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2012, 31(3) 451-461 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Discovery of Ordovician pluton in Abaga Banner��Inner Mongolia and its geological significance |
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ZHAO Li-Gang-1, RAN Hao-2, ZHANG Qing-Hong-3, LI Cheng-Dong-1, WANG Hui-Chu-1, ZHANG Kuo-1, XU Ya-Wen-1, HOU Ke-Jun-4 |
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1. Tianjin Institute of Geology and Mineral Resources��Tianjin 300170��China; 2. Faculty of Geosciences and Resources��China University of Geosciences��Beijing 100083��China; 3. No. 11 of Geological Brigade of Hebei Geology and Mineral Exploration Bureau��Xingtai 054000��Hebei��China; 4. Institute of Mineral Resources��Chinese Academy of Geological Sciences��Beijing 100037��China |
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Abstract��
Geri Obo complex pluton in Abaga Banner is located in northern Hegenshan fault belt��and consists of quartz diorite��granodiorite and biotite monzogranite��in which the monzogranite is the major rocks�� By LA-MC- ICP-MS zircon U-Pb dating��the monzogranite206Pb /238U age was 449 ± 3. 0 Ma��showing the Late Ordovician�� Geri Obo pluton had high-K calc-alkaline characteristics��and enriched in LREE�� The trace elements were depleted in Ba��Sr��Nb��Ta��P��Ti��but enriched in Rb��Th��U��K��Nd and Zr��showing Geri Obo pluton formed in active continental margins��and might be related to the subduction event in southern Sonid zuoqi�� |
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Keywords��
Inner Mongolia
Abaga Banner
Geri Obo
northern Hegenshan fault belt
Ordovician intrusive rocks
Early Paleozoic active continental margin
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