High-resolution magnetostratigraphy of four sediment cores from the Greenland Sea—I. Identification of the Mono Lake excursion, Laschamp and Biwa I/Jamaica geomagnetic polarity events
High-resolution magnetostratigraphy of four sediment cores from the Greenland Sea—I. Identification of the Mono Lake excursion, Laschamp and Biwa I/Jamaica geomagnetic polarity events
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格陵兰海四个沉积岩芯的高分辨率磁地层学——I.莫诺湖偏移、Laschamp 和 Biwa I/牙买加地磁极性事件的识别
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
M. Antonow
中科院分区：
文献类型：
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作者：
N. Nowaczyk;M. Antonow
对格陵兰盆地Vester is Banken火山海山底部的三个沉积岩芯和Jan Mayen断裂带的一个沉积岩芯进行的高分辨率高分辨率磁层分析显示，在过去200 ka内有三个明显的地磁事件的记录。通过稳定碳、氧同位素分析、AMS14C测量和生物地层学数据(有孔虫丰度)得出莫诺湖漂移的年龄为28~27ka，拉尚事件的年龄为37~33ka，碧洼I事件的年龄为189179 ka。在至少一个核心中，拉尚事件显示了当地地磁场矢量的完全颠倒。Biwa I事件也是如此，记录在其中一个核心中。
SUMMARY High-resolution magnetostratigraphic analysis of three sediment cores from the base of the volcanic seamount Vesteris Banken in the Greenland Basin and one core from the Jan Mayen Fracture Zone revealed records of three pronounced geomagnetic events within the last 200 ka. Dating by stable carbon and oxygen isotope analysis, AMS14C measurements and biostratigraphic data (foraminifera abundances) yielded ages of 28-27 ka for the Mono Lake excursion, 37-33 ka for the Laschamp event, and 189179 ka for the Biwa I event. In at least one of the cores the Laschamp event exhibits a full reversal of the local geomagnetic field vector. The same is true of the Biwa I event, documented in one of the cores.