Tectonic significance of the Late Carboniferous Zhunmubutai ophiolitic mélange from Xi-Ujimqin, Inner Mongolia

2018 ◽  
Vol 54 (1) ◽  
pp. 364-377 ◽  
Author(s):  
Guosheng Wang ◽  
Zhiguang Zhou ◽  
Liu Changfeng ◽  
Chen Wu ◽  
Hongying Li ◽  
...  
Keyword(s):  
Inner Mongolia ◽  
Late Carboniferous ◽  
Ophiolitic Mélange ◽  
Tectonic Significance

scholarly journals Late Carboniferous to early Permian sedimentary–tectonic evolution of the north of Alxa, Inner Mongolia, China: Evidence from the Amushan Formation

2016 ◽  
Vol 7 (5) ◽  
pp. 733-741 ◽  
Author(s):  
Haiquan Yin ◽  
Hongrui Zhou ◽  
Weijie Zhang ◽  
Xiaoming Zheng ◽  
Shengyu Wang
Keyword(s):  
Tectonic Evolution ◽  
Inner Mongolia ◽  
Late Carboniferous ◽  
Early Permian ◽  
The North

Geochronology, geochemistry, and geological implications of late Carboniferous – early Permian mafic and felsic intrusive rocks from Urad Zhongqi, western Inner Mongolia

2015 ◽  
Vol 152 (6) ◽  
pp. 1057-1072 ◽  
Author(s):  
YINGDE WANG ◽  
FENGYUE SUN ◽  
LIANG LI ◽  
RUIHUA LI ◽  
JIAN WANG ◽  
...  
Keyword(s):  
Partial Melting ◽  
Inner Mongolia ◽  
Tectonic Setting ◽  
Field Investigation ◽  
Late Carboniferous ◽  
Transitional Period ◽  
Crustal Material ◽  
Early Permian ◽  
Porphyritic Granite ◽  
Intrusive Rocks

AbstractThe mafic and felsic Haertaolegai intrusions crop out in Urad Zhongqi, western Inner Mongolia and are dominated by monzogranite, porphyritic granite, and gabbroic diorite intrusions. We investigate the tectonic setting, geochronology, and anorogenic characteristics of the western Inner Mongolia through field investigation, microscopic and geochemical analyses of samples from the Haertaolegai bimodal intrusions and laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) zircon U–Pb dating of gabbroic diorite and adakitic granites. Petrographic and geochemical studies of the bimodal intrusions indicate that the gabbroic diorites formed from a primary magma generated by the partial melting of lithospheric mantle material that had previously been modified by subduction-related fluids. The felsic rocks are high-K calc-alkaline and metaluminous, have characteristics of adakitic rocks and were generated during the partial melting of juvenile crustal material. Zircon U–Pb dating indicates that the felsic portion of this pluton was emplaced during late Carboniferous – early Permian time, with the mafic portion of the pluton emplaced during early Permian time. The zircons of adamellites have ɛHf(t) values and TDM2 ages of +1.0 to +2.7 and 1032–1128 Ma, respectively, suggesting that they formed from magmas generated by partial melting of juvenile Mesoproterozoic lower crust. These data, combined with the geology of the region, indicate that the late Carboniferous – early Permian bimodal intrusive rocks in western Inner Mongolia record a transitional period from collisional compression to post-collisional extension. These results indicate that the Paleo-Asian Ocean in western Inner Mongolia closed before 300 Ma.

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