Timing and Extent of Late Quaternary Paleolakes in the Trans-Pecos Closed Basin, West Texas and South-Central New Mexico
Timing and Extent of Late Quaternary Paleolakes in the Trans-Pecos Closed Basin, West Texas and South-Central New Mexico
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德克萨斯州西部和新墨西哥州中南部 Trans-Pecos 封闭盆地晚第四纪古湖泊的形成时间和范围
DOI：
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发表时间：
1997
影响因子：
2.3
通讯作者：
Donald R. Currey
中科院分区：
文献类型：
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作者：
D. E. Wilkins;Donald R. Currey
跨佩科斯封闭盆地是一个面积20000平方公里的水文封闭区域，中心位于得克萨斯州埃尔帕索以东160公里的盐湖盆地。地貌和湖磁证据被用来确定金湖在最后一次冰川盛期(LGM)期间的四个主要高点。最近发现的第二个古湖萨克拉门托湖的其他地貌特征在比尔格拉斯次盆地中被发现，这是一个嵌套的次盆地，位于盐盆西北约75公里处。金湖沉积物中有机质的放射性碳测年结果表明，末次盛冰期发生了4次气候突变和快速湖侵，准周期为2000年。熊草次盆地的地貌证据表明，与金湖的湖旋回是同时代的。这些海侵的日期与研究人员在新墨西哥州其他地方的古湖盆地确定的清新事件的日期相关联。这些事件的准周期性与格陵兰冰芯中发现的Dansgaard-Oeschger事件相似。跨佩科斯海侵与该地区其他盆地的海侵事件的同期性表明，在末次盛冰期后期，该地区的古湖泊与气候突变是同步的。
The Trans-Pecos Closed Basin is a hydrographically closed region covering 20,000 km2centered on Salt Basin, 160 km east of El Paso, Texas. Geomorphic and limnetic evidence have been used to identify four major highstands for Lake King during the last glacial maximum (LGM). Additional geomorphic features from a second, recently identified, paleolake, Lake Sacramento, have been found in the Beargrass subbasin, a nested subbasin approximately 75 km northwest of Salt Basin. Radiocarbon ages of the organic material in Lake King sediments date four abrupt climate changes and rapid lacustrine transgressions during the LGM with a quasi-periodicity of 2000 yr. Geomorphic evidence in the Beargrass subbasin identifies lake cycles contemporaneous with those in Lake King. The dates for these transgressions correlate with the dates of freshening events identified by researchers in paleolake basins elsewhere in New Mexico. The quasi-periodicity of the events approximates that of Dansgaard–Oeschger events identified from Greenland ice cores. The contemporaneity of the Trans-Pecos transgressions with transgressive events in other basins in the region suggests that paleolakes in the region were in phase with respect to abrupt climate changes during the latter stages of the LGM.