俄罗斯北极泰米尔半岛62 ka地磁古强度记录

IF 2.7 Q2 GEOCHEMISTRY & GEOPHYSICS
S. Scheidt, M. Lenz, R. Egli, D. Brill, M. Klug, K. Fabian, M. M. Lenz, R. Gromig, J. Rethemeyer, B. Wagner, Grigory Federov, M. Melles
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引用次数: 3

摘要

摘要这项工作是对西伯利亚北部最深的湖泊列文森-莱辛湖的沉积记录进行的第一次古地磁研究。对从湖中部回收的Co1401号46 m长岩心上38 m处的730个离散样品进行了古地磁分析。进行了交变磁场退磁实验,得到了特征剩磁。利用磁化率、非滞后剩磁和等温剩磁对部分自然剩磁进行归一化,确定了相对古强度。Co1401的年代学来自加速质谱仪放射性碳年龄、光学激发发光定年以及642个离散样品的相对古强度与GLOPIS-75参考曲线的相关性。这项研究主要集中在bbb10ka部分,但也包括了岩心上部的初步结果。该记录包括Laschamps和Mono湖的地磁漂移,并解析了足够的地磁特征,以建立一个连续覆盖~62 ka的年代学。结果表明,该区在45 ~ 95 cm ka−1范围内具有连续沉降和高沉降速率。与沉积速率较低的参考记录数据集相比,磁记录的低变异性表明了高锁深。虽然Co1401的特征剩余磁化强度的水平分量只能谨慎使用,因为Co1401是在没有岩心段重叠的情况下取芯的,但Co1401的磁记录是北极切线柱上~62 ka以来相对古强度和古长期变化的唯一高分辨率记录。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A 62-ka geomagnetic palaeointensity record from the Taymyr Peninsula, Russian Arctic
Abstract. This work represents the first palaeomagnetic study carried out on the sedimentary record of lake Levinson-Lessing, which is the deepest lake in northern Central Siberia. Palaeomagnetic analyses were carried out on 730 discrete samples from the upper 38 m of the 46 m-long core Co1401, which was recovered from the central part of the lake. Alternating field demagnetisation experiments were carried out to obtain the characteristic remanent magnetisation. The relative palaeointensity is determined using the magnetic susceptibility, the anhysteretic remanent magnetization and the isothermal remanent magnetization for normalization of the partial natural remanent magnetization. The chronology of Co1401 derives from accelerated mass spectrometer radiocarbon ages, optically stimulated luminescence dating, and correlation of the relative palaeointensity of 642 discrete samples with the GLOPIS-75 reference curve. This study focuses on the part >10 ka but although includes preliminary results for the upper part of the core. The record includes the geomagnetic excursions Laschamps and Mono Lake, and resolves sufficient geomagnetic features to establish a chronology that continuously covers ~62 ka. The results reveal continuous sedimentation and high sedimentation rate between 45 and 95 cm ka−1. High lock-in depths are suggested from the low variability of the magnetic record compared to data sets of reference records with lower sedimentation rate. Although the horizontal component of the characteristic remanent magnetization can only be used with caution because Co1401 was cored without core segment overlap, the magnetic record of Co1401 is the only high-resolution record of relative palaeointensity and palaeosecular variations from the Arctic tangent cylinder going back to ~62 ka.
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来源期刊
Geochronology
Geochronology Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
0.00%
发文量
35
审稿时长
19 weeks
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