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2013, 32(4) 665-680 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Zircon U-Pb ages��geochemistry features and its geological implication of Early Cretaceous granites in Xinsheng area of Heihe City |
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ZHU Huai-Liang-1, CHEN Yue-Jun-2, WU Guo-Xue-1, LI Yun-Feng-2, ZHANG Yu-Feng-3, WU Tao-Tao-4 |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. ��esearch Center of Palaeontology �� Stratigraphy��Jilin University��Changchun 130026��China; 3. Institute of Geological Survey of Inner Mongolia Autonomous ��egion��Huhhot 010020��China; 4. Shenyang Institute of Geology and Mineral ��esources��Shenyang 110034��China; 5. Museum of Geology��Jilin University��Changchun 130026��China |
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Abstract��
Xinsheng area of Heihe is located in the boundary area of Great Xing'an ��ange and Lesser Xing'an ��ange Mts��where the Early Cretaceous magmatic activity was frequently�� The rocks are mainly composed of granite porphyry and granodiorite��with geochemical characteristics of high-K calc-alkaline I-type granite series��which enrichment in large-ion lithophile elements ( LILE) and depletion in high field strength elements ( HFSE) �� The UPb dating results confirmed by LA-ICPMS indicated that granite porphyry and granodiorite were emplaced at 118. 1 ± 1. 5 Ma and 112. 8 ± 0. 9 Ma��respectively��which were consistented with the stages of volcanic rocks�� Characteristics of zircon Hf isotopic indicated that the source rocks of Early Cretaceous granites were igneous rocks originated from depleted mantle of Mid-Neo Proterozoic�� Combining with their petrography and geological data of adjacent regions�� the authors proposed that Early Cretaceous granites might be closely related to the subduction of paleo-Pacific tectonic plate�� |
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Keywords��
Early Cretaceous granites
zircon U-Pb ages
geochemistry
geological implication
Xinsheng area of Heihe
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