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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Geomagnetic paleointensity and directional secular variation at Ocean Drilling Program (ODP) Site 984 (Bjorn Drift) since 500 ka: Comparisons with ODP Site 983 (Gardar Drift)
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Geomagnetic paleointensity and directional secular variation at Ocean Drilling Program (ODP) Site 984 (Bjorn Drift) since 500 ka: Comparisons with ODP Site 983 (Gardar Drift)

机译：自500 ka以来海洋钻探计划（ODP）984号站点（Bjorn Drift）的地磁古强度和方向长期变化：与ODP 983号站点（Gardar Drift）的比较

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摘要

Normalized remanence (relative geomagnetic paleointensity) records for the last 500 kyr can be matched between two Iceland Basin Ocean Drilling Program (ODP) sites (984 and 983) and correlated with other high-resolution records. Directional secular variation is, however, not easily correlated between sites due to inadequate recording, at these mean sedimentation rates (12-15 cm/kyr), of the characteristic high frequency variability of the directional record. Both sites record the Iceland Basin event at approx 186-189 ka in which the characteristic magnetization component rotates through 180 deg and back, coincident with a paleointensity low that lasted about 3 kyr. Other Brunhes Chron geomagnetic excursions appear to be manifest as intervals of higher-amplitude secular variation during lows in paleointensity. There is a tendency for paleointensity lows to correlate with peak interglacials in the oxygen isotope records; however, this does not translate into a correlation between paleointensity and percent carbonate or between paleointensity and magnetic concentration or grain size parameters.
机译：可以在两个冰岛海盆海洋钻探计划（ODP）站点（984和983）之间匹配最近500 kyr的标准化剩磁（相对地磁古强度）记录，并将其与其他高分辨率记录相关联。然而，由于在这些平均沉降速率（12-15 cm / kyr）下，定向记录的特征性高频变化不充分，记录不充分，因此地点之间的定向长期变化不容易相关。两个站点都记录了约186-189 ka的冰岛盆地事件，其中特征磁化分量旋转了180度并反向旋转，与持续约3年的古低强度相吻合。其他Brunhes Chron地磁偏移似乎表现为古强度低时高振幅长期变化的间隔。在氧同位素记录中，古强度低趋势与峰值间冰期有关。但是，这并没有转化为古强度和碳酸盐百分率之间或古强度与磁浓度或晶粒度参数之间的相关性。

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