Gimli beach in Manitoba is one of the lowest elevation beaches in the southern Lake Agassiz basin, and is a distinct ridge composed of bedded sand and gravel that rises above the lake plain and extends for more than 40 km. Ten new optically stimulated luminescence (OSL) ages from Gimli beach yield ages mostly ranging from 9.7 ± 0.7 to 10.5 ± 0.8 ka (average 10.3 ± 0.5 ka), which is older by 0.6 to >1.0 ka than age estimates of previous researchers. Two of our new OSL ages are notably older than the others, dating to ~11.3 ± 0.8 and 13.9 ± 1.0 ka, which we attribute to poorly bleached sands. We ascribe an age of about 10 ka to Gimli beach, which is several centuries before overflow from Lake Agassiz and its vast drainage basin shifted from the western Great Lakes to glacial Lake Ojibway and the St. Lawrence Valley.

中文翻译：

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基于新的OSL约会的Agassiz湖Gimli海滩年龄

曼尼托巴省的Gimli海滩是南部阿加西兹湖盆地中海拔最低的海滩之一，是由层状沙子和砾石组成的独特山脊，高出湖平原，延伸超过40公里。Gimli海滩的10个新的光激发发光（OSL）年龄产生的年龄大多在9.7±0.7至10.5±0.8 ka（平均10.3±0.5 ka）的范围内，比以前的研究人员的年龄估计高0.6至> 1.0 ka。我们的两个新OSL年龄明显比其他年龄大，分别为〜11.3±0.8和13.9±1.0 ka，这归因于未充分漂白的沙子。我们将Gimli海滩的年龄定为大约10 ka，这是几个世纪之后，Agassiz湖溢出而来的，其巨大的流域从西部的大湖转移到冰川湖Ojibway和圣劳伦斯山谷。