Major and trace element, and Sr-Nd isotope constraints on the origin of Paleogene volcanism in South China prior to the South China Sea opening

Chung, Sheng‐Luen; Cheng, Hai; Jahn, B.M.; O’Reilly, Suzanne Y.; Zhu, Bingquan

doi:10.1016/s0024-4937(97)00028-5

Cited by 102 publications

(98 citation statements)

References 52 publications

(71 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Volcanism of this period is mainly confined to the northern margin of the SCS and to South China coastal areas (Figure 1), forming bimodal volcanic rocks in the Sanshui, Lianping, and Heyuan basins (Figure 4) [9]. K-Ar dates on these volcanic rocks range from 64 to 43 Ma [48].…”

Section: Previous Studies On Volcanic Rocks In the South China Sea Anmentioning

confidence: 99%

“…Rock types include basalt, andesite, dacite, trachyte, rhyolite, and tuff ( Figure 5(a)). This bimodal magmatism may have resulted from double-layered convection in a magma chamber under an extensional environment associated with lithosphere thinning [9,63,64]. Normalization values are after [65].…”

Section: Previous Studies On Volcanic Rocks In the South China Sea Anmentioning

confidence: 99%

“…Normalization values are after [65]. [9]. In addition, dispersed Oligocene volcanic rocks (K-Ar ages 45-17 Ma; China Nanhai East Oil Company information) occur in the Pearl River Mouth basin and eastern Guangdong province.…”

Section: Previous Studies On Volcanic Rocks In the South China Sea Anmentioning

confidence: 99%

“…Named the Hainan mantle plume, it may be responsible for the wide-spread Cenozoic alkali basalts in the Leizhou Peninsula, Hainan Island, SCS, and Indochina, affecting an area of over 4×10 6 km 2 (Figure 1) [8]. If the Hainan mantle plume does exist, the relevant questions include the following: Was the plume activity responsible for the opening of [9][10][11][12]). The distribution of syn-spreading magmas is inferred from seafloor magnetic anomalies [1,11].…”

mentioning

confidence: 99%

See 3 more Smart Citations

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

et al. 2011

View full text Add to dashboard Cite

The South China Sea (SCS) is characterized by abundant seamounts, which provide important information about the evolution of the SCS and related deep processes. Cenozoic volcanism in the SCS and its surroundings comprises three stages relative to the spreading of the SCS: pre-spreading (>32 Ma), syn-spreading (32-16 Ma), and post-spreading (<16 Ma). The pre-spreading magmatism predominantly occurs on the northern margin of the SCS and in South China coastal areas and shows a bi-modal affinity. The syn-spreading magmatic activity was very limited on the periphery of the SCS, but may be concentrated in the SCS. However, seafloor samples of this stage are not available yet because of overlying thick sedimentary deposits. Post-spreading magmatism is widespread in the central and southwest sub-basins of the SCS, Hainan Island, Leizhou Peninsula, Thailand, and Vietnam. These are mainly alkali basalts with subordinate tholeiites, and display OIB-type geochemical characteristics. The Dupal isotope anomaly and presence of high-magnesian olivine phenocrysts suggests their possible derivation from the Hainan mantle plume. The temporal and spatial distribution of Cenozoic volcanism in the SCS and its surroundings may be accounted for either by plate stress re-organization before and after SCS spreading, or by ridge suction of plume flow during opening of the SCS. If the latter is the case, the volcanic rocks within the SCS basin may not be typical mid-ocean ridge basalts (MORB). It remains puzzling, however, that the transition between the South China continental margin and the SCS basin does not have features typical of a volcanic rifted margin. Clearly, the relationship between mantle plume and SCS opening needs further evaluation. A better understanding of the link between deep processes and opening of the SCS not only requires enhanced studies on igneous petrogenesis, but also is heavily dependent on systematic sampling of seafloor rocks.

show abstract

Section: Previous Studies On Volcanic Rocks In the South China Sea Anmentioning

confidence: 99%

Section: Previous Studies On Volcanic Rocks In the South China Sea Anmentioning

confidence: 99%

Section: Previous Studies On Volcanic Rocks In the South China Sea Anmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Basalts and andesites (~54 Ma, Chung et al, 1997), which form a sequence with a thickness of ca. 150 m, are intercalated with Early Paleogene sedimentary rocks in the center of the Lianping basin ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Chalcophile elemental constraints on sulfide-saturated fractionation of Cenozoic basalts and andesites in SE China

Yang

Zhao

et al. 2011

Lithos

View full text Add to dashboard Cite

Seismic stratigraphy of the central South China Sea basin and implications for neotectonics

et al. 2015

View full text Add to dashboard Cite

Coring/logging data and physical property measurements from International Ocean Discovery Program Expedition 349 are integrated with, and correlated to, reflection seismic data to map seismic sequence boundaries and facies of the central basin and neighboring regions of the South China Sea. First-order sequence boundaries are interpreted, which are Oligocene/Miocene, middle Miocene/late Miocene, Miocene/Pliocene, and Pliocene/Pleistocene boundaries. A characteristic early Pleistocene strong reflector is also identified, which marks the top of extensive carbonate-rich deposition in the southern East and Southwest Subbasins. The fossil spreading ridge and the boundary between the East and Southwest Subbasins acted as major sedimentary barriers, across which seismic facies changes sharply and cannot be easily correlated. The sharp seismic facies change along the Miocene-Pliocene boundary indicates that a dramatic regional tectonostratigraphic event occurred at about 5 Ma, coeval with the onsets of uplift of Taiwan and accelerated subsidence and transgression in the northern margin. The depocenter or the area of the highest sedimentation rate switched from the northern East Subbasin during the Miocene to the Southwest Subbasin and the area close to the fossil ridge in the southern East Subbasin in the Pleistocene. The most active faulting and vertical uplifting now occur in the southern East Subbasin, caused most likely by the active and fastest subduction/obduction in the southern segment of the Manila Trench and the collision between the northeast Palawan and the Luzon arc. Timing of magmatic intrusions and seamounts constrained by seismic stratigraphy in the central basin varies and does not show temporal pulsing in their activities.LI ET AL.

show abstract

Major and trace element, and Sr-Nd isotope constraints on the origin of Paleogene volcanism in South China prior to the South China Sea opening

Cited by 102 publications

References 52 publications

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

Chalcophile elemental constraints on sulfide-saturated fractionation of Cenozoic basalts and andesites in SE China

Seismic stratigraphy of the central South China Sea basin and implications for neotectonics

Contact Info

Product

Resources

About