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首页> 外文期刊>Michigan Academician >Lake Level Variability in Silver Lake, Michigan: A Response to Fluctuations in Lake Levels of Lake Michigan
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Lake Level Variability in Silver Lake, Michigan: A Response to Fluctuations in Lake Levels of Lake Michigan

机译：密歇根州银湖的湖水位变化：对密歇根湖水位波动的响应

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Sediment from Silver Lake, Michigan, can be used to constrain the timing and elevation of Lake Michigan during the Nipissing transgression. Silver Lake is separated from Lake Michigan by a barrier/dune complex and the Nipissing, Calumet, and Glenwood shorelines of Lake Michigan are expressed landward of this barrier. Two Vibracores were taken from the lake in February 2000 and contain pebbly sand, sand, buried soils, marl, peat, and sandy muck. It is suggested here that fluctuations in the level of Lake Michigan are reflected in Silver Lake since the Chippewa low phase, and possibly at the end of the Algonquin phase. An age of 12,490 B.P. (10,460+-50 ~(14)C yrs B.P.) on wood from a buried Entisol may record the falling Algonquin phase as the North Bay outlet opened. A local perched water table is indicated by marl deposited before 7,800 B.P. and peat between 7,760-7,000 B.P. when Lake Michigan was at the low elevation Chippewa phase. Continued deepening of the lake is recorded by the transition from peat to sandy muck at 7,000 B.P. in the deeper core, and with the drowning of an Inceptisol nearly 3 m higher at 6,410 B. P. in the shallower core. A rising groundwater table responding to a rising Lake Michigan base level during the Nipissing transgression, rather than a response to mid-Holocene climate change, explains deepening of Silver Lake. Sandy muck was deposited continually in Silver Lake between Nipissing and modern time. Sand lenses within the muck are presumed to be eolian in origin, derived from sand dunes advancing into the lake on the western side of the basin.
机译：在Nipissing海侵期间，来自密歇根州银湖的沉积物可用于限制密歇根湖的时间和海拔。银湖与密歇根湖之间由屏障/沙丘复合体隔开，密歇根湖的尼皮辛，卡卢梅特和格伦伍德海岸线被表示为该屏障的陆地。 2000年2月从湖中采集了两个Vibracore，其中包含卵石状的沙子，沙子，埋入的土壤，泥灰岩，泥炭和沙土。在此建议，从奇珀瓦低水位期开始，并且可能在阿尔冈金相结束时，银湖反映出密歇根湖水位的波动。公元前12,490岁（北太平洋10,460 + -50〜（14）C yrs B.P.）在北湾出口打开时，可能会记录掉掉的Algonquin相。在公元前7,800年之前沉积的泥灰岩指示了当地栖息的地下水位。泥炭在公元前7,760-7,000年之间当密歇根湖处于低海拔奇珀瓦阶段时。从7,000 B.P.开始的泥炭到沙渣的转变记录了湖泊的不断加深。在较深的岩心中淹没了Inceptisol，在6,410 B. P.处淹没了将近3 m。银湖的深化解释说，地下水位上升是对尼皮辛海侵过程中密歇根湖水位上升的反应，而不是对全新世中期气候变化的反应。在Nipissing与近代之间，桑迪渣土不断沉积在银湖中。推测渣土内部的沙晶起源于风沙，源自沙丘进入盆地西侧的湖泊。

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