scholarly journals A ∼2.5 Ga magmatic event at the northern margin of the Yangtze craton: Evidence from U-Pb dating and Hf isotope analysis of zircons from the Douling Complex in the South Qinling orogen

2013 ◽  
Vol 58 (28-29) ◽  
pp. 3564-3579 ◽  
Author(s):  
Juan Hu ◽  
XiaoChun Liu ◽  
LongYao Chen ◽  
Wei Qu ◽  
HuaiKun Li ◽  
...  
Keyword(s):  
Isotope Analysis ◽  
Hf Isotope ◽  
Qinling Orogen ◽  
The South ◽  
Yangtze Craton ◽  
Northern Margin ◽  
South Qinling ◽  
Magmatic Event

Petrogenesis and tectonic significance of the middle Neoproterozoic highly fractionated A-type granite in the South Qinling block

2021 ◽  
pp. 1-20
Author(s):  
Xiao-Fei Qiu ◽  
Qiong Xu ◽  
Tuo Jiang ◽  
Shan-Song Lu ◽  
Long Zhao
Keyword(s):  
Tectonic Setting ◽  
Eastern China ◽  
Continental Rift ◽  
The South ◽  
Yangtze Craton ◽  
Dabie Orogen ◽  
Northern Margin ◽  
South Qinling ◽  
Type Granite ◽  
High Alkali

Abstract The South Qinling block, a segment of the Yangtze craton involved in the Qinling–Dabie orogen, is critical for understanding the tectonic evolution of eastern China. However, the tectonic setting of the South Qinling block and the northern margin of the Yangtze block during middle Neoproterozoic time has long been the subject of debate, with two distinctly different models (continental rift or volcanic arc) proposed. Here, a comprehensive study of zircon U–Pb geochronology and geochemistry has been carried out on the Chengwan granitic pluton from the Suizao terrane in the South Qinling block. The granites are monzogranite and syenogranite in lithology, and are mainly composed of potash feldspar, quartz, plagioclase and biotite. This suite has long been regarded as a Palaeozoic magmatic pluton, but zircon U–Pb ages of 809 ± 9 Ma and 816 ± 4 Ma are obtained in this study. The granites are metaluminous to strongly peraluminous with high alkali contents, and exhibit highly fractionated features, including high SiO2, low Zr/Hf ratios, rare earth element tetrad effects and enrichment of K and Rb. They show Hf–Nd isotopic decoupling, which may be genetically related to their petrogenetic process. Based on the geochemical features and the positive εHf(t) values of the zircons, it is indicated that the granites may have been derived from partial melting of juvenile tonalitic rocks by biotite breakdown under fluid-absent conditions. The Chengwan granite geochemically belongs to the A2-subtype granites, suggesting that it might have formed in a post-orogenic tectonic setting. The highly fractionated A-type granite in this study may represent extensional collapse shortly after the collisional events in the South Qinling block, and thus indicate a tectonic regime switch, from compression to extension, as early as middle Neoproterozoic time. Integrating our new data with documented magmatic, metamorphic and sedimentary events during middle Neoproterozoic time in the region may support a continental rift model, and argues against arc models.

Kinematics of the Chengkou Fault in the South Qinling Orogen, Central China

2018 ◽  
Vol 114 ◽  
pp. 64-75 ◽  
Author(s):  
Jinxi Li ◽  
Zhiwu Li ◽  
Shugen Liu ◽  
Bo Ran ◽  
Yuehao Ye ◽  
...  
Keyword(s):  
Central China ◽  
Qinling Orogen ◽  
The South ◽  
South Qinling

Origin of carbonatites in the South Qinling orogen: Implications for crustal recycling and timing of collision between the South and North China Blocks

2014 ◽  
Vol 143 ◽  
pp. 189-206 ◽  
Author(s):  
Cheng Xu ◽  
Anton R. Chakhmouradian ◽  
Rex N. Taylor ◽  
Jindrich Kynicky ◽  
Wenbo Li ◽  
...  
Keyword(s):  
North China ◽  
Qinling Orogen ◽  
The South ◽  
Crustal Recycling ◽  
South Qinling
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