DOI: 10.1016/j.epsl.2018.04.014
Scopus记录号: 2-s2.0-85045379150
论文题名: A 20–15 ka high-resolution paleomagnetic secular variation record from Black Sea sediments – no evidence for the ‘Hilina Pali excursion’?
作者: Liu J. ; Nowaczyk N.R. ; Frank U. ; Arz H.W.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492 起始页码: 174
结束页码: 185
语种: 英语
英文关键词: Black Sea
; geomagnetic excursion
; Hilina Pali excursion
; paleosecular variation
; relative paleointensity
Scopus关键词: Clocks
; Geomagnetism
; Hematite
; Stratigraphy
; Black sea
; Geomagnetic excursions
; Hilina Pali excursion
; Paleosecular variations
; Relative paleointensity
; Sediments
; lava flow
; magnetostratigraphy
; marine sediment
; paleomagnetism
; secular variation
; sedimentation rate
; tephrochronology
; X-ray fluorescence
; Alaska
; Arctic
; Arctic Ocean
; Black Sea
; Canada
; Siberia
; Svalbard
; Svalbard and Jan Mayen
; United States
英文摘要: A comprehensive magnetostratigraphic investigation on sixteen sediment cores from the southeastern Black Sea yielded a very detailed high-quality paleosecular variation (PSV) record spanning from 20 to 15 ka. The age models are based on radiocarbon dating, stratigraphic correlation, and tephrochronology. Further age constraints were obtained by correlating four meltwater events, described from the western Black Sea, ranging in age from about 17 to 15 ka, with maxima in K/Ti ratios, obtained from X-ray fluorescence (XRF) scanning, and minima in S-ratios, reflecting increased hematite content, in the studied cores. Since the sedimentation rates in the investigated time window are up to 50 cm ka−1, the obtained PSVs records enabled a stacking using 50-yr bins. A directional anomaly at 18.5 ka, associated with pronounced swings in inclination and declination, as well as a low in relative paleointensity (rPI), is probably contemporaneous with the Hilina Pali excursion, originally reported from Hawaiian lava flows. However, virtual geomagnetic poles (VGPs) calculated from Black Sea sediments are not located at latitudes lower than 60°N, which denotes normal, though pronounced secular variations. During the postulated Hilina Pali excursion, the VGPs calculated from Black Sea data migrated clockwise only along the coasts of the Arctic Ocean from NE Canada (20.0 ka), via Alaska (18.6 ka) and NE Siberia (18.0 ka) to Svalbard (17.0 ka), then looping clockwise through the Eastern Arctic Ocean. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109888
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 5.2 – Paleoclimate and Landscape evolution, Potsdam, 14473, Germany; Leibnitz Institute for Baltic Sea Research Warnemünde, Rostock, 18119, Germany
Recommended Citation:
Liu J.,Nowaczyk N.R.,Frank U.,et al. A 20–15 ka high-resolution paleomagnetic secular variation record from Black Sea sediments – no evidence for the ‘Hilina Pali excursion’?[J]. Earth and Planetary Science Letters,2018-01-01,492