DOI: 10.1016/j.gloplacha.2013.10.005
论文题名: An estimate of post-depositional remanent magnetization lock-in depth in organic rich varved lake sediments
作者: Snowball I. ; Mellström A. ; Ahlstrand E. ; Haltia E. ; Nilsson A. ; Ning W. ; Muscheler R. ; Brauer A.
刊名: Global and Planetary Change
ISSN: 0921-8227
出版年: 2013
卷: 110 起始页码: 264
结束页码: 277
语种: 英语
英文关键词: Lock-in depth
; Paleomagnetic secular variation
; Post-depositional remanent magnetization
; Varves
Scopus关键词: First-order reversal curves
; Lock-in depths
; Natural remanent magnetization
; Paleomagnetic secular variations
; Post-depositional remanent magnetizations
; Relative paleointensity
; Sediment accumulation
; Varves
; Deposition
; Lakes
; Sediments
; Locks (fasteners)
; accumulation rate
; bioturbation
; data set
; depositional environment
; Holocene
; lacustrine deposit
; magnetization
; paleomagnetism
; radiocarbon dating
; secular variation
; surface layer
; varve
; Gyltigesjon
; Halland
; Sweden
英文摘要: We studied the paleomagnetic properties of relatively organic rich, annually laminated (varved) sediments of Holocene age in Gyltigesjön, which is a lake in southern Sweden. An age-depth model was based on a regional lead pollution isochron and Bayesian modelling of radiocarbon ages of bulk sediments and terrestrial macrofossils, which included a radiocarbon wiggle-matched series of 873 varves that accumulated between 3000 and 2000 Cal a BP (Mellström et al., 2013). Mineral magnetic data and first order reversal curves suggest that the natural remanent magnetization is carried by stable single-domain grains of magnetite, probably of magnetosomal origin. Discrete samples taken from overlapping piston cores were used to produce smoothed paleomagnetic secular variation (inclination and declination) and relative paleointensity data sets. Alternative temporal trends in the paleomagnetic data were obtained by correcting for paleomagnetic lock-in depths between 0 and 70. cm and taking into account changes in sediment accumulation rate. These temporal trends were regressed against reference curves for the same region (FENNOSTACK and FENNORPIS; Snowball et al., 2007). The best statistical matches to the reference curves are obtained when we apply lock-in depths of 21-34. cm to the Gyltigesjön paleomagnetic data, although these are most likely minimum estimates. Our study suggests that a significant paleomagnetic lock-in depth can affect the acquisition of post-depositional remanent magnetization even where bioturbation is absent and no mixed sediment surface layer exists. © 2013 The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888847647&doi=10.1016%2fj.gloplacha.2013.10.005&partnerID=40&md5=1a08bdafeafdf8e6df4a8e11c6bf5d74
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11133
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Earth Sciences - Geophysics, Uppsala University, Villavägen 16, SE-752 36 Uppsala, Sweden
Recommended Citation:
Snowball I.,Mellström A.,Ahlstrand E.,et al. An estimate of post-depositional remanent magnetization lock-in depth in organic rich varved lake sediments[J]. Global and Planetary Change,2013-01-01,110.