气候变化领域集成服务门户(CCPortal): Four-Dimensional Paleomagnetic Dataset: Plio-Pleistocene Paleodirection and Paleointensity Results From the Erebus Volcanic Province, Antarctica

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DOI	10.1029/2020JB020834
	Four-Dimensional Paleomagnetic Dataset: Plio-Pleistocene Paleodirection and Paleointensity Results From the Erebus Volcanic Province, Antarctica
	Asefaw H.; Tauxe L.; Koppers A.A.P.; Staudigel H.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	A fundamental assumption in paleomagnetism is that a geocentric axial dipole (GAD) geomagnetic field structure extends to the ancient field. Global paleodirectional compilations that span 0–5-million year support a GAD dominated field structure with minor non-GAD contributions, however, the paleointensity data over the same period do not. In a GAD field, higher latitudes should preserve higher intensity, but the current database suggests that intensities are independent of latitude. To determine whether the seemingly “low” intensities from Antarctica reflect the ancient field, rather than low-quality data or inadequate temporal sampling, we have conducted a new study of the paleomagnetic field in Antarctica. This study focuses on the paleomagnetic field structure over the Plio-Pleistocene. We combine and reanalyze new and published paleodirectional and paleointensity results from the Erebus volcanic province to recover paleodirections from 98 sites that were both thermally and alternating field demagnetized and then subjected to a set of strict selection criteria and paleointensities from 26 sites from the Plio-Pleistocene that underwent the IZZI modified Thellier-Thellier experiment and were also subjected to a strict set of selection criteria. The paleopole (201.85°, 87.65°) and α95 (5.51°) recovered from our paleodirectional study supports the GAD hypothesis and the scatter of the virtual geomagnetic poles falls within the uncertainty of that predicted by TK03 paleosecular variation model. Our time-averaged field strength estimate, 33.57 ± 2.71 μT, is significantly weaker than that expected from a GAD field estimated by the present field. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	geomagnetism; paleointensity; paleointensity; paleomagnetism; paleosecular variation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187379
作者单位	Geosciences Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
推荐引用方式 GB/T 7714	Asefaw H.,Tauxe L.,Koppers A.A.P.,et al. Four-Dimensional Paleomagnetic Dataset: Plio-Pleistocene Paleodirection and Paleointensity Results From the Erebus Volcanic Province, Antarctica[J],2021,126(2).
APA	Asefaw H.,Tauxe L.,Koppers A.A.P.,&Staudigel H..(2021).Four-Dimensional Paleomagnetic Dataset: Plio-Pleistocene Paleodirection and Paleointensity Results From the Erebus Volcanic Province, Antarctica.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Asefaw H.,et al."Four-Dimensional Paleomagnetic Dataset: Plio-Pleistocene Paleodirection and Paleointensity Results From the Erebus Volcanic Province, Antarctica".Journal of Geophysical Research: Solid Earth 126.2(2021).