GEOLOGY OF THE USA CRREL PERMAFROST TUNNEL FAIRBANKS, ALASKA
GEOLOGY OF THE USA CRREL PERMAFROST TUNNEL FAIRBANKS, ALASKA
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DOI：
10.21236/ad0660310
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发表时间：
1967-07
期刊：
影响因子：
--
通讯作者：
P. Sellmann
中科院分区：
文献类型：
--
作者：
P. Sellmann
摘要：该研究提供了隧道现场和周围环境的相关区域和历史地质资料，以及隧道所通过材料的指标性质和地震速度数据。该隧道位于不连续多年冻土带，重点讨论了基岩、砾石、淤泥、地冰和化学梯度。根据冰楔的结构和分布、化学梯度、沉积结构、放射性碳测年以及沿隧道段和垂直通风井暴露的材料的岩性，对该剖面的地层学研究揭示了该地区过去的气候历史。剖面上出现了两个可识别的不整合面。楔体的大尺寸表明，在楔体发育时期，沉积速率相当缓慢。还可以得出结论，在过去的3万年里，至少沉积了30英尺的淤泥，其中大部分是威斯康辛年龄的。
Abstract : The study provides the pertinent regional and historical geology of the tunnel site and immediate surroundings as well as data on the index properties and seismic velocities of the material through which the tunnel passes. The tunnel, located in the discontinuous permafrost zone, is discussed with emphasis on bedrock, gravel, silt, ground ice, and chemical gradient. A study of the stratigraphy of the section reveals a record of the past climatic history of the area, based on the structure and distribution of the ice wedges, chemical gradients, sedimentary structures, radiocarbon dates, and the lithology of the material exposed along the tunnel section and vertical ventilation shaft. Two recognizable unconformities appear in the section. The large size of the wedges suggests that depositional rates were fairly slow during the period of wedge development. It can also be concluded that within the last 30,000 yr a minimum of 30 ft of silt was deposited, most of which is Wisconsin age.