U–Pb detrital zircon ages from late Eocene to early Oligocene Pinghu formation of the East China Sea Shelf Basin: Inferences on synergistic effects between East Asia offshore sedimentation and major rivers supply

Zhao，Qian1; Zhu，Hongtao2,3; Zou，Wei4; Qin，Lanzhi4; Liu，Qianghu2,3

2024-04-01

10.1016/j.marpetgeo.2024.106739

Marine and Petroleum Geology   影响因子和分区

0264-8172

Our understanding of the late Eocene to early Oligocene provenance evolution of the East China Sea Shelf Basin has been limited, which hampers our study of the synergistic effects between East Asia offshore sedimentation and major rivers. To address this, we compared newly acquired detrital zircon chronological data from the East China Sea with published detrital U–Pb ages of major rivers in East Asia. Through this analysis, we have been able to reconstruct the provenance changes of sediments in the East China Sea during this crucial period. We have identified two large-scale and three small-scale denudation surfaces that developed in the Pinghu and lower Huagang Formations. These surfaces indicate that sediments were also derived from underlying strata and bedrock, particularly in the lower Pinghu and lower Huagang Formations. The newly acquired detrital zircon U–Pb age range was found to be roughly similar, ranging from 36.2 ± 0.7 to 2954.0 ± 30.3 Ma. The age peaks of the lower Pinghu Formation were more consistent, while the middle, upper Pinghu Formation, and lower Huagang Formation exhibited multiple age peaks. Comparing the compiled zircon U–Pb age peaks of the Chuanjiang segment of the upper Yangtze River with those of the East China Sea Shelf Basin, we found relative similarity. Additionally, the younger zircon grains with ages <500 Ma in the east Cathaysia catchment showed similarities with the East China Sea Shelf Basin. In terms of provenance contribution, the sediments of the lower Pinghu Formation were predominantly provided by the adjacent uplifts in the east Cathaysia catchment, with the Chuanjiang segment also playing a significant role. From the middle Pinghu Formation onwards, the provenance from the Chuanjiang segment became dominant, accounting for over 90 % of the sediments. However, this influence was limited to the northern part of the study area. This suggests a substantial increase in the Yangtze River catchment during this period, potentially related to the complete connection of the modern Yangtze River.

Detrital zircon U–Pb dating East China sea Modern yangtze river Pinghu formation Strata denudation

SCI ; EI

英语

第一 ; 通讯

GEOSCIENCES

2-s2.0-85183979371

Scopus

1.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
2.Key Laboratory of Tectonics and Petroleum Resources,China University of Geoscience,Ministry of Education,Wuhan,430074,China
3.School of Earth Resources,China University of Geosciences,Wuhan,430074,China
4.Shanghai Branch of CNOOC Ltd.,Shanghai,200335,China

Zhao，Qian,Zhu，Hongtao,Zou，Wei,等. U–Pb detrital zircon ages from late Eocene to early Oligocene Pinghu formation of the East China Sea Shelf Basin: Inferences on synergistic effects between East Asia offshore sedimentation and major rivers supply[J]. Marine and Petroleum Geology,2024,162.

Zhao，Qian,Zhu，Hongtao,Zou，Wei,Qin，Lanzhi,&Liu，Qianghu.(2024).U–Pb detrital zircon ages from late Eocene to early Oligocene Pinghu formation of the East China Sea Shelf Basin: Inferences on synergistic effects between East Asia offshore sedimentation and major rivers supply.Marine and Petroleum Geology,162.

Zhao，Qian,et al."U–Pb detrital zircon ages from late Eocene to early Oligocene Pinghu formation of the East China Sea Shelf Basin: Inferences on synergistic effects between East Asia offshore sedimentation and major rivers supply".Marine and Petroleum Geology 162(2024).