DOI: 10.1016/j.epsl.2017.11.021
Scopus记录号: 2-s2.0-85035363425
论文题名: Cosmogenic signature of geomagnetic reversals and excursions from the Réunion event to the Matuyama–Brunhes transition (0.7–2.14 Ma interval)
作者: Simon Q. ; Bourlès D.L. ; Thouveny N. ; Horng C.-S. ; Valet J.-P. ; Bassinot F. ; Choy S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 510
结束页码: 524
语种: 英语
英文关键词: authigenic 10Be/9Be ratios
; Cobb Mountain and Réunion events
; Jaramillo and Olduvai subchrons
; lock-in depth
; Matuyama geomagnetic excursions
; Matuyama–Brunhes transition
Scopus关键词: Dipole moment
; Geochronology
; Locks (fasteners)
; Magnetization
; Stratigraphy
; Absolute paleointensity
; Authigenic
; Cosmogenic radionuclides
; Geomagnetic dipole moment
; Geomagnetic excursions
; Geomagnetic polarity reversal
; Jaramillo and Olduvai subchrons
; Lock-in depths
; Geomagnetism
; beryllium isotope
; cosmogenic radionuclide
; geomagnetic field
; magnetic reversal
; mountain region
; paleomagnetism
; remanent magnetization
; stratigraphy
英文摘要: Long-term variations of the geomagnetic dipole moment (GDM) during periods of stable polarity and in transitional states (reversals and excursions) provide key information for understanding the geodynamo regime. Following several studies dealing with the Brunhes chron and the Matuyama–Brunhes transition, this study presents a new authigenic 10Be/9Be ratio (Be-ratio) record obtained from the MD97-2143 core (western Pacific Ocean). This new Be-ratio series yields a record of GDM variations covering the early Brunhes and mid to late Matuyama time period (i.e. 700–2140 ka), independently from the relative paleointensity (RPI) record obtained from the same core, that can be compared with available RPI records and stacks. Stratigraphic offsets measured between the Be-ratio peaks and the corresponding RPI minima reach 2 to 14 cm. They can be assigned to (post-) detrital remanent magnetization (pDRM) effects leading to magnetization locking-in delays varying from 2 to 12 ka in the studied core. 10Be overproduction episodes triggered by geomagnetic dipole moment lows (GDL) linked to polarity reversals and excursions confirm the global control exerted by the GDM on cosmogenic radionuclides production. A dipole moment reconstruction derived from the Beryllium-10 (BeDiMo) was compiled and calibrated using absolute paleointensity data. This independent record complements the available paleomagnetic RPI records, permitting 1) to overcome the pDRM lock-in offsets induced below the mixing layer, 2) to confront and increase the robustness and precision of GDM reconstructions and, 3) to better constrain the chronology of geomagnetic field instabilities during the mid to late Matuyama chron. Our new 10Be derived inventory is fully compatible with the GDL series linked to geomagnetic polarity reversals and events (Matuyama–Brunhes transition, Jaramillo and Olduvai subchron boundaries, Cobb Mountain, Réunion) and it strengthens the occurrence of several excursions (Kamikatsura, Santa Rosa, Punaruu, Bjorn, Gilsa, Gardar) that were until now reported from only sparse locations. © 2017 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110129
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: Aix-Marseille Université, CNRS, IRD, Coll France, CEREGE UM34, Aix en Provence, 13545, France; IPGP, Université Paris Diderot, Sorbonne Paris-Cité, UMR 7154 CNRS, 1 rue Jussieu, Paris, 75238, France; Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, Taipei, Taiwan; LSCE, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
Recommended Citation:
Simon Q.,Bourlès D.L.,Thouveny N.,et al. Cosmogenic signature of geomagnetic reversals and excursions from the Réunion event to the Matuyama–Brunhes transition (0.7–2.14 Ma interval)[J]. Earth and Planetary Science Letters,2018-01-01,482