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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A 20-15 ka high-resolution paleomagnetic secular variation record from Black Sea sediments - no evidence for the 'Hilina Pali excursion'?
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A 20-15 ka high-resolution paleomagnetic secular variation record from Black Sea sediments - no evidence for the 'Hilina Pali excursion'?

机译：来自黑海沉积物的20-15 kA高分辨率古磁性古磁性异常记录 - 没有证据“海里拉帕利游览”？

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摘要

A comprehensive magnetostratigraphic investigation on sixteen sediment cores from the southeastern Black Sea yielded a very detailed high-quality paleosecular variation (PSV) record spanning from 20 to 15 ka. The age models are based on radiocarbon dating, stratigraphic correlation, and tephrochronology. Further age constraints were obtained by correlating four meltwater events, described from the western Black Sea, ranging in age from about 17 to 15 ka, with maxima in K/Ti ratios, obtained from X-ray fluorescence (XRF) scanning, and minima in S-ratios, reflecting increased hematite content, in the studied cores. Since the sedimentation rates in the investigated time window are up to 50 cm ka(-1), the obtained PSVs records enabled a stacking using 50-yr bins. A directional anomaly at 18.5 ka, associated with pronounced swings in inclination and declination, as well as a low in relative paleointensity (rPl), is probably contemporaneous with the Hilina Pali excursion, originally reported from Hawaiian lava flows. However, virtual geomagnetic poles (VGPs) calculated from Black Sea sediments are not located at latitudes lower than 60 degrees N, which denotes normal, though pronounced secular variations. During the postulated Hilina Pali excursion, the VGPs calculated from Black Sea data migrated clockwise only along the coasts of the Arctic Ocean from NE Canada (20.0 ka), via Alaska (18.6 ka) and NE Siberia (18.0 ka) to Svalbard (17.0 ka), then looping clockwise through the Eastern Arctic Ocean. (C) 2018 Elsevier B.V. All rights reserved.
机译：十六个沉积物岩芯的综合磁性地层调查从东南部黑海产生跨越20至15万年了非常细致的高品质paleosecular变化（PSV）的纪录。年龄模型是基于放射性碳测年，地层对比和tephrochronology。此外年龄约束条件通过关联4点融水的事件，从西部黑海描述的，年龄从约17至15 KA，在K /钛比率，由X射线荧光（XRF）扫描得到的最大值得到的，和最小值在S-比率，反映增加的赤铁矿含量，在所研究的核心。由于在研究时间窗口中的沉降速率可达到50厘米KA（-1），将得到的PSV船记录启用一个堆叠使用50年的二进制位。一种定向异常在18.5 KA，在倾角和磁偏角明显波动，以及在相对paleointensity（RPL）的低相关，可能是与Hilina巴利偏移同时发生，从夏威夷熔岩流最初报告。然而，从黑海沉积物计算的虚拟地磁极（虚地磁极）不位于纬度低于60°N，其表示正常，尽管显着的长期变化。在假定Hilina爬犁游览，从黑海数据计算的虚地磁极仅沿北冰洋从NE加拿大（20.0 KA）海岸顺时针迁移，通过阿拉斯加（18.6 KA）和东北西伯利亚（18.0 KA）斯瓦尔巴群岛（17.0 KA ），然后通过北冰洋东部循环顺时针旋转。 （c）2018年elestvier b.v.保留所有权利。

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