古地理学报2024，Vol.26Issue(2)：296-307,12.DOI:10.7605/gdlxb.2024.02.014
南海北部深水区古近系沉积物源演变及古地理意义
Paleogene sediment source evolution and palaeogeographic significance in deep-water area of the northern South China Sea
摘要
Abstract
The deep-water area of the northern South China Sea experienced a transition from lacus-trine to marine environments in the Paleogene,and has rich oil and gas resources and broad exploration prospects.Due to the limitation of water depth,the provenance of sediments and the palaeogeographic evo-lution of the basin are not clear.In this paper,the Paleogene of the Zhu-2 depression in the Pearl River Mouth Basin is systematically studied by means of detrital zircon U-Pb ages and source-sink correlation.The results show that in the Early and Middle Eocene,the sediments of the Zhu-2 depression were mainly from local uplift area around the depression.In the Late Eocene,the Kunyingqiong River originated from the western side of the depression provided a large amount of sediments for the basin,whereas the Paleo-Pearl River sediments had little influence on the deposition in the depression.In the Oligocene,the Paleo-Pearl River crossed the Panyu low uplift and entered the Baiyun sag,carrying sediments mixed with the Kunyingqiong River sediments in the form of delta deposition in the north and mid-west of the sag,forming a dual provenance river-delta system.The Paleogene provenance evolution of the deep-water area of the northern South China Sea was obviously controlled by regional tectonic palaeogeography of the Mesozoic.Identifying the provenance evolution during this period is of great significance for restoring the regional palaeogeography pattern.关键词
南海/珠二坳陷/古近纪/物源/古地理Key words
South China Sea/Zhu-2 Depression/Paleogene/provenance/palaeogeography分类
天文与地球科学引用本文复制引用
向绪洪,张丽丽,鲁毅,乔培军,陈淑慧,吴梦霜,马琼,邵磊..南海北部深水区古近系沉积物源演变及古地理意义[J].古地理学报,2024,26(2):296-307,12.基金项目
国家自然科学基金项目(编号:42076066,92055203)和中海油综合科研项目"南海东部大中型天然气田勘探潜力与突破方向"联合资助.[Co-funded by National Natural Science Foundation of China Project(Nos.42076066,92055203)and CNOOC Comprehensive Scientific Re-search Project"Exploration Potential and Breakthrough Direction of large-medium sized Gas Fields in the Eastern South China Sea"] （编号:42076066,92055203）
