The South China Sea: Paleoceanography and Sedimentology by Pinxian Wang, Qianyu Li

By Pinxian Wang, Qianyu Li

This publication is the 1st synthesis of sedimentary geology and paleoceanography of the South China Sea at the foundation of intensive commercial explorations and clinical expeditions culminated with the ODP Leg 184. It presents updated wisdom concerning the historical past of this greatest marginal sea within the West Pacific, deep-sea documents of evolution and adaptations of the East Asian monsoon, and geological backgrounds of the off-shore petroleum basins. With its specialise in paleoceanography and sedimentology, this quantity offers a entire all-round view of the marginal sea basin, from sleek oceanography to series stratigraphy. The South China Sea: Paleoceanography and Sedimentology is key studying for complex scholars and researchers operating in marine geology, basin evolution, sedimentology, paleoceanography and similar fields.

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Lüdmann and Wong (1999) identified two main collision phases in the northern region: 5-3 Ma and 3-0 Ma. Pliocene faults are mainly ENE-WSW to NE-SW trending and strike-slip in nature, while recent faults are generally oriented NE-SW subparallel to the syn-rift faults. Most likely, the underwater part of the Bashi Strait, now at ~2,400 m water depth, has been acting as a barrier blocking Pacific bottom waters flowing into the SCS since ~5 Ma. Therefore, the isolated SCS bottom water became colder and more corrosive, subsequently causing more severe carbonate dissolution at deep water localities (Chapter 6).

This suggests that the deep-layer circulation in the SCS is predominantly cyclonic. The intrusion of deep Pacific water is also evident in oxygen OCEANOGRAPHIC AND GEOLOGIC BACKGROUND 33 distribution used as a passive tracer (Figure 2-19D). As it spreads over the SCS, water from the Pacific gradually gets mixed with ambient waters, loses its Pacific characteristics, and returns in less dense layers. Therefore, density distributions within the sea basin suggest a cyclonic deep boundary current system, as might be expected for an overflow-driven abyssal circulation (Qu et al.

The incoming Pacific water crosses the Bashi Strait, sinks, spreads out, and fills the SCS deep basin. 8°C warmer than in the western Pacific at the same depth (Chen C. et al. 2001). Across the Bashi Strait, a persistent density difference exists between the Pacific and the SCS (Figure 2-18). 00 kg/m3 at 3,500 m. 02 kg/m3 below 2,000 m (Figure 2-18) (Qu et al. 2006). Figure 2-18. Profile of potential density (kg/m3) is shown along 20°N, across the Bashi Strait. 5º grid and does not represent the actual water depth range (Qu et al.

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