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OALib Journal期刊
ISSN: 2333-9721
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南黄海辐射沙脊群苦水洋海域晚更新世以来沉积特征及环境演化
DOI: 10.13232/j.cnki.jnju.2015.03.020
Keywords: 沉积相,钻孔对比,地层结构,沉积环境演化,苦水洋海域
Abstract:
本文通过钻孔沉积相分析和钻孔对比，辅以粒度、sr/ba环境指标和矿物分析，从下到上划分出5套沉积层序，即su1（中低潮滩→高潮滩）、su2（中低潮滩→高潮滩）、su3（洪泛平原）、su4（滨岸沼泽和潮滩）和su5（潮流沙脊-潮流通道）。钻孔对比显示，由于海侵过程中的潮流侵蚀作用，苦水洋海域的地层分布非常不均一，尤其是海侵早期地层均被侵蚀得支离破碎。结合年代地层数据，重建了苦水洋海域晚更新世以来的环境演化，除末次冰期极盛期陆地暴露以外，研究区均受潮流控制，氧同位素3阶段发育潮滩沉积，全新世高海面以来发育潮流沙脊。沙脊的频繁迁移可能是造成沙脊年龄偏轻的主要原因。晚更新世以来的海平面波动以及海侵过程中的潮流侵蚀控制了研究区的环境变化和地层结构。
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