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

夏威夷怀阿奈火山熔岩中从吉尔伯特-高斯到上猛犸象反转序列的绝对古强度

• 批准号: 0207787
• 负责人: Emilio Herrero-Bervera
• 金额: $ 11.67万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0207787&HistoricalAwards=false
• 关键词: Absolute; Paleointensities; Gilbert; Gauss; Upper

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.

Emilio Herrero-Bervera 对夏威夷奥陶洛斯岛5个层序240个熔岩流的古地磁方向测量，覆盖了约0.36Ma的地磁场变化，并详细记录了Gilbert-Gauss（3.57Ma）、Lower猛犸（3.33Ma）和Upper猛犸（3.22Ma）的连续反转。因此，很明显，对这些观测结果的正确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。 这项研究的目的主要涉及到知识的领域的变化期间，如反转或短途旅行，但也到关键的时间间隔之前和之后的反转，到目前为止，只记录了一些沉积部分与冲突的意见。 该阿威'Wai序列提供了第一个特殊的机会，文件场的变化在一个时间段内，包括几个极性的间隔，从而文件场矢量在各种时间常数。 这是提取和提出地球发电机理论和数值模拟的重要约束条件的基本条件。 多个记录提供了确定字段值的适用性和结果置信度的最佳方法。