Provenance of the Eocene-Miocene sediments in the Baiyun Sag, Pearl River Mouth Basin

HOU Yuanli; SHAO Lei; QIAO Peijun; CAI Guofu; PANG Xiong; ZHANG Daojun

doi:10.16562/j.cnki.0256-1492.2019012501

2020 Vol. 40, No. 2

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HOU Yuanli, SHAO Lei, QIAO Peijun, CAI Guofu, PANG Xiong, ZHANG Daojun. Provenance of the Eocene-Miocene sediments in the Baiyun Sag, Pearl River Mouth Basin[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 19-28. doi: 10.16562/j.cnki.0256-1492.2019012501

Citation:

HOU Yuanli, SHAO Lei, QIAO Peijun, CAI Guofu, PANG Xiong, ZHANG Daojun. Provenance of the Eocene-Miocene sediments in the Baiyun Sag, Pearl River Mouth Basin[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 19-28. doi: 10.16562/j.cnki.0256-1492.2019012501

Provenance of the Eocene-Miocene sediments in the Baiyun Sag, Pearl River Mouth Basin

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
CNOOC Ltd.-Shenzhen Co., Shenzhen 518064, China
3.
CNOOC Ltd.-Zhanjiang Co., Zhanjiang 524057, China

More Information

Corresponding author: SHAO Lei, lshao@tongji.edu.cn

Received Date: 25 January 2019

Revised Date: 15 July 2019

Publish Date: 25 April 2020

Abstract

Abstract

Using both geological and geophysical methods, this paper aims to study the evolutionary and depositional features of the Baiyun Sag, Pearl River Mouth Basin, the Northern South China Sea. The results show that during the period of Early-Middle Eocene, the Baiyun Sag was prevailed by a transition from alluvial fan to deep lake facies, with marine transgression sometimes in late Eocene. The sediments are mainly sourced from the Panyu Lower Uplift and the Shenhu Plateau. In Early Oligocene, the study area turned gradually to transitional and marine environment. Provenances in the north part of the sag were controlled by the Panyu Lower Uplift, while the sag was mainly filled with sediments from the western SCS through “Kontum- Ying-Qiong” Rivers. The Pearl River started exerting influence on the north part of the sag in Late Oligocene as it passed over the Panyu Lower Uplift, and the rest parts of the sag were controlled by double sources from both the “Kontum-Ying-Qiong” River and the Pearl River. Since Miocene, the water depth constantly increased due to the southward jumping of slope break and increase in basin subsidance, which resulted in the fully domination of ancient Pearl River sediment and the complete transformation of the southern part into deep water environment. The southern part of the sag since then has been influenced by the mixed sedimentation of turbidity current with terrigenous and oceanic sediments.
- sedimentary environment /
- source evolution /
- zircon U-Pb /
- Baiyun Sag /
- South China Sea

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References

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