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Chronology of Laurentide glaciation in New Jersey and the New York City area, United States
Quaternary Research ( IF 2.3 ) Pub Date : 2020-10-08 , DOI: 10.1017/qua.2020.71
Scott D. Stanford , Byron D. Stone , John C. Ridge , Ron W. Witte , Richard R. Pardi , Gerda E. Reimer

Deposits of at least three glaciations are present in New Jersey and the New York City area. The oldest deposits are magnetically reversed. Pollen and stratigraphic relations suggest that they are from the earliest Laurentide advance at ~2.4 Ma. Deposits of a second advance are overlain by peat dated to 41 ka and so are pre-Marine Isotope Stage (pre-MIS) 2. Their relation to marine deposits indicates that they predate MIS 5 but postdate MIS 11 and may postdate MIS 7 or 9, suggesting an MIS 6 age. The most recent deposits are of MIS 2 (last glacial maximum [LGM]) age. Radiocarbon dates and varve counts tied to glacial-lake events indicate that LGM ice arrived at its terminus at 25 ka, stood at the terminus until ~24 ka, retreated at a rate of 80 m/yr until 23.5 ka, and then retreated at a rate of 12 m/yr to 18 ka. At 18 ka the retreat record connects to the base of the North American Varve Chronology at Newburgh, New York. The 25–24 ka age for the LGM is slightly younger than, but within the uncertainty of, cosmogenic ages; it is significantly older than the oldest dated macrofossils in postglacial deposits in the region.

中文翻译:

美国新泽西州和纽约市地区的劳伦泰冰川年表

新泽西州和纽约市地区至少存在三个冰川沉积物。最古老的矿床被磁性反转。花粉和地层关系表明它们来自最早的约 2.4 Ma 的 Laurentide 推进。第二次推进的沉积物被 41 ka 的泥炭覆盖,海洋前同位素阶段 (pre-MIS) 2 也是如此。它们与海洋沉积物的关系表明它们早于 MIS 5,但晚于 MIS 11,并且可能晚于 MIS 7 或 9 ,表明 MIS 6 岁。最近的沉积物是 MIS 2(末次盛冰期 [LGM])年龄。与冰川湖事件相关的放射性碳日期和 varve 计数表明,LGM 冰在 25 ka 到达其终点,在终点站直到 ~24 ka,以 80 m/yr 的速度后退到 23.5 ka,然后以 23.5 ka 的速度后退速率为 12 m/yr 至 18 ka。在 18 ka 时,撤退记录连接到纽约纽堡的北美 Varve 年表的基地。LGM 的 25-24 ka 年龄略小于宇宙成因年龄,但在不确定性范围内;它比该地区冰后沉积物中最古老的大型化石要古老得多。
更新日期:2020-10-08
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