کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5782483 | 1637220 | 2017 | 9 صفحه PDF | دانلود رایگان |
- Ferromanganese crusts in the northwest Pacific recorded reversals.
- Reversal patterns of the crusts can be used for ocean-scale correlations.
- Constant growth rates are indicated for each crust, which vary from 1.49-3.67Â mm/Ma.
Previous studies have shown that ferromanganese crusts in the Pacific Ocean commonly record paleomagnetic reversals and that the reversal patterns can be used to estimate growth rates. In order to investigate the applicability of the magnetostratigraphic method, we conducted paleomagnetic measurements of crust samples recovered from five locations in the northwest Pacific. A series of thin slices, with thicknesses of 0.5-1.0Â mm, was prepared for each sample, and a paleomagnetic polarity was determined for each slice. In all five samples, we found a consistent reversal pattern of N1-R1-N2-R2-N3 from the surface to the inner part of the crust. In three samples, another polarity interval (R3) was recognized below the N3 section of the crust. These data suggest that ferromanganese crusts in the northwest Pacific recorded paleomagnetic reversals and that reversal patterns can be used for ocean-scale correlations. The magnetostratigraphic method suggests constant growth rates of 1.49, 2.54, 3.56 and 3.67Â mm/Ma for four samples, three of which are consistent with those estimated using 10Be/9Be dating at the 2Ï (standard deviation) level.
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Journal: Ore Geology Reviews - Volume 87, July 2017, Pages 16-24