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2016, 35(2) 283-296 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Petrogenesis of Early Cretaceous granites in Taerqi area of central Great Xing’an ��ange and its tectonic setting |
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JI Zheng, GE Wen-Chun, YANG Hao, TIAN De-Xin, ZHANG Yan-Long, CHEN Hui-Jun |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Shengyang Institute of Geology and Mineral ��esources��Shengyang 110034��China |
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Abstract��
Through whole- rock geochemistry��geochronology��and zircon Lu- Hf isotope compositions in Sand- aoqiao and Sangduoer plutons from the Taerqi area of the central Great Xing’an ��ange�� NE China�� their formation age��petrogenesis and magma sources are investigated�� Sandaoqiao and Sangduoer plutons are composed mainly of syenogranites and monzogranites��respectively�� The LA-ICP-MS zircon U-Pb dating shows that Sandaoqiao and Sangduoer plutons formed during the Early Cretaceous with ages of 143 Ma and 141 Ma��respectively�� Geochemically��they belong to highly fractionated I- type granitoid��and have the similar magma source�� All of the magmatic zircons from these granites have positive ε Hf (t) values (4. 9 �� 9. 3 and 2. 1 �� 8. 1��respectively) and young Hf two- stage model ages (598 ��882 Ma and 676 ��1 062 Ma��respectively)��suggesting that their primary magma was derived from partial melting of Neoproterozoic to Phanerozoic newly accreted juvenile crustal material�� Combined with regional geological investigations��it is indicated that the formation of Sandaoqiao and Sangduoer plutons was closely related to lithospheric extension caused by closure of the Mongol-Okhotsk Ocean�� |
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Keywords��
Taerqi area
Early Cretaceous
granite
zircon U-Pb age
Hf isotope
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Received Revised Online: |
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