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沉积学报  2015 

珠江口外海域与珠江三角洲晚更新世以来的地层层序对比

DOI: 10.14027/j.cnki.cjxb.2015.04.010, PP. 713-723

Keywords: 珠江口外海域,单道地震剖面,层序地层,海平面变化

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Abstract:

本文综合运用珠江三角洲外南海北部陆架的地震测线和三角洲地区的钻孔资料进行联合解译,获得由浅海至陆地的层序地层剖面,辨识出三角洲地区4套地层层序和南海北部陆架6套地层层序及体系域,前者仅记录了2个沉积旋回和相应的2次海面变化,而后者记录了更多沉积旋回及相应的海平面波动.在海、陆层序对接和对比的基础上,文章重点把南海北部陆架6套地层层序与深海氧同位素阶段MIS6~MIS1进行了对比分析,认为珠江三角洲下旋回与南海北部陆架层序D相当,珠江三角洲下旋回对应着南海北部陆架MIS6~MIS5(距今15万年~8万年)时代的层序地层,MIS4~MIS2末次冰期低海面时期的三角洲沉积位于现今南海北部陆架之上,并未向北延伸到现代珠江三角洲地区.珠江三角洲和南海北部陆架的下沉都是南海陆缘扩张的表现.

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