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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 >Geomagnetic paleosecular variation at Hawaii around 3 Ma from a sequence of 107 lava flows at Kaena Point (Oahu)
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Geomagnetic paleosecular variation at Hawaii around 3 Ma from a sequence of 107 lava flows at Kaena Point (Oahu)

机译：夏威夷Kaena Point（瓦胡岛）的107次熔岩流序列在3 Ma左右的夏威夷地磁古生物变化

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摘要

We have sampled a sequence of 107 lava flows in the Waianae series on Oahu, Hawaii, in two separate stretches. The first (51 flows) at Kaena Point extends from sea level to an altitude of 190 m, and the second (56 flows) follows the Satellite Tracking Station road from 218 m to 360 m above sea level. Thermal and af demagnetization yield very similar results, and reveal only normal polarities. K/Ar dating at five different horizons combined with the paleomagnetic results indicate that the sequence was emplaced entirely in the normal polarity interval between the Upper Mammoth and the Lower Kaena polarity transitions (3.22-3.11 Ma). Some of the flows are serially correlated. Filtering does not, however, drastically affect the final results. Inclinations are shallower than those expected from a centered dipole field. Although large (approx 13 deg), the inclination anomaly is consistent with results from other sites at the same latitude. The scatter of the VGPs about the geographic pole is consistent with available data from other regions at similar latitudes. The scatter of the directions is also consistent with the predictions of recent statistical models of paleosecular variation. Therefore, these results do not support the hypothesis of a Pacific dipole window.
机译：我们在夏威夷瓦胡岛的Waianae系列采样了107个熔岩流序列，分两个部分进行。 Kaena Point的第一个流量（51个流量）从海平面延伸到190 m的高度，第二个流量（56个流量）沿着卫星跟踪站的道路从海拔218 m到360 m。热和自动退磁产生非常相似的结果，并且仅显示正常极性。在五个不同层位的K / Ar测年与古地磁结果相结合，表明该序列完全位于上猛mm象和下Kaena极性转变（3.22-3.11 Ma）之间的正常极性区间内。一些流是串行相关的。但是，过滤不会严重影响最终结果。倾斜度比中心偶极子场的预期的浅。尽管较大（大约13度），但倾斜度异常与其他纬度相同的站点的结果一致。 VGP在地理极点上的散布与来自其他纬度相似地区的数据一致。方向的分散也与最近的古眼变化统计模型的预测一致。因此，这些结果不支持太平洋偶极子窗口的假设。

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