An Exhumed Late Paleozoic Canyon in the Rocky Mountains: A Discussion
An Exhumed Late Paleozoic Canyon in the Rocky Mountains: A Discussion
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落基山脉发掘的晚古生代峡谷：讨论
DOI：
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发表时间：
2009
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影响因子：
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通讯作者：
W. C. Hood
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作者：
W. C. Hood
乌纳韦普峡谷是一个横跨科罗拉多昂康帕格雷高原的壮观的风隙，它的起源、改造和废弃一直是争议的主题。早期对Unaweep峡谷的解释认为它是新生代的侵蚀特征。最近，Soreghan等人（2007年）提出了一个假设，即Unaweep峡谷是一个二叠纪冰川谷，充满了古生代沉积物，随后被新生代河流挖出。为了研究他们的冰川假说，Soreghan和同事在峡谷钻了两个洞（Soreghan et al. 2005）。第一个钻孔未能到达基岩，但第二个钻孔到达了329 m处的前寒武纪基底，并验证了早期的地球物理证据（Oesleby 1983），即峡谷含有厚冲积物。通过物理确认，峡谷有一个厚厚的填充物，Soreghan团队作出了重大贡献，我们的峡谷的理解。然而，这些证据也适用于其他解释，表明二叠纪冰川假说是极不可能的。
The origin, modification, and abandonment of Unaweep Canyon, a spectacular wind gap that crosses the Uncompahgre Plateau in Colorado, has long been the subject of controversy. Earlier interpretations of Unaweep Canyon have considered it to be a Cenozoic erosional feature. Recently Soreghan et al. (2007) presented the hypothesis that Unaweep Canyon is a Permian glacial valley that was filled with Paleozoic sediment and subsequently exhumed by Cenozoic rivers. To investigate their glacial hypothesis, Soreghan and coworkers drilled two holes in the canyon (Soreghan et al. 2005). The first hole failed to reach bedrock, but the second reached Precambrian basement at 329 m and verified earlier geophysical evidence (Oesleby 1983) that the canyon contains a thick alluvial fill. By physically confirming that the canyon has a thick fill, the Soreghan teammade a significant contribution to our understanding of the canyon. However, the evidence lends itself to other interpretations that indicate that the Permian glacial hypothesis is highly unlikely.