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首页> 外文期刊>Journal of Paleolimnology >Big lake records preserved in a little lake’s sediment: an example from Silver Lake, Michigan, USA
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Big lake records preserved in a little lake’s sediment: an example from Silver Lake, Michigan, USA

机译：大湖记录保存在小湖的沉积物中：以美国密歇根州银湖为例

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摘要

We reconstruct postglacial lake-level history within the Lake Michigan basin using soil stratigraphy, ground-penetrating radar (GPR), sedimentology and 14C data from the Silver Lake basin, which lies adjacent to Lake Michigan. Stratigraphy in nine vibracores recovered from the floor of Silver Lake appears to reflect fluctuation of water levels in the Lake Michigan basin. Aeolian activity within the study area from 3,000 years (cal yr. B.P.) to the present was inferred from analysis of buried soils, an aerial photograph sequence, and GPR. Sediments in and around Silver Lake appear to contain a paleoenvironmental record that spans the entire post-glacial history of the Lake Michigan basin. We suggest that (1) a pre-Nipissing rather than a Nipissing barrier separated Silver Lake basin from the Lake Michigan basin, (2) that the Nipissing transgression elevated the water table in the Silver Lake basin about 6,500 cal yr. B.P., resulting in reestablishment of a lake within the basin, and (3) that recent dune migration into Silver Lake is associated with levels of Lake Michigan.
机译：我们利用土壤地层学，探地雷达（GPR），沉积学和来自与密歇根湖相邻的Silver Lake盆地的14 C数据，重建了密歇根湖盆地内的冰川后湖平面历史。从银湖底采出的九个颤动岩心的地层学似乎反映了密歇根湖盆地水位的波动。根据对埋藏土壤的分析，航空照片序列和GPR，可以推断出研究区域从3,000年（公历年）至今的风沙活动。银湖及其周围地区的沉积物似乎包含一个古环境记录，涵盖了密歇根湖盆地整个冰川后的历史。我们建议（1）先行尼皮斯山脉而不是尼皮斯山脉屏障将银湖盆地与密歇根湖盆地分隔开；（2）尼皮斯海峡的侵扰使银湖盆地的地下水位升高了大约6,500年。 B.P.，导致盆地内湖的重建，以及（3）最近沙丘迁移到银湖与密歇根湖水位有关。

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