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自布容/松山界限以来与地磁偶极矩变化相关的宇宙成因核素产生的自生铍/铍比率特征。

Authigenic Be/Be ratio signatures of the cosmogenic nuclide production linked to geomagnetic dipole moment variation since the Brunhes/Matuyama boundary.

作者信息

Simon Quentin, Thouveny Nicolas, Bourlès Didier L, Valet Jean-Pierre, Bassinot Franck, Ménabréaz Lucie, Guillou Valéry, Choy Sandrine, Beaufort Luc

机构信息

CEREGE UM34, Aix-Marseille Université, CNRS, IRD, Collège de France Aix-en-Provence France; IPGP, Sorbonne Paris-Cité, Université Paris Diderot, UMR 7154, CNRS Paris France.

CEREGE UM34, Aix-Marseille Université, CNRS, IRD, Collège de France Aix-en-Provence France.

出版信息

J Geophys Res Solid Earth. 2016 Nov;121(11):7716-7741. doi: 10.1002/2016JB013335. Epub 2016 Nov 14.

DOI:10.1002/2016JB013335
PMID:28163989
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5256419/
Abstract

Geomagnetic dipole moment variations associated with polarity reversals and excursions are expressed by large changes of the cosmogenic nuclide beryllium-10 (Be) production rates. Authigenic Be/Be ratios (proxy of atmospheric Be production) from oceanic cores therefore complete the classical information derived from relative paleointensity (RPI) records. This study presents new authigenic Be/Be ratio results obtained from cores MD05-2920 and MD05-2930 collected in the west equatorial Pacific Ocean. Be ratios from cores MD05-2920, MD05-2930 and MD90-0961 have been stacked and averaged. Variations of the authigenic Be/Be ratio are analyzed and compared with the geomagnetic dipole low series reported from global RPI stacks. The largest Be overproduction episodes are related to dipole field collapses (below a threshold of 2 × 10 Am) associated with the Brunhes/Matuyama reversal, the Laschamp (41 ka) excursion, and the Iceland Basin event (190 ka). Other significant Be production peaks are correlated to geomagnetic excursions reported in literature. The record was then calibrated by using absolute dipole moment values drawn from the Geomagia and Pint paleointensity value databases. The Be-derived geomagnetic dipole moment record, independent from sedimentary paleomagnetic data, covers the Brunhes-Matuyama transition and the whole Brunhes Chron. It provides new and complementary data on the amplitude and timing of millennial-scale geomagnetic dipole moment variations and particularly on dipole moment collapses triggering polarity instabilities.

摘要

与极性反转和偏移相关的地磁偶极矩变化通过宇宙成因核素铍 - 10（Be）产生率的大幅变化来体现。因此，来自海洋岩芯的自生Be/Be比值（大气Be产生的代理指标）完善了从相对古强度（RPI）记录中获得的经典信息。本研究展示了从赤道西太平洋采集的MD05 - 2920和MD05 - 2930岩芯获得的新的自生Be/Be比值结果。已对MD05 - 2920、MD05 - 2930和MD90 - 0961岩芯的Be比值进行了叠加和平均。分析了自生Be/Be比值的变化，并与全球RPI叠加报告的地磁偶极低序列进行了比较。最大的Be过量产生事件与布容/松山极性反转、拉尚（41 ka）偏移和冰岛盆地事件（190 ka）相关的偶极场崩溃（低于2×10 Am的阈值）有关。其他显著的Be产生峰值与文献中报道的地磁偏移相关。然后通过使用从Geomagia和Pint古强度值数据库中提取的绝对偶极矩值对记录进行了校准。源自Be的地磁偶极矩记录独立于沉积古地磁数据，涵盖了布容 - 松山极性转换以及整个布容期。它提供了关于千年尺度地磁偶极矩变化的幅度和时间，特别是关于触发极性不稳定的偶极矩崩溃的新的补充数据。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/7c8e2b0258a9/JGRB-121-7716-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/4595423f59e6/JGRB-121-7716-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/b535f77d680e/JGRB-121-7716-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/7478bb5f0248/JGRB-121-7716-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/b1b59d38f1c4/JGRB-121-7716-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/0f7b5dea90a6/JGRB-121-7716-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/6c5112ea1eba/JGRB-121-7716-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/2650f2eb482f/JGRB-121-7716-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/5a27e2d2ffc1/JGRB-121-7716-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/c4eeceb8e92d/JGRB-121-7716-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/7c8e2b0258a9/JGRB-121-7716-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/4595423f59e6/JGRB-121-7716-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/b535f77d680e/JGRB-121-7716-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/7478bb5f0248/JGRB-121-7716-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/b1b59d38f1c4/JGRB-121-7716-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/0f7b5dea90a6/JGRB-121-7716-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/6c5112ea1eba/JGRB-121-7716-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/2650f2eb482f/JGRB-121-7716-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/5a27e2d2ffc1/JGRB-121-7716-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/c4eeceb8e92d/JGRB-121-7716-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be76/5256419/7c8e2b0258a9/JGRB-121-7716-g010.jpg

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