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2013, 32(2) 209-243 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Zircon U--Pb age and geochemical characteristics of the granites in Chenming area��southeastern Xiao Hinggan mountains |
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WEI Lian-Xi-1, 2, SUN Feng-Yue-1, XUE Ming-Xuan-3, YU Xiao-Fei-1, SUN Nai-Quan-4 |
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1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� Research Institute of Geological Exploration for Nonferrous Metals in Heilongjiang Province��Harbin 150046��China; 3�� 707 Team of Geological Exploration for Nonferrous Metals Heilongjiang Province��Heilongjiang Province��Suihua 152000�� Heilongjiang��China; 4�� College of Geology Engineering and Geomatics��Chang’an University��Xi’an 710054��China |
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Abstract��
Chenming pluton is located in the southeastern Xiao Hinggan mountains��composed of monzonitic granite and granodiorite�� Combined with the Th /U ratios of zircons in all samples which possess oscillatory growth ring��it suggests that these zircons are magmatic in origin�� LA--ICP MS U--Pb dating results show that the forming age is 432. 8 ± 1. 2 and 431. 9 ± 1. 7 Ma��which indicates the Early Silurian�� According to its geochemical characteristics�� the Chenming pluton belongs to high potassium calc--alkaline series in category�� Its ACNK value is ranging between 1. 16 �� 1. 40��which indicates to be peraluminous granite in nature�� The trace elements are enriched by LILE ( Rb��Ba��U and Th) and LREE��with loss of HFSE ( Nb��Ta��Ti) ��P��Sr and HREE��which impliesthat the Chenming pluton originated mainly from the partial melting of lower crust material��and its peraluminous characteristics suggested its forming in the environment of continental crust thickening�� Combined with the results of previous researches��the Chenming pluton formed in the collision backgroud of Songnen massif with Jiamusi massif�� that means the collision of Songnen massif and Jiamusi massif may occur in the Early Silurian�� |
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Keywords��
Chenming area
granite
zircon U-Pb age
LA-ICP-MS
Xiao Hinggan mountains
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