Reliability of the paleomagnetic signal recorded in a lava flow erupted on 4 December 2021 in La Palma (Canary Islands, Spain)

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Manuel Calvo-Rathert, Eva Vernet, Josep M Parés, Vicente Soler, Elisa-María Sánchez-Moreno, María-Felicidad Bógalo, Ángel Carrancho, Yuhji Yamamoto, Lidia Rodríguez-Méndez
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Abstract

Summary A basaltic lava flow erupted from the Tajogaite volcano on December 4th, 2021, in La Palma (Canary Islands, Spain) was sampled to find out to what extent reliable and correct information on both intensity and direction of the Earth's magnetic field can be obtained from the paleomagnetic signal recorded in a lava flow which erupted under known conditions. Samples were taken every few centimetres across a flow up to a total of 27 oriented cores. Paleomagnetic experiments showed a strong viscous overprint in many samples. Nevertheless, the mean paleomagnetic direction obtained agrees well with the actual value from IGRF-13. Rock magnetic experiments were performed to obtain additional information about the quality and reliability of the results and the reasons for unsuccessful determinations. Analysis of mostly irreversible thermomagnetic curves showed that the carriers of remanence were magnetite and titanomagnetite of low and/or intermediate Curie-temperature. Hysteresis parameter ratios showed a pronounced variability across the flow. Analyses of frequency dependent susceptibility, IRM acquisition coercivity spectra and FORCs showed a noticeably presence of very low coercivity grains (multidomain and superparamagnetic-single domain boundary). Multimethod paleointensity experiments were performed with the Thellier-Coe, multispecimen and Tsunakawa-Shaw methods. Only three of 25 cores from the flow yielded successful Thellier-Coe determinations, in agreement with the expected field value of 38.7μT (IGRF-13). However, paleointensities of 60% of the specimens agree with the expected value performing an informal analysis without considering criteria thresholds. Four of six Tsunakawa-Shaw determinations performed on samples from the flow yielded correct results, but three multispecimen determinations providing apparently successful determinations largely underestimate the expected field intensity. Combination of three Thellier-Coe and four Tsunakawa-Shaw successful determinations yields a multimethod paleointensity result B = (36.9 ± 2.0) μT in good agreement with the expected field intensity.
2021 年 12 月 4 日在拉帕尔马(西班牙加那利群岛)喷发的熔岩流中记录的古地磁信号的可靠性
摘要 对 2021 年 12 月 4 日从拉帕尔马(西班牙加那利群岛)塔霍加特火山喷发的玄武岩熔岩流进行了取样,以了解从在已知条件下喷发的熔岩流中记录的古地磁信号中能在多大程度上获得有关地球磁场强度和方向的可靠而正确的信息。在整个熔岩流中每隔几厘米取样一次,总共取了 27 个定向岩芯。古地磁实验表明,许多样本都有强烈的粘性覆盖。不过,获得的平均古地磁方向与 IGRF-13 的实际值非常吻合。进行了岩石磁性实验,以获得有关结果质量和可靠性的更多信息,以及未能成功测定的原因。对大部分不可逆热磁曲线的分析表明,剩磁的载体是低和/或中居里温度的磁铁矿和钛磁铁矿。磁滞参数比在整个磁流中表现出明显的差异性。对频率相关电感、IRM 采集矫顽力谱和 FORC 的分析表明,明显存在矫顽力极低的晶粒(多域和超顺磁性-单域边界)。使用 Thellier-Coe、多试样和 Tsunakawa-Shaw 方法进行了多方法古强度实验。流体中的 25 个岩心中只有 3 个成功地进行了 Thellier-Coe 测定,与 38.7μT 的预期场值(IGRF-13)一致。然而,60%的标本的古密度与在不考虑标准阈值的情况下进行非正式分析的预期值一致。在对水流样本进行的六次常川-肖测定中,有四次得出了正确的结果,但三次多标本测定明显成功,在很大程度上低估了预期的现场强度。将三项 Thellier-Coe 测定和四项 Tsunakawa-Shaw 测定成功的结果结合起来,得出的多方法古强度结果 B = (36.9 ± 2.0) μT,与预期的实地强度非常吻合。
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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