Paleomagnetic Recording Efficiency of Sedimentary Magnetic Mineral Inclusions: Implications for Relative Paleointensity Determinations
Paleomagnetic Recording Efficiency of Sedimentary Magnetic Mineral Inclusions: Implications for Relative Paleointensity Determinations
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沉积磁性矿物包裹体的古磁记录效率：对相对古强度测定的影响
DOI：
10.1029/2018jb016859
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发表时间：
2019-07
影响因子：
3.9
通讯作者：
Tauxe Lisa
中科院分区：
文献类型：
--
作者：
Hong Hoabin;Chang Liao;Hayashida Akira;Roberts Andrew P;Heslop David;Paterson Greig A;Kodama Kazuto;Tauxe Lisa
沉积物的相对古强度（RPI）记录通常由复杂的磁性矿物混合物携带，包括碎屑和生物成因的磁性矿物。最近的研究表明，在较大的碎屑硅酸盐颗粒中的磁性包裹体可以对沉积古地磁记录做出重要贡献。然而，很少有人知道的作用，这样的包裹体在沉积古地磁信号记录。我们分析了日本中部近海北太平洋海洋沉积物岩芯MD 01 - 2421的古地磁和矿物磁性数据，以评估磁性包裹体和其他碎屑磁性矿物如何记录沉积古地磁信号。地层间隔丰富的磁性包裹体占主导地位的磁信号与其他间隔进行比较，定量评估其对沉积RPI信号的贡献。MD 01 - 2421岩心的归一化剩磁记录与全球RPI叠加没有明显的相关性，我们将其归因于与其他碎屑磁性矿物相比，磁性包裹体的古地磁记录效率较低。我们还使用来自MD 01 - 2421岩芯的材料，在受控的类地球磁场下对含有磁性包裹体的粒子进行了首次实验室再沉积实验。我们的研究结果证实，这些颗粒可以通过环境磁场排列，但与其他碎屑磁性矿物相比，磁记录效率较低，这与MD 01 - 2421岩心的归一化剩磁数据一致。我们的示范作用的沉积磁性包裹体应该有广泛的适用性，了解沉积古地磁记录。
Sedimentary relative paleointensity (RPI) records are often carried by complex magnetic mineral mixtures, including detrital and biogenic magnetic minerals. Recent studies have demonstrated that magnetic inclusions within larger detrital silicate particles can make significant contributions to sedimentary paleomagnetic records. However, little is known about the role such inclusions play in sedimentary paleomagnetic signal recording. We analyzed paleomagnetic and mineral magnetic data for marine sediment core MD01‐2421 from the North Pacific Ocean, offshore of central Japan, to assess how magnetic inclusions and other detrital magnetic minerals record sedimentary paleomagnetic signals. Stratigraphic intervals in which abundant magnetic inclusions dominate the magnetic signal are compared with other intervals to assess quantitatively their contribution to sedimentary RPI signals. The normalized remanence record from core MD01‐2421 does not correlate clearly with global RPI stacks, which we attribute to a demonstrated lower paleomagnetic recording efficiency of magnetic inclusions compared to other detrital magnetic minerals. We also carried out the first laboratory redeposition experiments under controlled Earth‐like magnetic fields for particles with magnetic inclusions using material from core MD01‐2421. Our results confirm that such particles can be aligned by ambient magnetic fields but with a lower magnetic recording efficiency compared to other detrital magnetic minerals, which is consistent with normalized remanence data from core MD01‐2421. Our demonstration of the role of sedimentary magnetic inclusions should have wide applicability for understanding sedimentary paleomagnetic recording.
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影响因子：
--
作者：
J. Tarduno;R. Cottrell
通讯作者：
J. Tarduno;R. Cottrell
影响因子：
2.8
作者：
M. J. V. Vreumingen
通讯作者：
M. J. V. Vreumingen
影响因子：
3.9
作者：
Toshinori Ueshima;Masanobu Yamamoto;T. Irino;T. Oba;M. Minagawa;H. Narita;M. Murayama
通讯作者：
Toshinori Ueshima;Masanobu Yamamoto;T. Irino;T. Oba;M. Minagawa;H. Narita;M. Murayama
影响因子：
5.3
作者：
Kaushik Katari;L. Tauxe
通讯作者：
Kaushik Katari;L. Tauxe
DOI：
--
发表时间：
2014
期刊：
--
影响因子：
--
作者：
D. Heslop;A. Roberts;R. Hawkins
通讯作者：
D. Heslop;A. Roberts;R. Hawkins