DOI: 10.1016/j.quascirev.2014.03.008
Scopus记录号: 2-s2.0-85027957989
论文题名: A deglacial palaeomagnetic master curve for Fennoscandia - Providing a dating template and supporting millennial-scale geomagnetic field patterns for the past 14ka
作者: Lougheed B.C. ; Nilsson A. ; Björck S. ; Snowball I. ; Muscheler R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 106 起始页码: 155
结束页码: 166
语种: 英语
英文关键词: Baltic Sea
; Cyclicity
; Deglacial
; Dipole tilt
; Fennoscandia
; Geomagnetic field
; Master curve
; Northern Europe
; Palaeomagnetic secular variation
; PSV
Scopus关键词: Geochronology
; Sediments
; Baltic sea
; Cyclicity
; Deglacial
; Dipole tilt
; Fennoscandia
; Geomagnetic fields
; Master curve
; Northern Europe
; Palaeomagnetic secular variations
; PSV
; Geomagnetism
; dating method
; deglaciation
; geochronology
; geomagnetism
; Holocene
; paleomagnetism
; sediment core
; Atlantic Ocean
; Baltic Sea
; Russian Federation
; Scandinavia
; Sweden
英文摘要: Reconstructions of palaeomagnetic secular variation (PSV) in sediment cores can be compared to well-dated regional PSV master curves to infer deposition age. The existing PSV master curve for Fennoscandia, "Fennostack" (Snowball etal., 2007), is limited to the past 10ka. In this study, we construct a deglacial (for the interval 14-11ka) PSV master curve for Fennoscandia by including data from a number of existing studies in the region, updating geochronologies where necessary. We also produce new deglacial PSV data from Baltic Sea long-core sediments. By selecting three suitable sites, one in southern Sweden and two in northwest Russia, we produce, for the first time, a deglacial PSV master curve for Fennoscandia, which will provide a useful alternative dating tool for deglacial time intervals, especially considering that deglacial sediments are often unsuitable for 14C dating. Additionally, we use the deglacial PSV master curve to assess current hypotheses regarding geomagnetic field changes. Time varying geomagnetic field models constrained by Holocene PSV data from around the globe have predicted the presence of latitudinal and longitudinal patterns in the position of the north geomagnetic pole (NGP). Specifically, a 1350 year cycle in NGP latitude has been noted, along with two preferred dominant mode longitudinal bands for NGP; in Europe and North America (Korte etal., 2011; Nilsson etal., 2011). Most PSV studies of sediment are, however, limited to the Holocene epoch. By combining our deglacial PSV master curve with 'Fennostack', we are able to assess general patterns in inclination for the past 14ka, and compare these to a general prediction of regional inclination for the last 14ka, based on an extrapolation of the latitudinal and longitudinal NGP periodicity noted by Nilsson etal. (2011). The model prediction suggests that the Fennoscandian PSV for the past 14ka should reveal three recurring intervals of generally steeper inclination due to a dominant NGP longitudinal band in Europe. We find that the Fennoscandian PSV does indeed show these intervals of generally steeper inclination for the time periods expected, supporting the hypothesised periodic NGP variation, which may represent an inherent feature of the geodynamo. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60097
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, Lund University, Sölvegatan 12, Lund, Sweden; School of Environmental Sciences, University of Liverpool, Oliver Lodge Building, Oxford Street, Liverpool, United Kingdom; Department of Earth Sciences - Geophysics, Uppsala University, Villavägen 16, Uppsala, Sweden
Recommended Citation:
Lougheed B.C.,Nilsson A.,Björck S.,et al. A deglacial palaeomagnetic master curve for Fennoscandia - Providing a dating template and supporting millennial-scale geomagnetic field patterns for the past 14ka[J]. Quaternary Science Reviews,2014-01-01,106