Publications

2020
Shaar R, Bechar S, Finkelstein I, Gallet Y, Martin MAS, Ebert Y, Keinan J, Gonen L. Synchronizing geomagnetic field intensity records in the Levant between the 23rd and 15th centuries BCE: chronological and methodological implications. Geochemistry, Geophysics, Geosystems [Internet]. 2020 :e2020GC009251. Publisher's Version
Ebert Y, Shaar R, Levy EJ, Zhao X, Roberts AP, Stein M. Magnetic properties of late Holocene Dead Sea sediments as a monitor of regional hydroclimate. Geochemistry, Geophysics, Geosystems [Internet]. 2020 :e2020GC009176. Publisher's Version
Vaknin Y, Shaar R, Gadot Y, Shalev Y, Lipschits O, Ben-Yosef E. The Earth’s magnetic field in Jerusalem during the Babylonian destruction: A unique reference for field behavior and an anchor for archaeomagnetic dating. PloS one [Internet]. 2020;15 (8) :e0237029. Publisher's Version
Amiel N, Shaar R, Sivan O. The effect of early diagenesis in methanic sediments on sedimentary magnetic properties: Case study from the SE Mediterranean continental shelf. Frontiers in Earth Science [Internet]. 2020;8 :283. Publisher's Version
Grossman Y, Aharonson O, Shaar R, Kletetschka G. Experimental determination of remanent magnetism of dusty ice deposits. Earth and Planetary Science Letters [Internet]. 2020;545 :116408. Publisher's Version
2019
Shemer M, Crouvi O, Shaar R, Ebert Y, Matmon A, Horwitz LK, Eisenmann V, Enzel Y, Barzilai O, Team ASTER, et al. Geochronology, paleogeography, and archaeology of the Acheulian locality of ‘Evron Landfill in the western Galilee, Israel. Quaternary Research. 2019;91 (2) :729–750.
Behar N, Shaar R, Tauxe L, Asefaw H, Ebert Y, Heimann A, Koppers AAP, Ron H. Paleomagnetism and paleosecular variations from the Plio-Pleistocene Golan Heights volcanic plateau, Israel. Geochemistry, Geophysics, Geosystems. 2019.
Zeigen C, Shaar R, Ebert Y, Hovers E. Archaeomagnetism of burnt cherts and hearths from Middle Palaeolithic Amud Cave, Israel: Tools for reconstructing site formations processes and occupation history. Journal of Archaeological Science. 2019;107 :71–86.
2018
Stillinger MD, Feinberg J, Ben-Yosef E, Shaar, R., Hardin JW, Blakely JA. A Rejoinder on the Value of Archaeomagnetic Dating: Integrative Methodology Is the Key to Addressing Levantine Iron Age Chronology. Near Eastern Archaeology [Internet]. 2018;81 (2) :141–144. Publisher's Version
Shaar R, Hassul E, Raphael K, Ebert Y, Segal, Y, Eden I, Vaknin Y, S. M, Nowaczyk N, Chauvin A, et al. The First Catalog of Archaeomagnetic Directions From Israel With 4,000 Years of Geomagnetic Secular Variations. Frontiers in Earth Sciences [Internet]. 2018;164. Publisher's Version
Ebert Y, Shaar R, Emmanuel S, Nowaczyk N, Stein M. Overwriting of sedimentary magnetism by bacterially mediated mineral alteration. geology [Internet]. 2018;46 (4) :291-294. Publisher's Version
Shahack-Gross R, Shaar R, Hassul E, Ebert Y, Forget M, Nowaczyk N, Marco S, Finkelstein I, Agnon A. Fire and collapse: Untangling the formation of destruction layers using archeomagnetism. Geoarchaeology [Internet]. 2018;33 :513-528. Publisher's Version
2017
Farchi E, Ebert Y, Farfurnik D, Haim G, Shaar R, Bar-Gill N. Quantitative vectorial magnetic imaging of multi domain rock forming minerals using nitrogen-vacancy centers in diamond. Spin [Internet]. 2017;7 (3). Publisher's Version
Shaar R, Tauxe L, Goguitchaichvili A, Devidze M, Licheli V. Further evidence of the Levantine Iron Age geomagnetic anomaly from Georgian pottery. Geophysical Research Letters [Internet]. 2017;44. Publisher's Version
Ben-Yosef E, Milman M, Shaar R, Tauxe L, Lipschits O. Six centuries of geomagnetic intensity variations recorded by royal Judean stamped jar handles. Proceedings of the National Academy of Sciences [Internet]. 2017. Publisher's Version
Shaar R, Tauxe L, Ron H, Agnon A, Ebert Y, Finkelstein I. The Tel Megiddo paleointensity project: toward a high resolution reference curve for archaeomagnetic dating. In: Megiddo VI. Tel Aviv: Tel-Aviv University ; 2017. shaar_etal_megiddo_vi.pdf
Shaar R, Ben-Yosef E. paleomagnetic geochronology of Quaternary sequences in the Levant. In: Quaternary Environments, Climate Change, and Humans in the Levant. ; 2017. paleomagnetic_quaternary_levant_4_0_withfigures.pdf
2016
Tauxe L, Shaar R, Jonestrask L, Swanson‐Hysell NL, Minnett R, Koppers AAP, Constable CG, Jarboe N, Gaastra K. PmagPy: Software package for paleomagnetic data analysis and a bridge to the Magnetics Information Consortium (MagIC) Database." Geochemistry, Geophysics, Geosystems (2016). eochemistry, Geophysics, Geosystems [Internet]. 2016. Publisher's Version
Shaar R, Tauxe L, Ron H, Ebert Y, Zuckerman S, Finkelstein I, Agnon A. Large geomagnetic field anomalies revealed in Bronze to Iron Age archeomagnetic data from Tel Megiddo and Tel Hazor, Israel. Earth and Planetray Science Letters [Internet]. 2016;442 :173-85. Publisher's Version
2015
Shaar R, Tauxe L. Instability of thermoremanence and the problem of estimating the ancient geomagnetic field strength from non-single-domain recorders. Proceedings of the National Academy of Sciences of the United States of America [Internet]. 2015. Publisher's VersionAbstract

Data on the past intensity of Earth’s magnetic field (paleointensity) are essential for understanding Earth’s deep interior, climatic modeling, and geochronology applications, among other items. Here we demonstrate the possibility that much of available paleointensity data could be biased by instability of thermoremanent magnetization (TRM) associated with non-single-domain (SD) particles. Paleointensity data are derived from experiments in which an ancient TRM, acquired in an unknown field, is replaced by a laboratory-controlled TRM. This procedure is built on the assumption that the process of ancient TRM acquisition is entirely reproducible in the laboratory. Here we show experimental results violating this assumption in a manner not expected from standard theory. We show that the demagnetization−remagnetization relationship of non-SD specimens that were kept in a controlled field for only 2 y show a small but systematic bias relative to sister specimens that were given a fresh TRM. This effect, likely caused by irreversible changes in micromagnetic structures, leads to a bias in paleointensity estimates.

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