A Possible Lacustrian Record of the Blake Episode from La Pine Oregon

地磁极性事件的高分辨率记录 是从一个20米长的珊瑚虫标本中发现的 来自俄勒冈州La Pine附近的湖泊沉积物。 这个时代 记录被限制在18,000年到60万年之间。基于 根据湖底序列较老部分的花粉年代 以及覆盖在冰川上的年轻冰川沉积物的年龄 湖床 该记录提供了一个VGP路径，该路径识别井- 定义了一个顺时针NE到SW的环路，半径为60 o， 第二个特点（年轻），描绘出一个逆时针， 位于东北象限的直径为30度， 以浅倾斜为特点。 这两个特点 特征类似于Blake中存在的两个特征 事件（105,000年和114,000年B. P.）。 PI将研究 通过对附近的平行截面进行采样， 仪表配置文件。 此外，他将做实地工作，以确定 并将迄今为止剖面中存在的标志层位 更准确地说，在现场可能的偏移。 计划进行热释光实验以验证 年代学工作。

A high-resolution record of a geomagnetic polarity episode has been recovered from a 20-meter section of diatomaceous lacustrine sediments from near La Pine, Oregon. The age of this record is constrained between 18,000 years and 0.6 m.y. based upon a pollen date from the older part of the lakebed sequence and the age of the younger glacial deposits that overlie the lakebeds. The record provides a VGP path that identifies a well- defined clockwise NE to SW loop with a radius of 60o, followed a second feature (younger) that traces out a counterclockwise which is 30 degrees in diameter residing in the NE quadrant and characterized by shallow inclinations. These two characteristic features are similar to the two features present in the Blake event (105,000 years and 114,000 years B.P.). The PI will study this phenomenon by sampling nearby parallel sections to the 20- meter profile. In addition, he will do field work to identify and correlate the marker horizons present in the section to date more accurately the possible excursion in the field. Thermoluminescence experiments are planned to verify the tephrachronology work.