(Table 1) Depth and revised depth from ODP Sites 169-1033 and 169-1034

The Holocene section in Saanich Inlet, Vancouver Island, British Columbia, is 50-70 m thick. Cores from Saanich Inlet obtained during Leg 169S of the Ocean Drilling Program afford an excellent opportunity to obtain an ultrahigh-resolution paleomagnetic and environmental magnetic record for the Holocene and Late Pleistocene of western Canada. We have used an automated, long-core cryogenic magnetometer to study over 380 m of continuous u-channel samples from ODP Sites 1033 and 1034, the two sites that constitute Leg 169S. Holocene records of paleomagnetic inclination and intensity show excellent intra-site correlation and can be used to fine-tune the lithologic correlation among cores from each site. The Late Pleistocene magnetic records provide a means of intra-site correlation of the otherwise featureless marine clay. Near the Holocene/Late Pleistocene boundary, both sites contain a magnetic intensity feature that is interpreted as a Missoula-type flood event on the Fraser River. The composite Holocene inclination records from the two sites are quite similar and provide a means of comparing current age-models that are based on radiocarbon dating of material from each site. This comparison shows only minor differences in the available age-models. It also provides strong evidence that the sediments of Saanich Inlet represent a reliable record of geomagnetic field behavior.

不列颠哥伦比亚省温哥华岛萨尼奇湾（Saanich Inlet）的全新统地层厚度为50至70米。依托大洋钻探计划（Ocean Drilling Program, ODP）第169S航次获取的萨尼奇湾岩芯，可为加拿大西部全新世与晚更新世的超高分辨率古地磁及环境磁学记录研究提供绝佳契机。本次研究采用自动化长岩芯低温磁力仪，对取自ODP 1033与1034站位（二者构成第169S航次全部钻探站位）的380余米连续U型岩芯（u-channel）样品开展了分析。全新世古地磁倾角与强度记录展现出优异的站位内相关性，可用于优化各站位岩芯间的岩性对比精度。晚更新世磁学记录则为原本缺乏明显沉积特征的海相黏土提供了站位内对比的依据。在全新世/晚更新世边界附近，两个站位均出现一处磁强度异常特征，被解读为弗雷泽河（Fraser River）密苏拉型（Missoula-type）洪水事件的沉积记录。两个站位的复合全新世倾角记录高度相似，为对比基于各站位材料放射性碳定年的现有年龄模型提供了可行途径。对比结果显示现有年龄模型仅存在细微差异，同时也有力证实萨尼奇湾的沉积物可靠记录了地球磁场的演化特征。