scholarly journals Genesis of the South Zhuguang Uranium Ore Field, South China: Pb Isotopic Compositions and Mineralization Ages

2018 ◽  
Vol 69 (1) ◽  
pp. 22-42 ◽  
Author(s):  
Chuang Zhang ◽  
Yuqi Cai ◽  
Qian Dong ◽  
Hao Xu
Keyword(s):  
South China ◽  
The South ◽  
Uranium Ore ◽  
Isotopic Compositions

scholarly journals Calcium Isotopic Compositions of Neogene Dolomites in the South China Sea and Its Implications for Paleoclimate Changes

2021 ◽  
Author(s):  
Xiaofeng Liu ◽  
Xiaoming Liu ◽  
Shikui Zhai ◽  
Cheng Cao ◽  
Dongjie Bi ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Isotopic Compositions

scholarly journals Post-spreading Basalts from the Nanyue Seamount: Implications for the Involvement of Crustal- and Plume-Type Components in the Genesis of the South China Sea Mantle

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 378
Author(s):  
Hao Zheng ◽  
Li-Feng Zhong ◽  
Argyrios Kapsiotis ◽  
Guan-Qiang Cai ◽  
Zhi-Feng Wan ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Upper Mantle ◽  
The South China Sea ◽  
The South ◽  
Alkali Basalts ◽  
China Sea ◽  
Isotopic Compositions ◽  
Geological Processes ◽  
Depleted Mantle

Fresh samples of basalts were collected by dredging from the Nanyue intraplate seamount in the Southwest sub-basin of the South China Sea (SCS). These are alkali basalts displaying right-sloping, chondrite-normalized rare earth element (REE) profiles. The investigated basalts are characterized by low Os content (60.37–85.13 ppt) and radiogenic 187Os/188Os ratios (~0.19 to 0.21). Furthermore, 40Ar/39Ar dating of the Nanyue basalts showed they formed during the Tortonian (~8.3 Ma) and, thus, are products of (Late Cenozoic) post-spreading volcanism. The Sr–Nd–Pb–Hf isotopic compositions of the Nanyue basalts indicate that their parental melts were derived from an upper mantle reservoir possessing the so-called Dupal isotopic anomaly. Semiquantitative isotopic modeling demonstrates that the isotopic compositions of the Nanyue basalts can be reproduced by mixing three components: the average Pacific midocean ridge basalt (MORB), the lower continental crust (LCC), and the average Hainan ocean island basalt (OIB). Our preferred hypothesis for the genesis of the Nanyue basalts is that their parental magmas were produced from an originally depleted mantle (DM) source that was much affected by the activity of the Hainan plume. Initially, the Hainan diapir caused a thermal perturbation in the upper mantle under the present-day Southwest sub-basin of the SCS that led to erosion of the overlying LCC. Eventually, the resultant suboceanic lithospheric mantle (SOLM) interacted with OIB-type components derived from the nearby Hainan plume. Collectively, these processes contributed crustal- and plume-type components to the upper mantle underlying the Southwest sub-basin of the SCS. This implies that the Dupal isotopic signature in the upper mantle beneath the SCS was an artifact of in situ geological processes rather than a feature inherited from a Southern Hemispheric, upper mantle source.

Boron isotopic compositions in growing corals from the South China Sea

2013 ◽  
Vol 62 ◽  
pp. 561-567 ◽  
Author(s):  
Jun Xiao ◽  
Yingkai Xiao ◽  
Zhangdong Jin ◽  
Congqiang Liu ◽  
Maoyong He
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Isotopic Compositions
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