| 阿尔金断裂带东段古生代花岗岩浆作用及其大陆动力学意义 |
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| 关键词:Altyn tagh fault belt North Qilian orogenic belt Dunhuang block granitoids genesis temporal-spatial distribution dynamic significance |
| 基金项目:中国地质调查局项目(编号: 121201102000150005-06; 12120115027001) |
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| The Paleozoic Granitic Magmatism of the Eastern Altyn Tagh Fault Belt and Its Continental Dynamic Significance |
| As an important research direction in earth sci-ence, granitic magmatism of the orogenic belt con-tains abundant information about the geodynamic process at depths. Research work about granitoids can provide more information for understanding the growth and reconstruction of continental crust in plate convergence environment and the crust-mantle inter-action. The North Qilian orogenic belt was a typical Early Paleozoic orogenic belt through opening and closing of an ocean basin, while Dunhuang block was mainly composed of Precambrain TTG gneisses and metamorphosed supracrustal rocks. The two tectonic units were located on the northeast side and southwest side of the eastern Altyn tagh fault belt, respectively, with numerous Paleozoic granitoids emplaced in. Aiming to better understand the tectonic evulotion and the geodynamic significance of North Qilian orogenic belt and Dunhuang block, in this thesis, granitoids exposed along the Altyn tagh fault were selected as the research subjects, involving Zhaojiazhuang mon-zogranite, Shibaocheng composite granites (granite, syenogranite and granodiorite) and Hongliuhe granite in North Qilian orogenic belt and Danghe reservoir granodiorite, Shazaoyuan monzogranite, Anpengou composite granites(syenogranite and granite) and Xiaocaohu porphyritic granite in Dunhuang block. On the basis of petrography, zircon U-Pb geochronology, geochemistry and zircon Hf isotope for the granitoids mentioned above, new understandings have been achieved: |
| WANG Nan,WU Cai-lai,MA Chang-qian.2017.The Paleozoic Granitic Magmatism of the Eastern Altyn Tagh Fault Belt and Its Continental Dynamic Significance[J].Acta Geoscientica Sinica,38(s1):33-37. |
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