Late Pleistocene Sea level on the New Jersey Margin: Implications to eustasy and deep-sea temperature
Late Pleistocene Sea level on the New Jersey Margin: Implications to eustasy and deep-sea temperature
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DOI：
10.1016/j.gloplacha.2008.03.013
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发表时间：
2009-03
影响因子：
3.9
通讯作者：
J. Wright;R. Sheridan;K. Miller;J. Uptegrove;B. S. Cramer;J. Browning
中科院分区：
文献类型：
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作者：
J. Wright;R. Sheridan;K. Miller;J. Uptegrove;B. S. Cramer;J. Browning
我们根据新泽西边缘的层序地层学收集了晚更新世的海平面记录，并对其进行了年代测定，并将其与新几内亚、巴巴多斯和荒木岛的化石隆起的珊瑚礁的公开记录进行了比较，并将其与红海同位素值的标度估算的综合海平面进行了比较。放射性碳定年、氨基酸外消旋数据和叠加限制了新泽西州大（20-80 m）海平面下降的年龄，这些下降与海洋同位素年代表（MIC） 2、3b、4、5b和6（过去130 kyr）相关。MIC 1、2、4、5e和6的海平面记录与新几内亚、巴巴多斯、荒木和红海的记录相似；mic3的记录之间存在一些差异。我们的记录一致地提供了MIC3的最浅海平面估计（比现在低25-60米）；它与Chappell的新几内亚记录（2002年；~ 35-70米）最为吻合，但与Araki（~ 85-95米）和红海（50-90米）提供的更深的估计形成对比。与底栖有孔虫δ18O记录的上升估计比较表明，在MIC 5e和5d （~ 120-110 ka）之间，深海冷却了~ 2.5°C，接近冻结的状态持续到终止1a （14-15 ka）。MIC 5b和MIC 2（约90-20 ka）之间的海平面变化遵循由冰生长对有孔虫δ18O值的影响预测的0.1‰/10 m线性变化。深海冷却的模式遵循先前在两种稳定运行模式之间建立的滞后回路。在过去130万年的大部分时间里，寒冷、接近冰点的深水条件是主要特征，只有两个温暖的间隔（全新世/MIC 1和MIC 5e）被打断。我们将这些变化与北方分量水（NCW）的变化联系起来。
We assembled and dated a late Pleistocene sea-level record based on sequence stratigraphy from the New Jersey margin and compared it with published records from fossil uplifted coral reefs in New Guinea, Barbados, and Araki Island, as well as a composite sea-level estimate from scaling of Red Sea isotopic values. Radiocarbon dates, amino acid racemization data, and superposition constrain the ages of large (20–80 m) sea-level falls from New Jersey that correlate with Marine Isotope Chrons (MIC) 2, 3b, 4, 5b, and 6 (the past 130 kyr). The sea-level records for MIC 1, 2, 4, 5e, and 6 are similar to those reported from New Guinea, Barbados, Araki, and the Red Sea; some differences exist among records for MIC 3. Our record consistently provides the shallowest sea level estimates for MIC3 (∼25–60 m below present); it agrees most closely with the New Guinea record of Chappell (2002; ∼35–70 m), but contrasts with deeper estimates provided by Araki (∼85–95 m) and the Red Sea (50–90 m). Comparison of eustatic estimates with benthic foraminiferal δ18O records shows that the deep sea cooled ∼2.5 °C between MIC 5e and 5d (∼120–110 ka) and that near freezing conditions persisted until Termination 1a (14–15 ka). Sea-level variations between MIC 5b and 2 (ca. 90–20 ka) follow a well-accepted 0.1‰/10 m linear variation predicted by ice-growth effects on foraminiferal δ18O values. The pattern of deep-sea cooling follows a previously established hysteresis loop between two stable modes of operation. Cold, near freezing deep-water conditions characterize most of the past 130 kyr punctuated only by two warm intervals (the Holocene/MIC 1 and MIC 5e). We link these variations to changes in Northern Component Water (NCW).