goguitchaichvili, Avto; 塔克斯，丽莎；瓦沙基泽，乔治·T；列别杰夫，弗拉基米尔 A | 摘要：总结 对 20 个连续熔岩流的上新世序列进行了古强度研究，其中先前的定向结果似乎反映了地球磁场 (EMF) 的异常行为，这可以通过极性转换记录或非平均来解释古世变或两者兼而有之。在这里，我们使用原始的 Thellier-Thellier (TT) 方法进行了总共 55 次古强度测定，使用 IZZI 方法进行了 100 次古强度测定。我们使用一组严格的阈值来评估我们的选择标准的性能，这些阈值应用于一组测试数据，其 TRM 是在已知领域中获得的。通过我们的选择标准的绝对古强度测定是通过 TT 方法在 4 个样本和 IZZI 方法的 41 个样本上获得的。在站点级别应用可靠性标准在 20 个研究的熔岩流中的 8 个中产生了古强度结果。我们获得的 VADM 中值介于 28.9 和 45.6 ZAm2 之间的反向极性下呼吸暂停部分，而正常极性上部分显示单个值 54.6 ZAm2。过渡方向熔岩流之前的低古强度值和之后的更高值表明极性反转开始时的常见行为及其后的恢复。但是，不能丢弃稳定 EMF 的孤立记录，其中强度低于同一位置的电流 (83.7 ZAm2)。最后，