Seven sedimentary facies units A to G, in ascending order, are defined in core GS-HKT-1 (Figure 3, Supplementary Figures S1, S2). Unit A occurs at depths of 28.5–35.0 m and is very fine to fine sand ...

By analyzing the lithofacies of the carbonates and igneous rocks, the morphological features and spatial distribution patterns corresponding to these sedimentary and volcanic facies were identified.