Integrated stratigraphic studies of Paleocene–lowermost Eocene sequences, New Jersey Coastal Plain: Evidence for glacioeustatic control
Integrated stratigraphic studies of Paleocene–lowermost Eocene sequences, New Jersey Coastal Plain: Evidence for glacioeustatic control
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新泽西沿海平原古新世-始新世最低层序列的综合地层研究：冰川稳定控制的证据
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发表时间：
2010
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通讯作者：
J. Wright
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作者：
Ashley D. Harris;K. Miller;J. Browning;P. Sugarman;R. Olsson;B. S. Cramer;J. Wright
[1]我们描述了七个古新世至最低始新世的序列在岛海滩，巴斯河，安科拉，米尔维尔，和海格特，新泽西州的岩心孔（大洋钻探计划腿150 X，174 AX）和分析底栖有孔虫组合，以评估序列内的古深度变化。这些序列被称为Pa 0、Pa 1a、Pa 1b、Pa 2a、Pa 2b、Pa 3a和Pa 3b。古新统层序界面由底栖有孔虫生物相的不整合面和变化来识别。我们使用Q型因子分析和古坡度建模，以确定三个不同的中，外浅海底栖有孔虫组合和相关的水深。古新世早期的古深度和Pa 0、Pa 1a和Pa 2b的沉积深度为1.80 m，层序边界上的变化为1.20 m。一个长期的变浅发生在晚古新世，在Pa 3a的古深度为50-70米。这一趋势在始新世最早期发生了急剧变化，层序Pa 3b的古深度为120-150 m。新泽西古新世层序边界与其他地区的层序边界以及深海δ 18 O的增加相关，表明古新世海平面升降低潮与冰生长事件有关。
[1] We describe seven Paleocene to lowermost Eocene sequences in core holes at Island Beach, Bass River, Ancora, Millville, and Sea Girt, NJ (Ocean Drilling Program Leg 150X, 174AX) and analyze benthic foraminiferal assemblages to assess paleodepth changes within sequences. These sequences are referred to as Pa0, Pa1a, Pa1b, Pa2a, Pa2b, Pa3a, and Pa3b. Paleocene sequence boundaries are identified by unconformities and variations in benthic foraminiferal biofacies. We used Q-mode factor analysis and paleoslope modeling to identify three distinct middle-outer neritic benthic foraminiferal assemblages and their associated water depths. Paleodepths during the early Paleocene and deposition of Pa0, Pa1a, and Pa2b were ∼80 m with ∼20 m changes across sequence boundaries. A long-term shallowing occurred through the late Paleocene where paleodepths were ∼50–70 m in Pa3a. This trend drastically changes in the earliest Eocene where the paleodepths of sequence Pa3b were ∼120–150 m. New Jersey Paleocene sequence boundaries correlate with those in other regions and with δ18O increases in the deep sea, suggesting Paleocene eustatic lowerings were associated with ice-growth events.