| Citation: | CHEN Yue，ZHANG Jianxin，WANG Li，et al. Reconstruction of source-sink system and sand control mechanisms in continental faulted lake basins: A case study of the First Member of the Wenchang Formation in the Wenchang Sag of the Pearl River Mouth Basin[J]. Bulletin of Geological Science and Technology，2025，44（4）：273-287 doi: 10.19509/j.cnki.dzkq.tb20250087
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Controlled by complex factors such as basin structure, climate, and water depth, the quantitative reconstruction of source-sink systems, sand transport pathways, and sedimentation processes in rifting lacustrine basins remains a persistent challenge. This study addresses this knowledge gap by investigating the First Member of the Wenchang Formation in the Wenchang Sag of the western Pearl River Mouth Basin.
Key elements of the source-sink system are quantitatively analyzed through methods including the restoration of lithology and geomorphology in the provenance area, characterization of paleo-valleys, recognition of fault boundary patterns, and determination of sedimentary body types and scales. The coupling relationships between these elements are then discussed.
The results show that the deposition of the First Member of the Wenchang Formation was dominated by fan delta, braided river delta, and shore-shallow lacustrine deposits. The bedrock types of the provenance area are primarily magmatic and sedimentary rocks, with seven provenance systems identified. Four sand control mechanisms within the source-sink system are recognized, and a total of 37 paleo-valleys are identified. In the steep slope zone, sedimentary sand bodies show the closest correlation with elevation difference, watershed area, and cross-sectional area of the valley. In contrast, the ramp zone exhibits the strongest correlation with watershed area, valley length, and cross-sectional area of the valley.
These findings provide a basis for describing sedimentary systems in continental rifting lacustrine basins.
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