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| U-Pb AGE OF ZIRCON FROM THE SYENOGRANITE IN ADELAGAWULA, INNER MONGOLIA |
| ZHANG Yu-qing1, ZHANG Jian2, QU qiang3, GAO Qing-Xiu1 |
1. Inner Mongolia Institute of Geological Survey, Hohhot 010020, China;
2. No. 8 Institute of Geology and Mineral Exploration and Development, Wuhai 016000, Inner Mongolia, China;
3. No. 5 Institute of Geology and Mineral Exploration and Development, Baotou 014000, Inner Mongolia, China |
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Abstract The Adelagawula syenogranite occurs in Abaga Qi, Inner Mongolia, near the Sino-Mongolian border. The intrusive rock was assigned to Early-Yanshanian (Kγ52) by 1:200 000 regional geological surveyor or Lower Permian as alkali feldspar granite(P1χγ) in 1:250 000 regional geological survey. The U-Pb isotopic dating of the syenogranite shows the age of 273.1±0.4 Ma. Combined with regional geological data and previous research, it is possibly a product of Early Permian magmatism. The syenogranite, with high silica, high potassium, per-aluminum and poor calcium-magnesium-iron, belongs to post-orogenic I-type granite. The REE distribution is in V-shaped pattern, with low total rare earth content, unobvious fractionation of LREE and HREE, δEu values ranging from 0.07 to 0.60 and strongly depleted Eu.
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Received: 21 January 2013
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2013, Vol. 22 
