首页> 美国卫生研究院文献>Scientific Reports >Paleosecular variation recorded by Quaternary lava flows from Guadeloupe Island
【2h】

Paleosecular variation recorded by Quaternary lava flows from Guadeloupe Island

机译:瓜德罗普岛第四纪熔岩流记录的古眼变化

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Paleomagnetic directional data were obtained from fourteen 0 to 2 Ma old lava flows at Basse-Terre Island (Guadeloupe, French West Indies). Five reversed polarity flows are consistent with their Matuyama age between 1.6–1.5 Ma and 875–790 ka while the ages of the other nine normal polarity units tie them to the Olduvai subchron and the Brunhes Chron. These directions have been combined with previous results obtained from Basse-Terre Island. The overall mean direction (D = −1.2°, I = 31.4°, α95 = 3.3°) obtained from the 39 non-transitional flows from Basse-Terre Island is indistinguishable from the expected geocentric axial dipole value (D = 0°, I = 29.8°). The dispersion measured from the angular standard deviation of the Virtual Geomagnetic Poles (VGPs) was found to be close to, but smaller than the predictions of geomagnetic models. Together with further directions from the nearby Martinique Island, the 45 directions obtained within the Brunhes chron provide the most robust estimate of the statistical distribution of paleosecular variation (PSV) at this latitude. The sequence of directions shows episodes of high amplitude secular variation that are coeval with several geomagnetic events including the last reversal documented by five transitional directions. Finally, three lava flows have recorded a transitional behavior which could be link to two excursions, the Laguna del Sello (at ~340 ka) and the Pringle Falls (at ~210 ka) events.
机译:古磁方向数据是从Basse-Terre岛(瓜德罗普岛,法属西印度群岛)的14条0至2 Ma的旧熔岩流中获得的。五个反极性流与它们的Matuyama年龄在1.6–1.5 Ma和875–790 ka之间是一致的,而其他九个正常极性单元的年龄将它们与Olduvai次纪和Brunhes Chron联系在一起。这些指示已与从Basse-Terre岛获得的先前结果结合在一起。从Basse-Terre岛的39条非过渡流获得的总平均方向(D = -1.2°,I = 31.4°,α95= 3.3°)与预期的地心轴向偶极子值(D = 0°,I = 29.8°)。从虚拟地磁极(VGP)的角度标准偏差测量的色散被发现接近但小于地磁模型的预测。加上附近马提尼克岛的进一步指示,Brunhes年代内获得的45个方向提供了该纬度下古生物变化(PSV)统计分布的最可靠估计。方向序列显示了高振幅长期变化的发作,与几个地磁事件同时发生,包括由五个过渡方向记录的最后一次逆转。最后,三个熔岩流记录了一个过渡行为,这可能与两个游览有关,Laguna del Sello(约340 ka)和Pringle Falls(约210 ka)事件。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号