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Global Geology 2015, 18(2) 88-97 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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Origin and chronology for hornblende gabbroic intrusions in Urad Zhongqi of western Inner Mongolia and their tectonic implications |
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WANG Yingde, SUN Fengyue, WANG Li, ZHANG Gengxin, LIU Jinlong and Huo Liang |
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1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� Geological Brigade No�� 208 of China National Nuclear Corporation��Baotou 014010��Inner Mongolia��China |
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Abstract��
The Urad Zhongqi mafic intrusions crop out in western Inner Mongolia and are dominated by horn- blende gabbro�� Zircon LA- ICP- MS U- Pb dating indicates that the mafic pluton was emplaced in the Early Per- mian (272 ±3Ma)�� The hornblende gabbro rocks have low concentrations of SiO 2 �� high total Fe 2 O 3 �� MgO�� Ni�� Co��Sc and Cr�� The rocks are characterized by selective enrichment of large ion lithophile elements (LILE) and light rare earth elements (L��EE)��and depletion in high field strength elements (HFSE) (e�� g�� Nb��Ta��Zr�� Hf��P and Ti)�� It suggests that they formed from a primary magma generated by the partial melting of lithos- pheric mantle material had been previously modified by subduction- related fluids�� According to the geochemical data and the geology of the region��the authors found that the Early Permian hornblende gabbroic in western In- ner Mongolia formed in a post- collisional extensional setting�� |
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Keywords��
Hornblende gabbro
western Inner Mongolia
Paleo- Asian Ocean
post-collisional extensional setting
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