Geologic Test for Extent of Wisconsinian Glaciation on Southern Baffin Island, Arctic Canada, from Exposure Ages Determined by Radionuclides 26A1 and 10Be

9321733戴维斯这个奖项是为了支持一个项目，以完善巴芬岛南部的冰川年代学，通过确定抛光和条纹基岩表面和冰碛巨石的宇宙成因暴露年龄。 为了估计冰消期的时间，石英中的铍-10和铝-26分离自：1）谷底和沿着峡湾侧壁的抛光和条纹状基岩表面，以及2）将测量嵌套的冰碛物上的巨石。 初步结果表明，巴芬岛南部Pangnirtung地区的冰川消退发生在大约7,500年前。 这项工作将提供信息，以帮助解决一个长期存在的争议，在第四纪科学涉及的范围内的冰盖在加拿大北极东部在威斯康星州晚期。 ***

9321733 Davis This award is for support for a project to refine the glacial chronology on southern Baffin Island by determining cosmogenic exposure ages of polished and striated bedrock surfaces and morainal boulders. In order to estimate the timing of deglaciation, the Beryllium-10 and Aluminum-26 in quartz separates from: 1) polished and striated bedrock surfaces on valley bottoms and along fjord sidewalls, and 2) boulders on nested sets of moraines will be measured. Preliminary results suggest that deglaciation in the Pangnirtung area of southern Baffin Island occurred around 7,500 years ago. This work will provide information to help resolve a long-standing controversy in Quaternary science involving the extent of ice sheets in the eastern Canadian Arctic during the late Wisconsinan. ***