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

Published online by Cambridge University Press:  27 April 2015

YINGDE WANG ,
FENGYUE SUN ,
LIANG LI ,
RUIHUA LI ,
JIAN WANG  and
WEI XIN
YINGDE WANG
Affiliation:
College of Earth Sciences, Jilin University, 2199 Jianshe Street, Changchun 130061, PR China
FENGYUE SUN*
Affiliation:
College of Earth Sciences, Jilin University, 2199 Jianshe Street, Changchun 130061, PR China
LIANG LI
Affiliation:
College of Earth Sciences, Jilin University, 2199 Jianshe Street, Changchun 130061, PR China
RUIHUA LI
Affiliation:
College of Earth Sciences, Jilin University, 2199 Jianshe Street, Changchun 130061, PR China
JIAN WANG
Affiliation:
College of Earth Sciences, Jilin University, 2199 Jianshe Street, Changchun 130061, PR China
WEI XIN
Affiliation:
College of Earth Sciences, Jilin University, 2199 Jianshe Street, Changchun 130061, PR China
*
*Author for correspondence: [email protected]
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Abstract

The 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.

Keywords

Adakitic rocksbimodal intrusive rockswestern Inner MongoliaPaleo-Asian Ocean
Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 6 , November 2015 , pp. 1057 - 1072
Copyright
Copyright © Cambridge University Press 2015 

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