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    188宝金博页面版: Weak palaeointensity results over a Pliocene volcanic sequence from Lesser Caucasus (Georgia)

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    内容提示： 1 Weak paleointensity results over a Pliocene volcanic sequence from Lesser Caucasus 2 (Georgia): Transitional record or time averaged field?34 Elisa M. Sánchez-Moreno 1,* , Manuel Calvo-Rathert 1,2 , Avto Goguitchaichvili 3 , Lisa 5 Tauxe 4 , George T. Vashakidze 5 , Vladimir A. Lebedev 6 671 Departamento de Física, EPS Campus Rio Vena – Universidad de Burgos, Av. Cantabria, 8 s/n, 09006 Burgos, Spain.92 Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, 10 Honolulu, HI, Un...

    文档格式：PDF | 页数：41 | 浏览次数：11 | 上传日期：2020-10-08 14:26:30 | 文档星级：
    1 Weak paleointensity results over a Pliocene volcanic sequence from Lesser Caucasus 2 (Georgia): Transitional record or time averaged field?34 Elisa M. Sánchez-Moreno 1,* , Manuel Calvo-Rathert 1,2 , Avto Goguitchaichvili 3 , Lisa 5 Tauxe 4 , George T. Vashakidze 5 , Vladimir A. Lebedev 6 671 Departamento de Física, EPS Campus Rio Vena – Universidad de Burgos, Av. Cantabria, 8 s/n, 09006 Burgos, Spain.92 Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, 10 Honolulu, HI, United States113 Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica Unidad 12 Michoacán, UNAM – Campus Morelia, 58990 Morelia, México.134 Scripps Institution of Oceanography, University of California - San Diego, La Jolla, CA 14 92093-0220, USA.155 Alexandre Janelidze Institute of Geology – Ivane Javakhishvili Tbilisi State University, 16 1/9 M. Alexidze str., 0171 Tbilisi, Georgia.176 Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry – 18 Russian Academy of Sciences (IGEM RAS), Staromonetny per., 35, 119017 Moscow, 19 Russia.2021 *Corresponding author, Elisa M. Sánchez-Moreno: emsanchez@ubu.es2223 Key words: Paleointensity; lava flow sequence; Pliocene; transitional record; weak time-24 averaged field2526 Abstract2728 A paleointensity study has been carried out on a Pliocene sequence of 20 consecutive 29 lava flows where previous directional results seem to reflect anomalous behavior of the 30 Earth’s magnetic field (EMF), which can be explained by a polarity transition record or 31 non-averaged paleosecular variation or both. Here, we perform a total of 55 32 paleointensity determinations using the original Thellier-Thellier method and 100 with 33 the IZZI method. We assess the performance of our selection criteria using a set of strict 34 threshold values applied to a set of test data whose TRMs were acquired in known fields. 35 Absolute paleointensity determinations that passed our selection criteria were obtained 36 on four specimens with the Thellier-Thellier method and on 41 specimens with the IZZI 37 method. Application of reliability criteria at a site level yielded paleointensity results in 38 eight of 20 studied lava flows. We obtained median values of VADM between 28.9 and 39 45.6 ZAm 2 for the reverse polarity lower Apnia section, while the normal polarity upper 40 section displayed a single value of 54.6 ZAm 2 . The low paleointensity values before a 41 transitional direction lava flow and the higher value after it, suggest the common Page 1 of 41 Geophysical Journal International123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960

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