气候变化领域集成服务门户(CCPortal): Timing of Quaternary geomagnetic reversals and excursions in volcanic and sedimentary archives

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DOI	10.1016/j.quascirev.2019.106114
	Timing of Quaternary geomagnetic reversals and excursions in volcanic and sedimentary archives
	Channell J.E.T.; Singer B.S.; Jicha B.R.
发表日期	2020
ISSN	0277-3791
卷号	228
英文摘要	We review the ages of Quaternary magnetic polarity reversals and magnetic excursions. Improvements in radioisotopic 40Ar/39Ar dating of reversals and excursions reflect the use of multi-collector mass spectrometers, along with ultra-low backgrounds, laser-based incremental heating methods, and adoption of 28.201 Ma for the Fish Canyon sanidine (FCs) standard age (Kuiper et al., 2008). These improvements have brought 40Ar/39Ar ages of reversals and excursions into close correspondence with astrochronological ages based on the correlation of δ18O data to LR04 (Lisiecki and Raymo, 2005) and, in a few cases, correlation to ice-core chronologies. Ages of two polarity reversals, the Matuyama-Brunhes boundary and base Olduvai, are at odds with ages given in popular geomagnetic polarity timescales. Sedimentary records of the Laschamp and Iceland Basin excursion are numerous and widespread, and attest to global manifestation and global synchronicity of these excursions. Records of other Quaternary excursions are less numerous. The Blake excursion (∼115 ka) has been recorded in North Atlantic sediments, Chinese loess, Indian Ocean volcanics, and Spanish speleothems. The Santa Rosa excursion (∼932 ka) has been recorded in North Atlantic and Phillipine Basin sediments, as well as in volcanic rocks from New Mexico and Galapagos. The Punaruu excursion (∼1115 ka) has been observed in sediments from the North Atlantic and California Margin as well as in volcanic rocks on Tahiti. Uniformity of individual excursion ages, using astrochronological, 40Ar/39Ar and U–Th methods, argues for synchronous global manifestation of excursions, strengthening the usefulness of magnetic excursions (and reversals) in Quaternary stratigraphy. © 2019 Elsevier Ltd
英文关键词	40Ar/39Ar dating; Astrochronology; Magnetic excursions; Magnetic reversals; Quaternary
语种	英语
scopus关键词	Geomagnetism; Oceanography; Sedimentology; Sediments; Stratigraphy; Timing circuits; Volcanic rocks; Volcanoes; Astrochronology; Magnetic excursions; Magnetic reversal; Quaternary; ^40Ar/^39Ar dating; Magnetic polarity; age determination; argon-argon dating; chronology; geological record; historical record; magnetic reversal; mass spectrometry; Quaternary; radionuclide; sanidine; sedimentary rock; timescale; uranium isotope; volcanic rock; Atlantic Ocean; Atlantic Ocean (North); California Margin; Colorado; Fish Canyon; Guatemala [Central America]; Iceland Basin; Indian Ocean; New Mexico; Pacific Ocean; Santa Rosa; Society Islands; Tahiti; United States; Windward Islands [Society Islands]
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151635
作者单位	Dept. of Geological Sciences, University of Florida, Gainesville, FL 32611, United States; Dept. of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States
推荐引用方式 GB/T 7714	Channell J.E.T.,Singer B.S.,Jicha B.R.. Timing of Quaternary geomagnetic reversals and excursions in volcanic and sedimentary archives[J],2020,228.
APA	Channell J.E.T.,Singer B.S.,&Jicha B.R..(2020).Timing of Quaternary geomagnetic reversals and excursions in volcanic and sedimentary archives.Quaternary Science Reviews,228.
MLA	Channell J.E.T.,et al."Timing of Quaternary geomagnetic reversals and excursions in volcanic and sedimentary archives".Quaternary Science Reviews 228(2020).