Polarity Transistion Studies in the Wai'anae Volcano: From the Gilbert-Gauss to the Upper Kaena Reversals

Herrero-Bervera 9909206 地球科学中最基本的问题之一是地磁场如何产生以及如何反转极性。在过去的几年里，人们投入了大量的精力来获取短暂过渡时期的记录，在此期间，磁场反转了极性。因此，当今最令人兴奋的地球物理测量之一是详细记录地球磁场在极性之间转变的情况。当前对地磁场反转的大部分兴趣集中在记录极性反转期间的详细场行为，以约束地磁发电机的各种模型。为了了解地核中产生的反转过程，需要详细的极性转变记录。研究人员提议研究夏威夷欧胡岛怀阿奈火山两个不同部分的三个连续极性转变的火山记录。这些反转是上猛犸象 (R-N)、下猛犸象 (N-R) 和上卡埃纳 (R-N)。在这个为期一年的项目中，研究人员将钻探这两个部分，进行必要的古地磁和岩磁实验室测量，并对结果进行完整的分析和解释。对这些逆转的古地层过渡行为的详细研究也将作为构建怀阿奈火山磁性地层学的基础。研究结果将有助于深入了解从吉尔伯特-高斯反转到上卡埃纳反转的古田行为及其与地球发电机的关系。

Herrero-Bervera 9909206 One of the most fundamental questions in Earth sciences is how the geomagnetic field is generated and is able to reverse polarity. During the last few years considerable effort has been devoted to the acquisition of records of the short transitional periods during which the field reverses polarity. Thus, today one of the most exciting geophysical measurements being made is the detailed recording of the Earth's magnetic field in transitions between polarities. Much of the current interest in geomagnetic field reversals is concentrated on documenting the detailed field behavior during polarity reversals in order to constrain the various models of the geomagnetic dynamo. Detailed polarity transition records are necessary in order to understand the reversal processes generated in the Earth's core. The investigators propose to study volcanic records of three successive polarity transitions located in two different sections found in the Wai'anae volcano, O'ahu, Hawaii. These reversals are the Upper Mammoth (R-N), the Lower (N-R) and Upper Kaena (R-N). In this one-year project, the investigators will drill both sections, perform the necessary paleomagnetic and rock-magnetic laboratory measurements, and complete analysis and interpretation of the results. This detailed study of the transitional behavior of the paleofield of those reversals will also serve as the basis for the construction of the magnetostratigraphy of the Wai'anae volcano. The results will provide insight into the paleofield behavior from the Gilbert-Gauss to the Upper Kaena reversals and their relationship to the geodynamo.