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.

EAR-02077877 EMILIO HERRERO-BEREVERA古磁方向从5个序列中的240个熔岩流中测得，覆盖了O'Ahu（夏威夷）（夏威夷）的5个序列，约0.36 mA的地震磁场变化，并包括连续的Gilbert-Gauss（3.57 MA），下mammmoth（3.3333 MA Amm tuper）（3.33 MAMM）（3.33 MAMM）（3.33 MAMM）（3.33 MAMM）（3.33 MAMM）（3.33 MAMM）（3.33 MAMM）（3.22222）因此，很明显，对这些观察结果的正确分析需要记录总场矢量，从而对绝对古显着进行详尽的研究。 该研究的目标主要与逆转或偏移等时期的田间变化的知识有关，也与之前的关键时间间隔和遵循逆转之前的关键时间间隔有关，这些逆转仅记录在少数沉积物中，观察到了冲突。 Wai'anae序列提供了第一个出色的机会，可以在一个时间段内记录场地变化，其中包括几个极性间隔，从而在各个时间常数上记录了现场向量。 这是提取和提出严重限制的基本条件，以对地球的理论和数值建模进行重大约束。 多个记录提供了确定现场值的适用性和结果信心程度的最佳方法。