Origin, structure and geochemistry of a rock glacier near Don Juan Pond, Wright Valley, Antarctica
Origin, structure and geochemistry of a rock glacier near Don Juan Pond, Wright Valley, Antarctica
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南极洲莱特谷唐胡安池附近岩石冰川的起源、结构和地球化学
DOI：
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发表时间：
2020
影响因子：
1.6
通讯作者：
Daniel F. Schmidt
中科院分区：
文献类型：
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作者：
K. Winsor;Kate M. Swanger;E. Babcock;J. Dickson;Rachel D. Valletta;Daniel F. Schmidt
摘要 赖特谷南叉包含南极洲麦克默多干谷中最大的岩石冰川之一，从迷宫东部边界延伸 7 公里，终止于唐胡安池 (DJP)。在这里，我们利用探地雷达 (GPR)、定性实地观测、土壤淋滤分析和 X 射线衍射分析的结果来研究岩石冰川的发育。探地雷达数据中缺乏明显的清洁冰，再加上对距骨和谷壁间质冰流入的观察，支持通过距骨积累形成岩石冰川。以石英为主的地下成分和不连续、发育良好的沙漠路面表明最初的岩石冰川形成发生在第四纪晚期之前。土壤淋滤分析的主要离子数据显示，岩石冰川和距骨样本中的盐浓度较高，接近高盐度 DJP。这些观察结果表明，DJP 是岩石冰川以及周围的距骨斜坡的当地盐源，这些斜坡上有水道系统，将溶质输送回湖中，这表明存在当地的反馈系统。最后，岩石冰川上缺乏湖泊沉积与末次盛冰期冰川堰塞湖向南福克的推进不一致。
Abstract The South Fork of Wright Valley contains one of the largest rock glaciers in the McMurdo Dry Valleys, Antarctica, stretching 7 km from the eastern boundary of the Labyrinth and terminating at Don Juan Pond (DJP). Here, we use results from ground-penetrating radar (GPR), qualitative field observations, soil leaching analyses and X-ray diffraction analyses to investigate rock glacier development. The absence of significant clean ice in GPR data, paired with observations of talus and interstitial ice influx from the valley walls, support rock glacier formation via talus accumulation. A quartz-dominated subsurface composition and discontinuous, well-developed desert pavements suggest initial rock glacier formation occurred before the late Quaternary. Major ion data from soil leaching analyses show higher salt concentrations in the rock glacier and talus samples that are close to hypersaline DJP. These observations suggest that DJP acts as a local salt source to the rock glacier, as well as the surrounding talus slopes that host water track systems that deliver solutes back into the lake, suggesting a local feedback system. Finally, the lack of lacustrine sedimentation on the rock glacier is inconsistent with the advance of a glacially dammed lake into South Fork during the Last Glacial Maximum.
火星上中纬度冰川状结构的面积和体积
影响因子：
5.3
作者：
Brough S
通讯作者：
Brough S
唐璜池的地球化学：南极洲莱特谷深层地下水流动系统的证据
影响因子：
5.3
作者：
Toner, J.D.;Catling, D.C.;Sletten, R.S.
通讯作者：
Sletten, R.S.