Paleomagnetic Study of Late Pleistocene Lacustrine SedimentsFrom Owens and Mono Lakes, California

从加利福尼亚欧文斯湖回收了两个30米长的沉积物岩心。欧文斯湖岩心古地磁数据表明，这些岩心可以恢复高分辨率的古地磁长期变化（PSV）记录。该记录应该完全重叠Mono湖PSV记录，其中包括Mono湖偏移和偏移后重复波形的独特模式。将恢复欧文斯湖晚更新世的PSV记录，并检验莫诺湖记录的有效性。我们还将对欧文斯湖新岩心和莫诺湖储存的样品进行古强度研究。两湖的联合研究将为古强度记录提供重要的交叉验证。最后，PI将使用PSV相关性、放射性碳测年和岩石磁性数据来评估莫诺湖和欧文斯湖沉积物中记录的古气候变化的时间。这项研究将为北美西部的PSV（包括场矢量和古强度）提供一个重要的新的更高分辨率的视图，并将与其他正在进行的研究联系起来，以提供过去3万多年来北美PSV的更广泛的图景。

Two replicate 30-m sediment cores from Owens Lake California have been recovered. Paleomagnetic data from older Owens Lake core suggest that a high-resolution paleomagnetic secular variation (PSV) recorded can be recovered from these cores. This record should completely overlap the Mono Lake PSV record which includes the Mono Lake excursion and a distinctive pattern of repeating waveforms after the excursion. A PSV record from Owens Lake for late Pleistocene time will be recovered and the validity of the Mono Lake record tested. Paleointensity studies on both the new Owens Lake cores and our stored samples from Mono Lake will also be carried out. The combined study of both lakes will provide an important cross-validation for the paleointensity records. Finally, the PI will use PSV correlations, radiocarbon dates, and rock magnetic data to asses the timing of paleoclimatic changes recorded in the sediments of Mono and Owens Lakes. This study will provide an important new higher-resolution view of PSV (both field vector and paleointensity) in western North America and will be linked with other ongoing studies to provide a broader picture of North American PSV for more than the last 30,000 years.