| 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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| 引用本文：王楠,吴才来,马昌前.2017.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[J].地球学报,38(s1):33-37. |
| DOI：10.3975/cagsb.2017.s1.10 |
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| 基金项目:中国地质调查局项目(编号: 121201102000150005-06; 12120115027001) |
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| 中文摘要:造山带花岗岩浆作用一直是地学的重要研究方向, 它记录了地球动力学深部过程的信息, 开展深入的研究工作可以更好的了解板块汇聚环境的陆壳生长和再造以及壳幔之间的相互作用。北祁连造山带是一典型的早古生代造山带, 先后经历了洋盆的打开到闭合, 敦煌地块则是主要由前寒武纪TTG片麻岩和变质表壳岩组成。北祁连造山带和敦煌地块分别位于阿尔金断裂带东段的东南侧和西北侧, 且均出露有大面积的古生代花岗岩体。本文以阿尔金主断裂两侧产出的花岗岩类为研究对象, 涉及北祁连造山带中的赵家庄二长花岗岩, 石包城复式岩体(花岗岩、正长花岗岩和花岗闪长岩)和红柳河花岗岩, 敦煌地块中的党河水库花岗闪长岩、沙枣园二长花岗岩、安盆沟复式岩体(正长花岗岩和花岗岩)以及小草湖似斑状花岗岩。通过对上述花岗岩体的岩相学、锆石U-Pb年代学、地球化学和锆石Hf同位素的研究, 取得了新的认识: |
| 中文关键词:阿尔金断裂带 北祁连造山带 敦煌地块 花岗岩类 岩石成因 时空分布 动力学意义 |
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| The Paleozoic Granitic Magmatism of the Eastern Altyn Tagh Fault Belt and Its Continental Dynamic Significance |
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| Abstract: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: |
| keywords:Altyn tagh fault belt North Qilian orogenic belt Dunhuang block granitoids genesis temporal-spatial distribution dynamic significance |
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