Thinking Like a Dune Field: Geologic History in the Nebraska Sand Hills

Loope David B.; Swinehart James

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Thinking Like a Dune Field: Geologic History in the Nebraska Sand Hills

机译：像沙丘场一样思考：内布拉斯加州沙丘的地质历史

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The Nebraska Sand Hills region is a giant dune field that is presently stabilized by prairie vegetation. During numerous severe droughts within the last 15,000 years, the dunes have lost their plant cover and have migrated freely. Wetlands between dunes are extensive in the central Sand Hills and are connected to the High Plains (Ogallala) aquifer. Lakes and wetlands were formed when dunes blocked and deranged stream systems. Evaporation of water from wetlands may benefit adjacent dune vegetation during extended droughts, by locally increasing humidity and rainfall. Buried bison tracks are abundant within the dunes, suggesting that grass and water remained available in some interdunes, even during episodes of dune migration. Study of the geologic processes operating within this dune field enhances not only our ability to read the paleoclimatic history of the Great Plains, but also our understanding of features found within similar deposits from the rock record.

机译：内布拉斯加州沙丘地区是一个巨大的沙丘地带，目前已被草原植被所稳定。在过去的15,000年中，在多次严重干旱中，沙丘失去了植被，可以自由迁移。沙丘之间的湿地遍布沙丘中部，并与高平原（奥加拉拉）含水层相连。当沙丘阻塞并扰乱河流系统时，形成了湖泊和湿地。在局部干旱和干旱期间，湿地蒸发的水分可能会通过局部增加湿度和降雨使邻近的沙丘植被受益。沙丘中埋藏的野牛踪迹很丰富，这表明某些沙丘中甚至在沙丘迁徙期间仍然有草和水。对在此沙丘场中运行的地质过程的研究不仅增强了我们阅读大平原古气候历史的能力，而且还增强了我们对岩石记录中类似矿床中发现的特征的理解。

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《Great Plains Research》 |2008年第1期|共32页
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Loope David B.; Swinehart James;
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Thinking Like a Dune Field: Geologic History in the Nebraska Sand Hills

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