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首页> 外文期刊>Boreas >The Early Lake Ontario barrier beach: evidence for sea level about 12.8-12.5 cal. ka BP beneath western Lake Ontario in eastern North America
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The Early Lake Ontario barrier beach: evidence for sea level about 12.8-12.5 cal. ka BP beneath western Lake Ontario in eastern North America

机译：安大略湖湖泊堡海滩：海平面的证据约为12.8-12.5 Cal。 北美洲西部湖湖BPP

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An overstepped, concave-eastward, barrier beach beneath Holocene mud in western Lake Ontario has been delineated by acoustic and seismic reflection profiles and piston cores, and related to Early Lake Ontario (ELO). The average ELO barrier depth below present mean lake level is 77.4 to 80.6 m, or about -6 to -2.8 m above present sea level. Trend surface analysis of Champlain Sea (Atlantic Ocean) marine limits defined the contemporaneous marine water surface, and projections of this surface pass similar to 25 m above the outlet sill of the Lake Ontario basin and extend to the ELO palaeo-barrier, a unique sand and gravel deposit beneath western Lake Ontario. ELO was connected to the Champlain Sea above the isostatically rising outlet sill for up to three centuries after about 12.8 cal. ka BP, while the glacio-isostatically depressed St. Lawrence River Valley was inundated by the Atlantic Ocean. During the period of this connection, ELO level was confluent with slowly rising sea level, and the lake constructed a transgressive beach deposit with washover surfaces. ELO remained fresh due to a high flux of meltwater inflow. The marine water level connection stabilized water level in ELO relative to its shore and facilitated shore erosion, sediment supply and barrier construction. Glacio-isostatic uplift of the outlet sill, faster than sea-level rise, lifted ELO above the Champlain Sea about 12.5 cal. ka. Shortly after, a hydrological deficit due mainly to a combination of diverted meltwater inflow and dry climate, well known from regional pollen studies, forced the lake into a lowstand. The lowstand stranded the barrier, which remains as evidence of sea level, the farthest inland in eastern North America north of the Gulf of Mexico at the time. The highest palaeo-washover surface provides a sea-level index point.
机译：在安大略省西部湖中全新世泥下方的超越，凹面，东部的障碍海滩被声学和地震反射曲线和活塞核心划清，并与早期安大略湖（ELO）有关。低于当前平均湖泊水平的平均ELO屏障深度为77.4至80.6米，或约-6至-2.8米以上，上方海平面。尚普兰海（大西洋）海洋限制的趋势表面分析定义了同类海水水面，并将这种表面通道的突起相似至安大略湖池湖的出口距离，延伸到Elo Palaeo-Barrier，独特的沙子在安大略省西湖下面的碎石沉积物。在大约12.8次CAL后，ELO在等静脉上升的出口窗口上方连接到尚多稳定的出口窗台。 KA BP，而Glacio-Osostaved郁闷的圣劳伦斯河谷被大西洋淹没。在这一联系期间，ELO水平与海平面慢慢上升的汇合，湖泊建造了一个带有盥洗垫的近近海滩矿床。由于熔融流入高通量，ELO仍然是新鲜的。海水水位连接稳定水位，相对于其岸边，促进岸孔侵蚀，泥沙供应和障碍施工。出口窗台的Glacio-iSostatic隆起，比海平面上升快，倒产镜海上的ELO升起约12.5克。 K a。不久之后，水文缺陷主要是由于转移的熔融流入和干燥气候的组合，从区域花粉研究中闻名，迫使湖泊陷入低位。低地搁浅了障碍，这仍然是海拔的证据，即在墨西哥湾东部的东北最远的内陆。最高的Palaeo-Wakeover表面提供了海平面指数点。

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  • 来源
    《Boreas》 |2019年第1期|共20页
  • 作者

    Lewis C. F. Michael; Todd Brian J.;

  • 作者单位

    Geol Survey Canada Atlantic Nat Resources Canada 1 Challenger Dr POB 1006 Dartmouth NS B2Y 4A2 Canada;

    Geol Survey Canada Atlantic Nat Resources Canada 1 Challenger Dr POB 1006 Dartmouth NS B2Y 4A2 Canada;

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  • 中图分类 历史地质学、地层学;
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