Relative and Numeric Age Data for Pleistocene Glacial Deposits and Diamictons in and near Sinks Canyon, Wind River Range, Wyoming, U.S.A
Relative and Numeric Age Data for Pleistocene Glacial Deposits and Diamictons in and near Sinks Canyon, Wind River Range, Wyoming, U.S.A
复制标题
美国怀俄明州风河山脉辛克斯峡谷及其附近更新世冰川沉积物和积聚岩的相对年龄和数值年龄数据
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
D. Dahms
中科院分区：
文献类型：
--
作者：
D. Dahms
摘要在怀俄明州兰德西南部的辛克斯峡谷内和附近发现了冰川沉积，代表了6个一级更新世冰川。沉积物的相对年龄分析(包括冰雹形态和土壤发育特征)表明，它们对应于以前在风河山脉(Pinedale，早期威斯康星州，公牛湖和Sacagawea Ridge)发现的4个冰川，以及2个更古老的冰川事件(Sacagawea Ridge之前的年轻和古老的冰川)。与衰退松林矿床有关的10Be和26Al暴露年龄与该范围内其他地区与衰退松林矿床有关的年龄相似。10Be和26Al暴露年龄也支持了威斯康星州早期矿床的识别。威斯康星州早期的沉积代表了第二个从风河山脉描述氧同位素第四阶段冰川沉积的地方。对较老的前萨卡加维亚山脊沉积的10Be暴露数据的初步分析表明，在氧同位素第18阶段(>；800ka)之前，这里发生了冰川推进。如果是真的，那么Sink Canyon包含了迄今为止风河山脉冰川作用最完整的记录，也是落基山脉氧同位素第18阶段之前更新世冰川作用的唯一报告记录。
Abstract Glacial deposits are identified from within and near Sinks Canyon, southwest of Lander, Wyoming, representing 6 first-order Pleistocene glaciations. Relative-age analyses of the deposits (including moraine morphology and soil development characteristics) indicate that they correspond to 4 glaciations previously identified from the Wind River Range (Pinedale, Early Wisconsin, Bull Lake, and Sacagawea Ridge) and to 2 older glacial events (Younger and Older Pre–Sacagawea Ridge). 10Be and 26Al exposure ages associated with recessional Pinedale deposits are similar to those associated with recessional Pinedale deposits elsewhere in the range. 10Be and 26Al exposure ages also support the identification of Early Wisconsin deposits here. The Early Wisconsin deposits represent the second locality where O-isotope stage 4 glacial deposits are described from the Wind River Range. Preliminary analysis of 10Be exposure data from the Older Pre–Sacagawea Ridge deposit suggests that a glacial advance occurred here before O-isotope stage 18 (>800 ka). If true, then Sinks Canyon contains the most complete record to date of glaciation in the Wind River Range and the only reported record of Pleistocene glaciation prior to O-isotope stage 18 in the Rocky Mountains.