首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >Authigenic 10Be/9Be ratio signatures of the cosmogenic nuclide production linked to geomagnetic dipole moment variation since the Brunhes/Matuyama boundary
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Authigenic 10Be/9Be ratio signatures of the cosmogenic nuclide production linked to geomagnetic dipole moment variation since the Brunhes/Matuyama boundary

机译:自Brunhes / Matuyama边界以来与宇宙磁偶极矩变化有关的宇宙成因核素生产的自生10Be / 9Be比率特征

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摘要

Geomagnetic dipole moment variations associated with polarity reversals and excursions are expressed by large changes of the cosmogenic nuclide beryllium‐10 (10Be) production rates. Authigenic 10Be/9Be ratios (proxy of atmospheric 10Be production) from oceanic cores therefore complete the classical information derived from relative paleointensity (RPI) records. This study presents new authigenic 10Be/9Be 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 10Be/9Be ratio are analyzed and compared with the geomagnetic dipole low series reported from global RPI stacks. The largest 10Be overproduction episodes are related to dipole field collapses (below a threshold of 2 × 1022 Am2) associated with the Brunhes/Matuyama reversal, the Laschamp (41 ka) excursion, and the Iceland Basin event (190 ka). Other significant 10Be 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 10Be‐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.
机译:与地球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( 10 Be)生产率的大变化来表示。来自海洋核心的自生 10 Be / 9 Be比(大气 10 Be生产的代理)因此完成了源自相对古强度(RPI)的经典信息) 记录。这项研究提出了从赤道西太平洋收集的MD05‐2920和MD05‐2930岩心获得的新的自生 10 Be / 9 Be比值结果。将MD05‐2920,MD05‐2930和MD90‐0961磁芯的比率相加并取平均值。分析了自生的 10 Be / 9 Be比值的变化,并与全球RPI烟囱报道的地磁偶极子低序列进行了比较。最多的 10 Be生产过剩事件与偶极子场塌陷有关(低于2×10 22 Am 2 )/ Matuyama逆转,Laschamp(41 ka)游览和冰岛盆地事件(190 ka)。其他显着的 10 Be生产峰与文献中报道的地磁偏移有关。然后使用从Geomagia和Pint古强度值数据库中得出的绝对偶极矩值对记录进行校准。 10 地磁偶极矩记录与沉积古磁数据无关,涵盖了Brunhes-Matuyama过渡带和整个Brunhes Chron。它提供了有关千年级地磁偶极矩变化幅度和时间的新的补充数据,尤其是有关偶极矩坍缩触发极性不稳定性的数据。

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