Quaternary sequence framework and sedimentary evolution of Qiongzhou Straits

doi:10.13745/j.esf.sf.2024.2.2

Abstract

Abstract:

To explore the Quaternary stratigraphic structure and sedimentary evolution process in the Qiongzhou Strait area, the 1140 km high-resolution single-channel seismic profile and 5 borehole core data in the Qiongzhou Strait were interpreted, and combined with grain size analysis, ¹⁴C dating, optically stimulated luminescence dating and microfossil analysis, the characteristics of seismic facies and sedimentary environment were described, and stratigraphic division and correlation were carried out to analyze the variation law of sedimentary environment. The results show that a total of 8 seismic reflection interfaces have been identified on the single seismic section, which are divided into 6 sets of seismic sequences. The overall Quaternary sediment in the Qiongzhou Strait is characterized by “thick in the west and thin in the east”, mainly distributed in the eastern and western mouths of the strait and on the slopes on both sides of the strait. The deepwater area in the central part of the strait has been almost completely eroded by strong currents. Due to frequent fluctuations in sea level, neotectonic movements, and strong hydrodynamic forces, the Quaternary sedimentary environment in the Qiongzhou Strait has undergone complex changes: multiple intercontinental sedimentations occurred during the early and middle Pleistocene periods; during the late Pleistocene, there was a significant interaction between the sea and land in the western part of the strait, while shallow sea deposits dominated the eastern part; several sedimentary hiatuses also occurred during the transgression of the Holocene period.

Key words: Qiongzhou Strait, Quaternary, sequence framework, sedimentary evolution

CLC Number:

CHEN Fei, ZENG Weite, TONG Changliang, ZHANG Congwei, FU Biao, CHEN Yang, CHEN Bo. Quaternary sequence framework and sedimentary evolution of Qiongzhou Straits[J]. Earth Science Frontiers, 2024, 31(3): 100-112.

Figures/Tables 13

Fig.1 Regional geology and actual material map of Qiongzhou Strait. Adapted from [29-30].

Fig.2 Comparison of typical boreholes formations in Qiongzhou Strait

Fig.3 Seismic profile and interpretation through the boreholes BKY1 and BKY2

Fig.4 Seismic interpretation profile through the AZK17 borehole

Fig.5 Isopach map of Quaternary strata in the study area

Fig.6 Distribution characteristics of foraminifera in BKY1 hole

Fig.7 Distribution characteristics of foraminifera in BKY2 hole

Fig.8 Distribution characteristics of foraminifera in AZK17 hole

Fig.9 Lithologic column and sedimentary facies of the AZK17 borehole

Fig.10 Seismic interpretation of the survey line L1

Fig.11 Seismic interpretation of the survey line Z10

Fig.12 Depth map of the Quaternary bottom boundary (T4) in study area

Fig.13 Single-channel seismic profiles at different locations in Qiongzhou Strait

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