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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Anisotropy of magnetic susceptibility as a tool for recognizing core deformation: reevaluation of the paleomagnetic record of Pleistocene sediments from drill hole OL-92, Owens Lake, California
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Anisotropy of magnetic susceptibility as a tool for recognizing core deformation: reevaluation of the paleomagnetic record of Pleistocene sediments from drill hole OL-92, Owens Lake, California

机译：磁化率各向异性作为识别岩心变形的工具：加利福尼亚州欧文斯湖OL-92钻孔更新世沉积物的古磁记录的重新评估

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摘要

At Owens Lake, California, paleomagnetic data document the Matuyama/Brunhes polarity boundary near the bottom of a 323-m core (OL-92) and display numerous directional fluctuations throughout the Brunhes chron. Many of the intervals of high directional dispersion were previously interpreted to record magnetic excursions. For the upper ～120 m, these interpretations were tested using the anisotropy of magnetic susceptibility (AMS), which typically defines a subhorizontal planar fabric for sediments deposited in quiet water. AMS data from intervals of deformed core, determined from detailed analysis of sedimentary structures, were compared to a reference AMS fabric derived from undisturbed sediment. This comparison shows that changes in the AMS fabric provide a means of screening core samples for deformation and the associated paleomagnetic record for the adverse effects of distortion. For that portion of core OL-92 studied here (about the upper 120 m), the combined analyses of sedimentary structures and AMS data demonstrate that most of the paleomagnetic features, previously interpreted as geomagnetic excursions, are likely the result of core deformation.
机译：在加利福尼亚的欧文斯湖，古磁数据记录了323米岩心底部（OL-92）附近的Matuyama / Brunhes极性边界，并且在整个Brunhes年代显示了许多方向性波动。先前已经解释了许多高方向性色散的间隔来记录磁偏移。对于〜120 m的上部，这些解释是使用磁化率各向异性（AMS）进行的，磁化率各向异性通常定义了一个水平的平面织物，用于沉积在安静水中的沉积物。通过对沉积结构的详细分析确定的变形岩心间隔的AMS数据与源自未扰动沉积物的参考AMS织物进行比较。这种比较表明，AMS织物的变化提供了一种方法，可以对芯样品进行变形和相关的古磁记录进行筛查，以了解变形的不利影响。对于此处研究的OL-92岩心部分（约120 m处），沉积结构和AMS数据的组合分析表明，大多数古磁特征（以前被解释为地磁偏移）可能是岩心变形的结果。

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