Laurentide, cordilleran, and montane glaciation in the western Peace River — Grande Prairie region, Alberta and British Columbia, Canada
Laurentide, cordilleran, and montane glaciation in the western Peace River — Grande Prairie region, Alberta and British Columbia, Canada
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皮斯河西部的劳伦泰德冰川、科迪勒拉冰川和山地冰川作用——加拿大艾伯塔省和不列颠哥伦比亚省大草原地区
DOI：
10.1016/1040-6182(95)00061-5
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发表时间：
1996
影响因子：
2.2
通讯作者：
N. Rutter
中科院分区：
文献类型：
--
作者：
N. Catto;D. Liverman;P. Bobrowsky;N. Rutter
在过去的十年中，在西北部阿尔伯塔和东北部不列颠哥伦比亚省的和平河-大草原区西部的地质调查提供了重要的年代地层学信息劳伦蒂德，科迪勒支和山地第四纪冰川事件。大量的14 C年龄测定，以及地层和沉积学分析的许多曝光，表明这一地区是第一次冰川的科迪冰川晚威斯康星之前的某个时候。在后期的威斯康星州，CA。22，000 - 14，000 BP，劳伦蒂德冰川覆盖了大部分地区。在大约15，000到10，000 BP之间，山地冰只影响了和平地区的西部。没有证据表明冰的前进是同步的，因此，没有证据表明该地区的冰聚结。由此产生的“无冰走廊”很可能是一个横向波动带，存在于晚更新世的几千年的时间。这一时期“走廊”沿着的气候条件可能不利于人类迁徙，但对一些植物和小动物来说是足够的。许多沿着落基山脉北方西部山麓的孤立地区，劳伦泰德冰川作用界限以西，在威斯康星晚期从未发生过冰川作用。
Geological investigations over the last decade in the western Peace River-Grande Prairie district of northwestern Alberta and northeastern British Columbia have provided important chronostratigraphic information regarding Laurentide, Cordilleran and Montane Quaternary glacial events. Numerous14C age determinations, as well as stratigraphic and sedimentological analyses of numerous exposures, indicate that this area was first glaciated by Cordilleran ice sometime before the Late Wisconsinan. During the Late Wisconsinan, ca. 22,000–14,000 BP, Laurentide glacier ice covered much of the area. Between approximately 15,000 and 10,000 BP, Montane ice affected only the western part of the Peace region. There is no evidence for synchroneity of the ice advances and, therefore, no evidence for ice coalescence in this region. The resultant ‘ice-free-corridor’ was most likely a laterally fluctuating zone which existed during a several thousand year period in the Late Pleistocene. Climatic conditions along the ‘corridor’ during this period were probably unfavorable for human migration, but adequate for some plants and small animals. Numerous isolated areas along the western foothills of the northern Rocky Mountains, west of the Laurentide glaciation limit, were never glaciated during the Late Wisconsinan.