Recent Glacial History of an Alpine Area in the Colorado Front Range, U.S.A.: II. Dating the Glacial Deposits
Recent Glacial History of an Alpine Area in the Colorado Front Range, U.S.A.: II. Dating the Glacial Deposits
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美国科罗拉多州前沿山脉高山地区的近期冰川历史：II。
DOI：
10.1017/s0022143000020414
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发表时间：
1968
影响因子：
3.4
通讯作者：
J. B. Benedict
中科院分区：
文献类型：
--
作者：
J. B. Benedict
摘要科罗拉多前缘山脉印第安峰地区最近的冰川沉积已经用地衣计量法测定了年龄，使用的是当地开发的地理根果生长曲线。放射性碳年代往往支持地衣年代学。在过去的4500年里，该地区发生了三次不同的冰期，每一次都由几个微小的脉动组成。最早的先锋(寺湖体育场)可以追溯到公元前2500-700年。后来的进步(阿里卡里体育场)大约在公元后开始。公元100年，最后以公元4年结束1000。最近的进展(Gannett Peak Stade)的日期是公元后。1650-1850年。阿里卡里体育场是否纯粹是当地的开发项目，或者冰川在这段时间里是否在科迪勒兰地区的其他地方向前推进，还有待观察。科罗拉多前锋山脉以东的平原上的冲刷似乎发生在山脉冰川消退的阶段。
Abstract Recent glacial deposits in the Indian Peaks area of the Colorado Front Range have been dated lichenometricaily, using a growth curve developed locally for Rhizocarpon geographicum. Radiocarbon dates, where available, tend to support the lichen chronology. Three distinct intervals of glaciation, each consisting of several minor pulsations, have occurred in the area during the past 4500 years. The earliest advance (Temple Lake Stade) is dated at 2500–700 b.c. A later advance (Arikaree Stade) began in about a.d. 100 and ended in a.d. 1000. The most recent advance (Gannett Peak Stade) is dated at a.d. 1650–1850. It remains to be seen whether the Arikaree Stade was purely a local development or whether glaciers were advancing elsewhere in the cordilleran region during this interval. Alluviation on the plains east of the Colorado Front Range seems to have occurred during the waning stages of mountain glaciation.