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首页> 外文期刊>Journal of Paleolimnology >Geological and geophysical evidence for pre-Nipissing (>5,000 years BP) transgression infilled valleys in the Lake Huron basin, Ontario
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Geological and geophysical evidence for pre-Nipissing (>5,000 years BP) transgression infilled valleys in the Lake Huron basin, Ontario

机译：安大略休伦湖盆地前Nipissing（> 5,000 BP）海侵充填山谷的地质和地球物理证据

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摘要

Lake Algonquin, the largest glacial lake of the Great Lakes area, ended prior to 10,000 years BP by drainage to the Ottawa Valley as the North Bay outlet was deglaciated. At that time, the outlet area was isostatically downwarped more than 100 m; resulting low water, river-linked lakes Chippewa, Stanley, and Hough, lowstands in the basins of lakes Michigan, Huron, and Georgian Bay respectively, were much below present lake level. While water levels were low, about half of the present lake area was dry land. The land above the lowstands was dissected by streams and became forested. Uplift of the North Bay outlet between 10,000 and 5,000 years BP raised lake level to above the present (the Nipissing transgression), submerging the forest and valley system. Submerged stumps from those forests have often been encountered on the present lake floor; some stumps have been dated.
机译：大湖区最大的冰川湖阿尔冈昆湖在BP 10,000年之前因北湾出口被冰冻而向渥太华谷排水而结束。当时，出口区域等静变形超过100 m；由此产生的低水位，分别与密歇根湖，休伦湖和乔治亚湾的盆地相比，与河流相连的奇珀瓦湖，斯坦利湖和霍夫湖的低水位大大低于目前的湖面水位。虽然水位低，但目前湖区的一半左右是旱地。低洼地上方的土地被溪流割开，变成了森林。在10,000年至5,000年之间，北湾出口的隆升使BP的湖面水位上升至目前（Nipissing海侵）以上，淹没了森林和山谷系统。在目前的湖面上经常会遇到这些森林淹没的树桩；一些树桩已经过时了。

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