| DOI: | 10.1002/2015GL066381
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| 论文题名: | Unblocking temperatures of viscous remanent magnetism in displaced granitic boulders, Icicle Creek glacial moraines (Washington, USA) |
| 作者: | Crider J.G.; Globokar D.M.; Burmester R.F.; Housen B.A.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8287
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| EISSN: | 1944-8018
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| 出版年: | 2015
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| 卷: | 42, 期:24 | | 起始页码: | 10647
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| 结束页码: | 10654
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| 语种: | 英语
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| 英文关键词: | age estimation
; geomorphic dating
; magnetic overprint
; magnetite
; pTVRM
; viscous remanent magnetism
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| Scopus关键词: | Demagnetization
; Glacial geology
; Magnetism
; Magnetite
; Magnetization
; Mergers and acquisitions
; Age estimation
; Geomorphic dating
; Magnetic overprints
; Magnetic remanence
; PTVRM
; Remanent magnetization
; Surface exposure dating
; Washington , USA
; Remanence
; age determination
; boulder
; cosmogenic radionuclide
; demagnetization
; displacement
; granodiorite
; hypothesis testing
; magnetite
; moraine
; overprinting
; remanent magnetization
; rock mechanics
; temperature
; viscosity
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| 英文摘要: | Viscous remanent magnetization (VRM) may partially overprint original magnetization in rocks displaced by geomorphic events. An established theoretical relationship between the time and temperature of acquisition of VRM and the time and temperature of demagnetization suggests that laboratory demagnetization (unblocking) of VRM can be used to estimate the displacement age of rocks. We test this hypothesis at four nested glacial moraines in the Icicle Creek drainage of central Washington, the ages of which were previously determined by cosmogenic surface exposure dating. The moraines are composed primarily of granodiorite boulders, and magnetic remanence is carried dominantly by magnetite. Both the maximum and average pVRM demagnetization temperatures (TD) increase with relative age of the moraines. For the three younger moraines, the average TD yields an age comparable to the cosmogenic age, within uncertainty of pVRM acquisition temperature. Uncertainty in the acquisition and demagnetization temperatures can limit the utility of pVRM for absolute dating. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955211882&doi=10.1002%2f2015GL066381&partnerID=40&md5=9e3a8cb48a92a7bdb5337b8e86ecafe0
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7903
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States
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| Recommended Citation: | |
Crider J.G.,Globokar D.M.,Burmester R.F.,et al. Unblocking temperatures of viscous remanent magnetism in displaced granitic boulders, Icicle Creek glacial moraines (Washington, USA)[J]. Geophysical Research Letters,2015-01-01,42(24).
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