Paleomagnetic Investigation of Brunhes-Matuyama Reversal, Chilean Andes

9316544布朗这个项目的目标是研究地球从反转到正常极性转变过程中的磁场行为。最近，作为智利安第斯山脉中部塔塔拉-圣佩德罗火山的更大跨学科研究的一部分，发现了一系列产生过渡古地磁方向的熔岩。随后，使用传统的K-Ar和激光40/39Ar技术进行的放射性测年，确定这些岩石有78万年的历史，也就是布伦斯-松山(B-M)反转的年龄。来自这11个气流的虚拟地磁极(VGP)聚集在澳大利亚-东南亚地区。这项对南半球反转记录(仅在火山岩中发现的第三个B-M记录)的详细研究将为优选路径和聚集VGP分析提供重要数据。

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.