RUI: High Resolution Records of Early Pliocene Geomagnetic Polarity Transitions from the Southern Hemisphere (Fiji)

今年8月在新墨西哥州圣达菲举行的SEDI会议上公布的最新结果提出了关于极性反转期间地球磁场行为的重要新问题。对松山-布鲁内斯和上Olduvai转变的研究表明，可能存在对逆转过程的地理控制，VGP路径沿着优先于美洲或东亚的轨道落下就是证据。为了测试是否存在对逆转过程的地理控制及其经久不衰，有必要检查多个地点连续逆转的记录。将对Suva Marl(Fiju)记录的Thvera、Sidufjall和Nunivak亚时线周围的极性转变进行详细的古地磁研究。这些记录应该有助于确定上新世-更新世过渡区的变异性是否是受地理限制的反转机制的不同表现。

Recent results presented at the SEDI Conference in Santa Fe, NM this August raised important new questions about the behavior of the geomagnetic field during polarity reversals. Studies of the Matuyama-Brunhes and upper Olduvai transitions suggest that there may exist a geographical control over the reversal process as evidence by VGP paths which fall along preferred tracks over the Americas or eastern Asia. In order to test the existence of a geographical control over the reversal process and its persistence through time it is necessary to examine records of successive reversals from multiple sites. A detailed paleomagnetic study of the polarity transitions bounding the Thvera, Sidufjall and Nunivak subchrons as recorded in the Suva Marl (Fiju) will be carried out. These records should help determine if the variability in Plio- Pleistocene transitional fields results from different manifestations of a geographically constrained reversal mechanism.