U-Pb isotope geochronology and geochemistry of granites from Hainan Island (northern South China Sea margin): Constraints on late Paleozoic-Mesozoic tectonic evolution

2017 ◽  
Vol 49 ◽  
pp. 333-349 ◽  
Author(s):  
Quanshu Yan ◽  
Ian Metcalfe ◽  
Xuefa Shi
Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3540
Author(s):  
Qian Ge ◽  
Z. George Xue ◽  
Fengyou Chu

A total of 388 surface sediment samples taken from the northern South China Sea (SCS) continental shelf were analyzed to characterize the signature of their rare earth elements (REEs). The average REEs concentration was 192.94 μg/g, with a maximum of 349.07 μg/g, and a minimum of 32.97 μg/g. The chondrite-normalized REEs pattern exhibits a remarkably light REEs accumulation, a relatively flat heavy REEs pattern, and a negative Eu anomaly. We subdivided the study area into three zones using the characteristics of REEs and statistical characteristics. Zone I: continental shelf off western Guangdong Province. Here, the sediment provenance is mainly river-derived from the Pearl River, Taiwanese rivers, and those in the adjacent area. Zone II: Qiongzhou Strait and Leizhou Peninsula. Here, the sediment provenance consists of the Qiongzhou Strait and the Hainan Island. Zone III: Hainan Island and SCS slope sediments are dominated. The REEs compositions are mainly controlled by source rock properties, hydrodynamic conditions, and an intensity of chemical weathering. We reconstructed the sediment dispersal and transport route using the REEs compositions, grain size, and other geochemical characteristics throughout the study area.


Crustaceana ◽  
2017 ◽  
Vol 90 (1) ◽  
pp. 35-48 ◽  
Author(s):  
Jian-Qiang Yin ◽  
Kai-Zhi Li ◽  
Ye-Hui Tan

Specimens previously identified asBathyconchoecia paululasensu Yin & Chen, 1991 andBathyconchoecia galeritasensu Yin & Chen, 1991, together with two similar specimens, are reclassified as a new species,Bathyconchoecia incisasp. nov., which we describe and illustrate in detail here. The present species is similar toBathyconchoecia sagittariusandBathyconchoecia kornickeriin having a shallow notch on the posterodorsal corner of the carapace, but can be easily distinguished from these species by the structure of the posterior margin of the carapace and the striated sculpturing on the surface of the valves. The specimens on which this new classification was based were collected at shallow depths (<125 m) off the east coast of Hainan Island, in the northern South China Sea and in the Zengmu (James) Shoal and adjacent areas in the southern South China Sea.B. incisais likely to be a shallow-water species or has a wide bathymetric range.


Palaeoworld ◽  
2020 ◽  
Vol 29 (3) ◽  
pp. 636-647 ◽  
Author(s):  
Ismail Adejare Ladigbolu ◽  
Bao-Hua Li ◽  
Hong-Liang Li ◽  
Martin G. Wiesner ◽  
Zhou-Fei Yu ◽  
...  

2009 ◽  
Vol 20 (1) ◽  
pp. 147-159 ◽  
Author(s):  
Dongdong Dong ◽  
Gongcheng Zhang ◽  
Kai Zhong ◽  
Shengqiang Yuan ◽  
Shiguo Wu

1999 ◽  
Vol 17 (3) ◽  
pp. 233-239 ◽  
Author(s):  
Yan Tao ◽  
Yan Wen-xia ◽  
Dong Yu ◽  
Wang Hua-jie ◽  
Yan Yan ◽  
...  

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