Absolute Paleointensities From the Gilbert-Gauss to the Upper Mammoth Reversal Sequences in Lavas on the Wai'anae Volcano, Hawaii

EAR-0207787埃米利奥·赫雷罗-贝维拉从夏威夷奥胡岛5个序列的240个熔岩流测得的古地磁方向覆盖了约0.36 Ma的地磁场变化，包括连续的Gilbert-Gauss(3.57 Ma)的详细记录，下猛犸象(3.33 Ma)和上猛犸象(3.22 Ma)反转。因此，很明显，对这些观测的适当分析需要记录总场矢量，从而对绝对古强度进行详尽的研究。这项研究的目标主要涉及对诸如反转或漂移等时期的场变化的了解，但也与反转之前和之后的关键时间间隔有关，到目前为止，这些时间间隔只从少数几个相互矛盾的沉积剖面中记录下来。Wai‘anae序列提供了第一次特殊的机会来记录一段时间内的场变化，其中包括几个极性间隔，从而记录各种时间常数上的场矢量。这是提取和提出对地球发电机的理论和数值模拟的重要约束的基本条件。多条记录提供了确定字段值的适宜性和结果的置信度的最佳方法。

EAR-0207787Emilio Herrero-Bervera Paleomagnetic directions measured from 240 lava flows in 5 sequences on the island of O'ahu (Hawaii) cover about 0.36 Ma of geomagnetic field changes and include detailed records of the successive Gilbert-Gauss (3.57 Ma), Lower Mammoth (3.33 Ma) and Upper Mammoth (3.22Ma) reversals. Thus, it is clear that proper analysis of these observations require to document the total field vector and thus to conduct an exhaustive study of absolute paleointensity. The objectives of the study are primarily related to the knowledge of the field variations during periods like reversals or excursions but also to the critical time intervals that precede and follow reversals that so far have been only documented from a few sedimentary sections with conflicting observations. The Wai'anae sequences offer the first exceptional opportunity to document field variations over a time period that includes several polarity intervals and thus document the field vector over various time constants. This is a basic condition to extract and bring up significant constraints for theoretical and numerical modeling of the geodynamo. Multiple records offer the best approach to determine the suitability of the field values and the degree of confidence of the results.