Paleomagnetic Investigation of Brunhes-Matuyama Reversal, Chilean Andes

智利安第斯山脉 Brunhes-Matuyama 反转的古地磁调查

• 批准号: 9316544
• 负责人: Laurie Brown
• 金额: $ 6.81万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-12-15 至 1996-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316544&HistoricalAwards=false
• 关键词: Paleomagnetic; Investigation; Brunhes; Matuyama; Reversal

9316544 Brown The objective of this project is to investigate the behavior of the Earth's magnetic field during a transition from reversed to normal polarity. Recently a sequence of lavas yielding transitional paleomagnetic directions was discovered as part of a larger interdisciplinary study of Volcan Tatara-San Pedro in the central Chilean Andes. Subsequent radiometric dating, using both traditional K-Ar and laser 40/39 Ar techniques, has identified the rocks as being 780,000 years old, the age of the Brunhes-Matuyama (B-M) reversal. Virtual geomagnetic poles (VGPs) from these eleven flows cluster around Australia - Southeast Asia. This detailed study of a Southern Hemisphere reversal record (only the third B-M identified in volcanic rocks) will provide important data for preferred paths and clustered VGP analyses.

9316544棕色该项目的目的是研究从反转到正常极性过渡期间地球磁场的行为。 最近，发现了一系列产生过渡性古磁方向的熔岩，这是对智利安第斯山脉的Volcan Tatara-san Pedro进行更大的跨学科研究的一部分。 随后使用传统的K-AR和激光40/39 AR技术的辐射测定已确定岩石已有780,000年的历史，即Brunhes-Matuyama（B-M）的年龄。 来自澳大利亚东南亚的11个流量集中的虚拟地磁杆（VGP）。 这项对南半球逆转记录的详细研究（仅在火山岩中鉴定出的第三个B-M）将为首选路径和聚类VGP分析提供重要数据。