...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Paleolimnology >A post-Calumet shoreline along southern Lake Michigan
【24h】

A post-Calumet shoreline along southern Lake Michigan

机译：密歇根湖南部沿卡卢梅特河后的海岸线

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The southern shore of Lake Michigan is the type area for many of ancestral Lake Michigan’s late Pleistocene lake phases, but coastal deposits and features of the Algonquin phase of northern Lake Michigan, Lake Huron, and Lake Superior are not recognized in the area. Isostatic rebound models suggest that Algonquin phase deposits should be 100 m or more below modern lake level. A relict shoreline, however, exists along the lakeward margin of the Calumet Beach that was erosional west of Deep River and depositional east of the river. For this post-Calumet shoreline, the elevation of basal foreshore deposits east of Deep River and the base of the scarp west of Deep River indicate a slightly westward dipping water plane that is centered at ～184 m above mean sea level. Basal foreshore elevations also indicate that lake level fell ～2 m during the development of the shoreline. The pooled mean of radiocarbon dates from the surface of the peat below post-Calumet shoreline foreshore deposits indicate that the lake transgressed over the peat at 10,560 ± 70 years B.P. Pollen assemblages from the peat are consistent with this age. The elevation and age of the post-Calumet shoreline are similar to the Main Algonquin phase of Lake Huron. Recent isostatic rebound models do not adequately address a high-elevation Algonquin-age shoreline along the southern shore of Lake Michigan, but the Goldthwait (1908) hinge-line model does.
机译：密歇根湖的南岸是许多祖先密歇根湖晚更新世湖相的典型区域，但该地区没有发现沿海沉积物和密歇根湖北部，休伦湖和苏必利尔湖的沿海阿尔贡金相。等静回弹模型表明，阿尔冈昆相沉积物应比现代湖泊水平面低100 m或更多。但是，沿着卡卢梅特海滩的湖边存在一条遗迹海岸线，该海滩位于深河以西，河东以沉积层。对于此卡卢梅特河后海岸线，深河以东的基础前滨沉积物的高程和深河以西的陡峭的底部表明水平面略微向西，其中心位于平均海平面以上184 m。基础前滨高程还表明，在海岸线发展过程中，湖泊水位下降了约2 m。放射性碳的合并平均值来自于Calumet后海岸线前岸沉积物下方的泥炭表面，表明该湖在公元前10560±70年跨过泥炭。泥炭的花粉组合与此年龄相符。卡卢梅特河后海岸线的海拔和年龄与休伦湖的主要阿尔冈金相相似。最近的等静回弹模型不能充分解决密歇根湖南岸高海拔的阿尔冈金时代的海岸线，但是Goldthwait（1908）的铰接线模型可以解决这一问题。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号