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首页> 外文期刊>Michigan Academician >The History of Dune Growth and Migration along the Southeastern Shore of Lake Michigan: A Perspective from Green Mountain Beach
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The History of Dune Growth and Migration along the Southeastern Shore of Lake Michigan: A Perspective from Green Mountain Beach

机译：密歇根湖东南岸沙丘生长和迁移的历史：绿色山滩的视角

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Mapping of paleosols exposed on dune faces has been combined with radiocarbon ages from these soils and optically stimulated luminescence (OSL) ages from sand below the modern surface in order to reconstruct the geomorphic history of the dune complex at Green Mountain Beach, 10 km southwest of Holland, Michigan, The first eoiian deposition formed low, broad dunes about 5500 B.P. that roughly coincided with the Nipissing Ⅰ high in Lake Michigan water levels. A period of eolian deposition over a broad area, extending at least a kilometer inland, ended about 4,000 B.P. with the stabilization of the modem surface of the backdunes. This dune building activity coincided with the rise to and then the fall from the Nipissing Ⅱ high in lake-levels. After this time dune growth and migration were confined to a narrower zone closer to shore. The geometries of paleosols in the massive parabolic dunes indicate that this activity involved the inland migration of parabolic dunes during a period of net beach recession. Early dune growth and migration in the massive parabolic dunes is represented by the soils of The Lower Entisol (A/C horizonation) Series. These are overlain by a paleo-Inceptisol with a better developed A/E/B_s/BC/C horizonation that represents a period of extended stability in the dunes. This period of stability appears to have begun and ended at somewhat different times in different places within the Green Mountain Beach dune complex but lasted at least 1,500 years. The geometry of the paleo-Inceptisol indicates that by the beginning of this period the massive parabolic dunes had reached essentially their present height (up to 60 m above current lake levels). The paleoTnceptisol was buried during a period of remobilization that began as early as 1,000 B.P. in some places but did not begin until 500-300 B.P. in most areas. The soils of the Upper Entisol Series represent brief periods of stability during this period of dune mobility that continues today.
机译：沙丘表面暴露的古土壤的制图与这些土壤的放射性碳年龄和现代地表以下沙子的光学激发发光（OSL）年龄相结合，以重建位于西南10公里处的格林山海滩沙丘复合体的地貌史。荷兰，密歇根州，第一个风土沉积形成了约5500 BP的低宽沙丘这与密歇根湖水位高的NipissingⅠ相吻合。一段广泛的风沙沉积期（至少向内陆延伸一公里）结束了大约4,000 B.P.借助后端网的调制解调器表面的稳定。沙丘的建造活动与湖面NipissingⅡ高处的上升和下降相吻合。此后，沙丘的生长和迁移被限制在靠近海岸的较窄区域。大规模抛物线沙丘中的古土壤几何结构表明，这种活动涉及到净海滩衰退期间抛物线沙丘的内陆迁移。大块的抛物线形沙丘中早期沙丘的生长和迁移以较低的Entisol（A / C层位）系列土壤为代表。这些被古Inceptisol覆盖，具有更好的A / E / B_s / BC / C层位，代表了沙丘中一段稳定的时期。这段稳定时期似乎在绿色山滩沙丘综合体的不同地方的开始和结束时间有所不同，但至少持续了1500年。古伊诺固醇的几何形状表明，到这一时期开始，块状抛物线沙丘已基本达到其目前的高度（比目前的湖泊水平面高出60 m）。古特奈醇是在公元前1000年开始的复员时期埋葬的。在某些地方，但直到公元前500-300年才开始在大多数地区。上层Entisol系列的土壤代表着沙丘流动性的短暂稳定时期，这一时期一直持续到今天。

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