Early Jurassic mafic magmatism in the Lesser Xing'an–Zhangguangcai Range, NE China, and its tectonic implications: Constraints from zircon U–Pb chronology and geochemistry

Lithos ◽  
2012 ◽  
Vol 142-143 ◽  
pp. 256-266 ◽  
Author(s):  
Jie-Jiang Yu ◽  
Feng Wang ◽  
Wen-Liang Xu ◽  
Fu-Hong Gao ◽  
Fu-Ping Pei
2017 ◽  
Vol 134 ◽  
pp. 262-280 ◽  
Author(s):  
Zhi-Hui Wang ◽  
Wen-Chun Ge ◽  
Hao Yang ◽  
Jun-Hui Bi ◽  
Zheng Ji ◽  
...  

Lithos ◽  
2021 ◽  
pp. 106489
Author(s):  
Qingqing Zhao ◽  
Degao Zhai ◽  
Jianping Wang ◽  
Jiajun Liu ◽  
Anthony E. Williams-Jones

2018 ◽  
Vol 158 (1) ◽  
pp. 143-157 ◽  
Author(s):  
Guangying Feng ◽  
Yildirim Dilek ◽  
Xiaolu Niu ◽  
Fei Liu ◽  
Jingsui Yang

AbstractThe Zhangguangcai Range in the Xing’an Mongolian Orogenic Belt, NE China, contains Early Jurassic (c. 188 Ma) Dabaizigou (DBZG) porphyritic dolerite. Compared with other island-arc mafic rocks, the DBZG dolerite is characterized by high trace-element contents, relatively weak Nb and Ta enrichments, and no Zr, Hf or Ti depletions, similar to OIB-type rocks. Analysed rocks have (87Sr/86Sr)i ratios of 0.7033–0.7044, relatively uniform positive ɛNd(t) values of 2.3–3.2 and positive ɛHf(t) values of 8.5–17.1. Trace-element and isotopic modelling indicates that the DBZG mafic rocks were generated by partial melting of asthenospheric mantle under garnet- to spinel-facies conditions. The occurrence of OIB-like mafic intrusion suggests significant upwelling of the asthenosphere in response to lithospheric attenuation caused by continental rifting. These processes occurred in an incipient continental back-arc environment in the upper plate of a palaeo-Pacific slab subducting W–NW beneath East Asia.


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