Plio–Quaternary sedimentation processes and neotectonics of the northern continental margin of the South China Sea

Lüdmann, Thomas; Wong, Heung‐wah; Wang, Pinxian

doi:10.1016/s0025-3227(00)00129-8

Cited by 172 publications

(76 citation statements)

References 20 publications

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“…2) a normal E-W to ENE-WSW trending system developed between the Late Eocene and the Early Miocene (Yu, 1990(Yu, , 1994) and 3) a sinistral strike-slip NW-SE system which is associated with the Red River Fault (Lüdmann and Wong, 1999) and is currently active as shown by earthquake focal mechanisms (Wei and Chung, 1995). On the northern continental margin of the South China Sea, Lüdmann et al (2001) attempted to derive a neotectonic curve by subtracting eustatic sea-level changes from the relative sea-level curve. Although there is no agreed eustatic curve, Lüdmann et al's Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The ocean south of Hong Kong and around the Dongsha Archipelago (Fig. 1B) has been interpreted to have undergone two uplift episodes during the past 5 million years; at the Miocene/Pliocene boundary and the end of Lower Pleistocene, leading to subaerial exposure of the Dongsha rise (Lüdmann et al, 2001), see Fig. 14. After the major collision of Taiwan with the East China continental margin 5 Ma ago (Mio/Pliocene boundary), the NNW-WNW compression was turned into a WSW-SSW strike-slip motion along the continental margin of the northern South China Sea, generating a transtensional tectonic regime which activated and reactivated crustal zones of weakness, and caused upwelling of mantle material and magma intrusion into the upper crust and uplift of the caprocks (Lüdmann and Wong, 1999) (see the Hainan and Wenshan uplift on Fig.…”

Section: Introductionmentioning

confidence: 99%

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Coastal Quaternary morphologies on the northern coast of the South China Sea, China, and their implications for current tectonic models: A review and preliminary study

et al. 2008

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Marine terraces, tidal notches and sediments along a 1200-km-long stretch of the northern coast of the South China Sea passive margin were studied and divided into five areas with varying tectonic characters. Up to three marine terraces occur, that have elevations reaching up to 60 m above mean sea level (amsl), and two marine notches occur up to 11 m amsl. Chronology of the morphologies and deposits was obtained mainly by comparison with Quaternary sea levels derived from the oxygen isotope curve. However, prior to the last interglacial highstand (MIS 5e, c. 125 ka), evidence of history of events is less well-constrained, leading to less precision on sea-level positions prior to MIS 5e. Using the morphological features of MIS 5e as a marker, mean coastal uplift rates in the last c.125 ka range from 0.07 mm/yr to 0.18 mm/yr. The pattern of deformations is slightly higher than those observed on passive margin coasts in other parts of the world. The cause of uplift of the south China coastline is not clear, but may relate to the Himalayan collision zone or any other large-scale phenomena.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coastal Quaternary morphologies on the northern coast of the South China Sea, China, and their implications for current tectonic models: A review and preliminary study

et al. 2008

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“…F5). Comparison of these trends with the neotectonic curve calculated for the SCS northern margin (Lüdmann et al, 2001) indicates that since 600 ka, when the northern margin started uplifting, the frequency of GCLs was increased (Fig. F5).…”

Section: Discussionmentioning

confidence: 93%

Origin and Nature of Green Clay Layers, ODP Leg 184, South China Sea

Tamburini

Adatte

Föllmi

2003

Proceedings of the Ocean Drilling Program

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Green clay layers are reported from the Pliocene-Holocene intervals in five of the six sites drilled in the South China Sea (SCS) during Leg 184. Centimeter-scale discrete, discontinuous, and bioturbated layers, constituted by stiff and porous green clays, were observed, sometimes associated with iron sulfides and pyrite. Detailed mineralogical and geochemical analyses indicate that they differentiate from the host sediments in their higher content of iron, smectite, and mixed-layered clays and lower amounts of calcite, authigenic phosphorus, quartz, and organic matter. Although no glauconite was observed, the mineralogy and geochemistry of green clay layers, along with their geometrical relation to background sediments, suggest that they most likely represent the result of the first steps of glauconitization. Correlation between green layers and volcanic ash layers was suggested for green laminae observed elsewhere in Pacific sediments but was not confirmed at SCS sites. Statistical analysis of the temporal distribution of green layers in the records of the last million years suggests that green clay layers have become more frequent since 600 ka. Only at Site 1148 does the green layer record show a statistically significant cyclicity which may be related to orbital eccentricity. A possible influence of sea level variations, related both to climatic changes and tectonism, is postulated.

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“…Since the Middle Miocene, large amounts of terrigenous sediments were transported by the Pearl River to the northern continental margin of the SCS and formed sedimentary sequences, the main part of which consist of progradational deltas formed during the regressive periods (Pang et al 2005;Wu et al 2008). In the Pleistocene, the Pearl River delta prograded to the shelf edge and formed thick clinoforms, with the maximum thickness occurring at the modern shelf break (Lüdmann et al 2001;Pang et al 2005;Wu et al 2008).…”

Section: Regional Settingmentioning

confidence: 99%

Slope-confined submarine canyons in the Baiyun deep-water area, northern South China Sea: variation in their modern morphology

Zhou

et al. 2016

Mar Geophys Res

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On the basis of newly collected multibeam bathymetric data, chirp profiles and existing seismic data, we presented a detailed morphological interpretation of a series of slope-confined canyons in water depths of 300-2000 m in the Baiyun deep-water area, northern margin of the South China Sea. Although these canyons are commonly characterized by regular spacing and a straightline shape, they vary in their lengths, starting and ending water depths, canyon relief, slope gradients, wall slope gradients and depth profiles along the axis. The eastern canyons (C1-C8) have complex surface features, low values in their slope gradient, canyon relief and wall slope gradient and high values in their length and starting and ending depth contrasting to the western ones (C9-C17). From the bathymetric data and chirp profiles, we interpret two main processes that have controlled the morphology and evolution of the canyons: axial incision and landsliding. The western part of the shelf margin where there were at least four stages of submerged reefs differs from the eastern part of the shelf margin where sedimentary undulations occurred at a water depth of *650 m. We consider that the variation in morphology of submarine canyons in the study area is the result of multiple causes, with the leading cause being the difference in stability of the upper slope which is related to the submerged reefs and sedimentary undulations.

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Plio–Quaternary sedimentation processes and neotectonics of the northern continental margin of the South China Sea

Cited by 172 publications

References 20 publications

Coastal Quaternary morphologies on the northern coast of the South China Sea, China, and their implications for current tectonic models: A review and preliminary study

Coastal Quaternary morphologies on the northern coast of the South China Sea, China, and their implications for current tectonic models: A review and preliminary study

Origin and Nature of Green Clay Layers, ODP Leg 184, South China Sea

Slope-confined submarine canyons in the Baiyun deep-water area, northern South China Sea: variation in their modern morphology

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