Citation: | WANG Lijie, YAO Yongjian, SUN Zhen, LI Fucheng, YANG Chupeng, XU Ziying. 2020. The discrimination of Mesozoic sequence and its tectonic attribute in the southeastern South China Sea[J]. Geology in China, 47(5): 1337-1354. doi: 10.12029/gc20200504 |
Discriminating the distribution of the Mesozoic strata on the southeastern South China Sea (SCS) continental margin is of great importance for understanding the SCS evolution as well as the oil and gas potential. Due to limited data constraints and varied stratigraphic system divisions, the distribution and tectonic features of the Mesozoic sequences in the southeastern SCS have remained controversial. Assisted by drilling and dredging data, the authors comprehensively identified the Mesozoic sequence using a combination of well-seismic comparison, seismic reflection characteristics, internal velocity analysis, contact relationship between igneous edifices and strata, and structural deformation characteristics. The results show that the Mesozoic sequence is characterized by parallel, continuous, and low-frequency reflections, with internal velocity of 3400-4200 m/s. As the burial depth or/and the degree of metamorphism increases, the internal velocity increases to 4500-5500 m/s. The seismic reflections of the Mesozoic strata in the depth is fuzzy, and most of them have no obvious bottom reflection. Despite the fact that the characteristics of seismic reflection are clear in a specific area, it is still difficult to make a comparative study and conduct a whole region seismic explanation because the range of the Mesozoic strata is limited. Among them, the Mesozoic strata in the Northwest, Southwest Palawan basin, Liyue and Andubei basin show low-angle tilting or nearly horizontal characteristics. By contrast, the Mesozoic strata in the northern part of Jiuzhang basin located in the southwest of Liyue have a velocity of 3500-4500 m/s, which is higher than the overlying Cenozoic velocity and coincides with the result constrained by drilling layer. In addition, the Mesozoic strata tilt or deflect at a high angle, which may be related to the emplacement of magmatic activity. Compared with the distribution of Mesozoic volcanic arc and identified igneous bodies, the authors infer that the first style Mesozoic strata are scattered in the forearc basin near volcanic arc and thus show a relatively weak tectonic activity, whereas the second style strata are distributed in the inter-arc basin and have a strong magmatic activity.
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Regional geomorphological map (after Becker et al., 2009) with tectonic locations
Mesozoic Seismic profiles in the northwest Palawan basin and Reed Bank (see Fig. 1a for location)
Internal velocities from time/ depth correlation within the two wells constructed from the corrected check shot times (Pensacosa-1, Sampaguita-1, see Fig. 1a for location)
Comparison diagram of contact relationship between igneous bodies and surrounding strata(modified from Infante, 2018; Hansen and Cartwright, 2006)
Seismic profiles across the Jiuzhang basin and the contact relationship between igneous bodies and strata
Mesozoic and Cenozoic stratigraphic combinations and filling characteristics across the Northwest and Southwest Palawan Basins
Interpretation of seismic profile and internal velocity across dredging site of SO27-21
The seismic profile (a and b), sketch tectonic-stratigraphic interpretation profile (c) and its internal velocity profile (d) across the Jiuzhang and Andubei basin
Map of reduced-to-the-pole magnetic anomaly with the inferred distribution of Mesozoic volcanic arc, Mesozoic and Cenozoic igneous bodies, and inferred Mesozoic sediment basins(after Kudrass et al., 1986; Franke et al., 2008; 2014;Chang et al., 2015; Dung et al., 2016; Li et al., 2018)
Schematic diagram of the active continental marginal structure (modified after Li et al., 2012 and 2013)