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New criteria for selecting reliable Thellier-type paleointensity results from the 1960 Kilauea lava flows, Hawaii
Earth, Planets and Space ( IF 3.0 ) Pub Date : 2021-07-16 , DOI: 10.1186/s40623-021-01473-6
Doohee Jeong 1 , Qingsong Liu 1, 2 , Yuhji Yamamoto 3 , Yongjae Yu 4 , Xiang Zhao 5 , Huafeng Qin 6
Affiliation  

Thellier-type paleointensity experiments associated with partial thermal remanent magnetization checks have been widely used to determine paleointensity values from volcanic and archaeological media. However, previous studies have revealed that a substantial portion of paleointensity results with positive checks for historical lava samples largely fails to predict known Earth magnetic field intensity values. To determine the fidelity of paleointensity values, conventional Thellier-type paleointensity experiments were performed on Kilauea lava flows that erupted in 1960. The positive partial thermal remanent magnetization checks for our results range from 30.28 ± 1.38 µT to 52.94 ± 1.89 µT. This strongly indicates that conventional paleointensity checks cannot guarantee the fidelity of paleointensity results, especially when the unblocking temperatures for the newly formed magnetic particles are higher than the treatment temperature. Therefore, in this study, to check for thermal alteration during heating, the temperature dependence of the hysteresis parameter measured at room temperature for the thermally treated samples was also measured. Our new results show that nearly all biased paleointensity values correspond to a ratio of the coercivity of remanence to the magnetic coercivity of > 3 and a chemical alteration index > ~ 10%, which indicates the strong effect of the domain state and thermal alteration on the fidelity of the paleointensity results. Our study provides feasible criteria to further improve the fidelity of paleointensity estimations.



中文翻译:

从 1960 年夏威夷基拉韦厄熔岩流中选择可靠的 Thellier 型古强度结果的新标准

与部分热剩磁检查相关的 Thellier 型古强度实验已被广泛用于确定来自火山和考古介质的古强度值。然而,先前的研究表明,对历史熔岩样本进行阳性检查的大部分古强度结果在很大程度上无法预测已知的地球磁场强度值。为了确定古强度值的保真度,对 1960 年喷发的基拉韦厄熔岩流进行了传统的 Thellier 型古强度实验。我们结果的正部分热剩磁检查范围从 30.28 ± 1.38 µT 到 52.94 ± 1.89 µT。这有力地表明,传统的古强度检查不能保证古强度结果的保真度,特别是当新形成的磁性颗粒的解阻塞温度高于处理温度时。因此,在本研究中,为了检查加热过程中的热变化,还测量了在室温下测量的热处理样品的滞后参数的温度依赖性。我们的新结果表明,几乎所有有偏差的古强度值都对应于剩磁矫顽力与矫顽力之比 > 3 和化学蚀变指数 > ~ 10%,这表明畴态和热蚀变对古强度结果的保真度。我们的研究为进一步提高古强度估计的保真度提供了可行的标准。在这项研究中,为了检查加热过程中的热变化,还测量了在室温下测量的热处理样品的滞后参数的温度依赖性。我们的新结果表明,几乎所有有偏差的古强度值都对应于剩磁矫顽力与矫顽力之比 > 3 和化学蚀变指数 > ~ 10%,这表明畴态和热蚀变对古强度结果的保真度。我们的研究为进一步提高古强度估计的保真度提供了可行的标准。在这项研究中,为了检查加热过程中的热变化,还测量了在室温下测量的热处理样品的滞后参数的温度依赖性。我们的新结果表明,几乎所有有偏差的古强度值都对应于剩磁矫顽力与磁矫顽力之比 > 3 和化学蚀变指数 > ~ 10%,这表明畴态和热蚀变对古强度结果的保真度。我们的研究为进一步提高古强度估计的保真度提供了可行的标准。我们的新结果表明,几乎所有有偏差的古强度值都对应于剩磁矫顽力与磁矫顽力之比 > 3 和化学蚀变指数 > ~ 10%,这表明畴态和热蚀变对古强度结果的保真度。我们的研究为进一步提高古强度估计的保真度提供了可行的标准。我们的新结果表明,几乎所有有偏差的古强度值都对应于剩磁矫顽力与矫顽力之比 > 3 和化学蚀变指数 > ~ 10%,这表明畴态和热蚀变对古强度结果的保真度。我们的研究为进一步提高古强度估计的保真度提供了可行的标准。

更新日期:2021-07-16
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