来自大洋钻探计划 1233 号站点(MIS 1-4;0-71 ka)的高分辨率 U 沟道古地磁时序变化和磁场偏移

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Steve P. Lund , Joseph S. Stoner , James E.T. Channell
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引用次数: 0

摘要

本文介绍了 ODP 1233 号站点(智利边缘)过去 70 千年的 U 沟道古地磁时变(PSV)新数据。这是迄今为止分辨率最高的长期 PSV 记录。U 沟道研究对自然剩磁(NRM)进行了详细的消磁,并为每个取样层开发了特征剩磁(ChRM - 最终 PSV 方向)。U-channel 岩石磁性研究利用消磁法测量了磁感应强度和滞回剩磁(ARM),并利用它们对自然剩磁进行了归一化处理,从而形成了新的、详细的相对古强度记录。古地磁记录包含三个偏移:莫诺湖偏移、拉斯汉普偏移和格陵兰/挪威海偏移。这些偏移的名义采样间隔为 5-8 年。莫诺湖考察和格陵兰/挪威海考察的考察方向间隔时间都很短(300 年)。这些偏移与世界其他地区的类似偏移记录明显不同。拉斯汉普偏移显示了局部地区的磁场完全反转,快速(200 年)从反转方向移动到/从反转方向移动,极性方向完全反转的时间长达 500 年。这种模式与世界其他地区的拉斯汉普偏移记录明显不同。我们对 1233 号站点 U-道 PSV 记录进行了统计分析。该分析的显著特点包括:记录显示,该场有 1/3 的时间具有异常大的振幅方向变化(高角度离散性)。这些时间段出现在 25-45 ka 和 55-65 ka。这些时间段的方向变化频率较低(较为缓慢),古强度低于平均水平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-resolution U-channel paleomagnetic secular variation and magnetic field excursions from ocean drilling program site 1233 (MIS 1–4; 0–71 ka)

This paper presents new u-channel paleomagnetic secular variation (PSV) data for ODP Site 1233 (Chile margin) for the last 70 ky. This is the highest-resolution, long-term PSV record ever recovered. The u-channel study has carried out detailed af demagnetization of the natural remanence (NRM) and developed a characteristic remanence (ChRM – final PSV direction) for each sampling horizon. The u-channel rock magnetic studies have measured magnetic susceptibility and anhysteretic remanence (ARM) with af demagnetization and used them to normalize the NRM and develop a new, detailed relative paleointensity record. The paleomagnetic record contains three excursions: the Mono Lake Excursion, the Laschamp Excursion, and the Greenland/Norwegian-Sea Excursion. These excursions have nominal sampling intervals of 5–8 years. Both the Mono Lake and Greenland/Norwegian-Sea Excursions involve short duration intervals of excursional directions (<300 years). The excursions are distinctly different from similar excursion records from other parts of the World. The Laschamp Excursion exhibits a full local reversal of the field with fast (<200 yr) movement to/from reversed directions and ∼ 500 years of full reversed polarity directions. This pattern is distinctly different from Laschamp excursion records from other parts of the World. We have carried out a statistical analysis of the Site 1233 u-channel PSV record. Notable specific features of that analysis include documentation that the field spends >1/3 of its time with anomalously large amplitude directional variability (high angular dispersion). These intervals occur at∼25–45 ka and 55–65 ka. These intervals have lower-frequency (more sluggish) directional variability and are associated with lower than average paleointensity.

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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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