A depositional model for Rogen moraine, with examples from the Avalon Peninsula, Newfoundland
A depositional model for Rogen moraine, with examples from the Avalon Peninsula, Newfoundland
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罗根冰碛的沉积模型，以纽芬兰阿瓦隆半岛为例
DOI：
10.1139/e92-058
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发表时间：
1992
影响因子：
1.4
通讯作者：
J. Shaw
中科院分区：
文献类型：
--
作者：
T. Fisher;J. Shaw
冰下融水过程通过冰碛脊和河冰底面上产生的波纹之间的形式类比来解释罗根冰碛。这一机制的Rogen冰碛形成是兼容的融水假说的鼓。一个统一的解释罗根冰碛和鼓是有吸引力的和必要的，因为它们是一个连续体的一部分。在纽芬兰阿瓦隆半岛的罗根冰碛上对融水假说进行了检验。地图显示，冰和融水从圣玛丽湾向东北方向流动，并在半岛呈扇形散开。四个冰碛脊和一个冰碛丘的沉积学有利于冰下洞穴的沉积。海脊中的沉积物只移动了很短的距离，有大量证据表明泥石流造成了水的分类和沉积。脊内的层理与表面坡度一致，碎屑结构与当地的形态有关，而不是区域冰流方向。Qu的其他沉积观测...
Rogen moraine is explained by subglacial meltwater processes through a form analogy between moraine ridges and ripples produced on the underside of river ice. This mechanism for Rogen moraine formation is compatible with the meltwater hypothesis for drumlins. A unified explanation for Rogen moraines and drumlins is attractive and necessary because they are part of a continuum. The meltwater hypothesis is tested on Rogen moraine of the Avalon Peninsula, Newfoundland. Mapping shows that ice and meltwater flowed northeastwards from St. Mary's Bay and fanned out across the peninsula. The sedimentology of four moraine ridges and one moraine hummock favours deposition in subglacial cavities. Sediment in the ridges travelled only short distances, and there is abundant evidence of water sorting and deposition from debris flows. Bedding within ridges conforms with surface slopes, and clast fabrics relate to local morphology rather than to the regional ice-flow direction. Additional sedimentary observations from Qu...