Evidence for ice-calving at the terminus of a Laurentide ice stream from multichannel seismic reflection data, Oneida Lake, NY
Evidence for ice-calving at the terminus of a Laurentide ice stream from multichannel seismic reflection data, Oneida Lake, NY
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来自纽约州奥奈达湖多道地震反射数据的劳伦泰冰流终点处冰崩解的证据
DOI：
10.1017/qua.2021.53
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发表时间：
2021
影响因子：
2.3
通讯作者：
Scholz, C.A.
中科院分区：
文献类型：
--
作者：
Zaremba, N.;Scholz, C.A.
北美安大略低地和莫霍克河谷的冰消记录对于约束劳伦泰德冰盖的退缩历史、更新世末期古气候和冰盖过程具有重要意义。莫霍克山谷是最后一次冰消期的一条重要融水排泄路线，现代奥奈达湖周围的地区是融水排入北大西洋的阀门。莫霍克山谷在最后一次冰消期被奥奈达冰瓣和奥奈达冰流占据。多道地震反射数据可用于生成冰前表面和冰床和冰前湖泊沉积物的内部结构的图像，从而有助于冰消作用的研究。本文利用217公里的海上多道地震反射数据，对奥奈达盆地的整个第四纪剖面进行成像。一个冰前湖和古冰解边缘的解释，这可能加速了奥奈达冰流，导致在湖的西部观察到细长的床型。在这项研究中确定的冰川床型被冰前湖沉积物所掩埋，表明奥奈达盆地包含冰川融水过程的记录，包括奥奈达湖东部60米厚的冰前间隔。
The deglaciation record of the Ontario Lowland and Mohawk Valley of North America is important for constraining the retreat history of the Laurentide Ice Sheet, end-Pleistocene paleoclimate, and ice-sheet processes. The Mohawk Valley was an important meltwater drainage route during the last deglaciation, with the area around modern Oneida Lake acting as a valve for meltwater discharge into the North Atlantic Ocean. The Mohawk Valley was occupied by the Oneida Lobe and Oneida Ice Stream during the last deglacial period. Multichannel seismic reflection data can be used to generate images of preglacial surfaces and internal structures of glacial bedforms and proglacial lake deposits, thus contributing to studies of deglaciation. This paper uses 217 km of offshore multichannel seismic reflection data to image the entire Quaternary section of the Oneida basin. A proglacial lake and paleo-calving margin is interpreted, which likely accelerated the Oneida Ice Stream, resulting in elongated bedforms observed west of the lake. The glacial bedforms identified in this study are buried by proglacial lake deposits, indicating the Oneida basin contains a record of glacial meltwater processes, including a 60-m-thick proglacial interval in eastern Oneida Lake.