Postglacial Recession of Niagara Falls in Relation to the Great Lakes
Postglacial Recession of Niagara Falls in Relation to the Great Lakes
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尼亚加拉瀑布冰期后衰退与五大湖的关系
DOI：
10.1006/qres.1994.1050
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发表时间：
1994
影响因子：
2.3
通讯作者：
Gary Asselin
中科院分区：
文献类型：
--
作者：
K. Tinkler;J. Pengelly;W. G. Parkins;Gary Asselin
冰后期尼亚加拉大峡谷内尼亚加拉福尔斯的消退历史一直是本世纪的研究热点。蛤贝壳的放射性碳年龄表明，尼亚加拉福尔斯在10,500年至5500年的B. P.期间，当时上五大湖的水绕过伊利湖，通过安大略北湾的出口流入渥太华河。在此之前，河流的排放和衰退率与现在相似，在5200年B. P.之后恢复了相似的速率。现在的峡谷是威斯康星州尼亚加拉河（St. Davids Gorge）晚期前的一个埋藏峡谷。来自挖掘掩埋的山谷填充物的沉积物可能作为一个独特的标志层存在于安大略湖西南部的沉积物中。
Abstract The recessional history of Niagara Falls in the present Niagara Gorge during the postglacial period has been a focus of study throughout this century. Radiocarbon ages of clam shells suggest that Niagara Falls migrated very slowly around the narrowed gorge section at Niagara Glen from 10,500 to 5500 yr B.P., when upper Great Lakes water bypassed Lake Erie and flowed to the Ottawa River via the outlet at North Bay, Ontario. Prior to that interval, river discharge and recession rates were similar to those at present, and similar rates resumed after 5200 yr B.P. By about 4500 yr B.P., the present gorge had intersected a buried gorge of the pre-late Wisconsinan Niagara River (St. Davids Gorge). The sediment derived from the excavated buried valley fill may be present as a distinct marker horizon in the sediments in southwestern Lake Ontario.