Geochemical and isotopic evidence for a magmatic-hydrothermal origin of the polymetallic vein-type Zn-Pb deposits in the northwest margin of Jiangnan Orogen, South China

2017 ◽  
Vol 86 ◽  
pp. 673-691 ◽  
Author(s):  
Zhengbing Zhou ◽  
Hanjie Wen ◽  
Chaojian Qin ◽  
Ling Liu
Keyword(s):  
South China ◽  
Isotopic Evidence ◽  
Hydrothermal Origin ◽  
Vein Type

scholarly journals Mineralogy and Garnet Sm–Nd Dating for the Hongshan Skarn Deposit in the Zhongdian Area, SW China

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 243 ◽  
Author(s):  
Zu ◽  
Xue ◽  
Dong ◽  
Zhao
Keyword(s):  
Late Cretaceous ◽  
Southwest China ◽  
Skarn Deposit ◽  
Genetic Event ◽  
Sw China ◽  
Multiple Events ◽  
Hydrothermal Origin ◽  
Vein Type

The Hongshan deposit is one of the largest Cu-polymetallic deposits in the Zhongdian area, southwest China. Two types of Cu–Mo ores, mainly developed in the skarns, have been recognized in the Hongshan deposit, i.e., massive or layered skarn and vein-type, with the former being dominant. The highly andraditic composition of garnet (Adr100 to Adr64Gr32) and diopsidic composition of pyroxene (Di90Hd9 to Di1Hd99) indicate the layered skarn ores are of magmatic-hydrothermal origin that formed under oxidized conditions. Sm–Nd dating of garnet yield a well-constrained isochron age of 76.48 ± 7.29 Ma (MSWD = 1.2) for the layered skarn ores. This age was consistent with the Re–Os age for the pyrrhotite from the layered skarn ores, and thereby indicated that the layered skarn mineralization was formed in the Late Cretaceous, rather than in the Triassic as was previously thought. The coincidence of the geochronology from the layered skarn ores and vein-type mineralization further indicated that both ores were the result of a single genetic event, rather than multiple events. The recognition of the Late Cretaceous post-collisional porphyry–skarn Cu–Mo–W belt in the Zhongdian area exhibited a promising prospecting potential.

Molybdenite Re–Os and muscovite 40Ar/39Ar dating of quartz vein-type W–Sn polymetallic deposits in Northern Guangdong, South China

2012 ◽  
Vol 47 (6) ◽  
pp. 607-622 ◽  
Author(s):  
Hua-Wen Qi ◽  
Rui-Zhong Hu ◽  
Xiao-Fei Wang ◽  
Wen-Jun Qu ◽  
Xian-Wu Bi ◽  
...  
Keyword(s):  
South China ◽  
Quartz Vein ◽  
Vein Type ◽  
Northern Guangdong

Foraminiferal isotopic evidence for monsoonal activity in the South China Sea: a present-LGM comparison

2005 ◽  
Vol 54 (1-2) ◽  
pp. 125-139 ◽  
Author(s):  
Xinrong Cheng ◽  
Baoqi Huang ◽  
Zhimin Jian ◽  
Quanhong Zhao ◽  
Jun Tian ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
Isotopic Evidence ◽  
China Sea

scholarly journals Chemostratigraphic correlations across the first major trilobite extinction and faunal turnovers between Laurentia and South China

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jih-Pai Lin ◽  
Frederick A. Sundberg ◽  
Ganqing Jiang ◽  
Isabel P. Montañez ◽  
Thomas Wotte
Keyword(s):  
North America ◽  
Sequence Stratigraphy ◽  
South China ◽  
Middle Cambrian ◽  
Isotopic Evidence ◽  
Carbonate Carbon ◽  
Stage 4 ◽  
Extinction Event ◽  
Critical Boundary ◽  
Cambrian System

AbstractDuring Cambrian Stage 4 (~514 Ma) the oceans were widely populated with endemic trilobites and three major faunas can be distinguished: olenellids, redlichiids, and paradoxidids. The lower–middle Cambrian boundary in Laurentia was based on the first major trilobite extinction event that is known as the Olenellid Biomere boundary. However, international correlation across this boundary (the Cambrian Series 2–Series 3 boundary) has been a challenge since the formal proposal of a four-series subdivision of the Cambrian System in 2005. Recently, the base of the international Cambrian Series 3 and of Stage 5 has been named as the base of the Miaolingian Series and Wuliuan Stage. This study provides detailed chemostratigraphy coupled with biostratigraphy and sequence stratigraphy across this critical boundary interval based on eight sections in North America and South China. Our results show robust isotopic evidence associated with major faunal turnovers across the Cambrian Series 2–Series 3 boundary in both Laurentia and South China. While the olenellid extinction event in Laurentia and the gradual extinction of redlichiids in South China are linked by an abrupt negative carbonate carbon excursion, the first appearance datum of Oryctocephalus indicus is currently the best horizon to achieve correlation between the two regions.

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