DOI: 10.1002/2014GL059439
论文题名: Geomagnetic field excursion recorded 17ka at Tianchi Volcano, China: New 40Ar/39Ar age and significance
作者: Singer B.S. ; Jicha B.R. ; He H. ; Zhu R.
刊名: Geophysical Research Letters
ISSN: 0094-10149
EISSN: 1944-9880
出版年: 2014
卷: 41, 期: 8 起始页码: 2794
结束页码: 2802
语种: 英语
英文关键词: China
; geochronology
; Geodynamo
; volcano
Scopus关键词: Geochronology
; Geomagnetism
; Glacial geology
; China
; Deglaciations
; Geodynamo
; Geomagnetic excursions
; Geomagnetic fields
; Global feature
; Paleointensity
; Tianchi volcanos
; Volcanoes
; argon-argon dating
; geochronology
; geodynamo
; geomagnetic field
; Last Glacial Maximum
; lava
; volcanic eruption
; Baekdu Mountain
; Changbai Mountains
英文摘要: New 40Ar/39Ar dating of a comenditic lava atop Tianchi Volcano, China, indicates eruption at 17.1±0.9ka. The flow interior records a pair of transitional virtual geomagnetic poles and a low paleointensity of ~25μT. Thus, it records a geomagnetic field excursion that is younger than the 41ka Laschamp or 32ka Auckland excursions. Implications are: (1) following a repose of several tens of kyr, Tianchi Volcano became highly active immediately following termination of the last glaciation maximum. The flare-up of silicic eruptions may reflect rapid deglaciation of the edifice. (2) A 17ka age for the Tianchi excursion provides the first direct radioisotopic evidence that excursional behavior, which is imprecisely dated and less well documented magnetically at several other sites, is a global feature of geodynamo behavior. (3) During the Brunhes chron, 13 well-dated excursions cluster into two periods, including seven between 17 and 212ka, and six between about 530 and 730ka. Key Points Ar dating at Tianchi Volcano, China reveals a geomagnetic excursion at 17 ka The Tianchi excursion is the youngest of 13 in the Brunhes chron We highlight a possible volcanic flare-up upon deglaciation of Tianchi Volcano ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898762222&doi=10.1002%2f2014GL059439&partnerID=40&md5=82afda6ff98f149a9b133212d39e8030
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7413
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States
Recommended Citation:
Singer B.S.,Jicha B.R.,He H.,et al. Geomagnetic field excursion recorded 17ka at Tianchi Volcano, China: New 40Ar/39Ar age and significance[J]. Geophysical Research Letters,2014-01-01,41(8).