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| Keywords | |
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central Great Xingan ��ange |
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Arshan area |
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zircon U-Pb age |
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A2-type granite |
| Authors | |
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TIAN De-Xin-1 |
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WANG Qing-Hai-2 |
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GE Wen-Chun-1 |
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ZHANG Yan-Long-1 |
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CHEN Hui-Jun-3 |
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YANG Hao-1 |
| PubMed | |
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Article by Tian, D. X. 1 |
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Article by Wang, Q. H. 2 |
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Article by Ge, W. C. 1 |
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Article by Zhang, Y. L. 1 |
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Article by Chen, H. J. 3 |
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Article by Yang, H. 1 |
Zircon U-Pb ages and geochemical characteristics of Lvshui alkali feldspar granites in Arshan��Inner Mongolia and their tectonic implications
TIAN De-Xin-1, WANG Qing-Hai-2, GE Wen-Chun-1, ZHANG Yan-Long-1, CHEN Hui-Jun-3, YANG Hao-1
1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. International Center for Geoscience ��esearch and Education in Northeast Asia��Jilin University��Changchun 130026��China; 3. Shenyang Institute of Geology and Mineral ��esource��Shenyang 110034��China
Zircon U-Pb dating by LA-ICP-MS technique indicated that the Lvshui alkali feldspar granite formed in Early Cretaceous ( 139. 4 ± 1. 6 Ma) �� The geochemistrical characteristics showed that these granites belonged to peraluminous high-k calc-alkaline A2-type granite�� The alkali feldspar granites were high in silicon and alkalis��and low in CaO��Fe2O3 ��MgO and P2O5 �� The rocks were obiviously riched in L��EE��HFSEs ( Zr and Hf) and LILEs ( ��b��U��Th��and K) ��and deplted in H��EE��Ba��Nb��Ta��Sr��and P with significantly negative Eu anomaly�� Combined with the regional geological data��the authors propose that the formation of Early Cretaceous alkali feldspar granitic rocks were related to a post-orogenic extensional environment induced by the delamination of lithosphere arose from subduction of the Paleo-Pacific plate��