| 中祁连东段晋宁期碰撞型花岗岩及其地质意义 |
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| 引用本文： | 郭进京,赵凤清,李怀坤.中祁连东段晋宁期碰撞型花岗岩及其地质意义[J].地球学报,1999,20(1):10-15. |
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| 作者姓名： | 郭进京 赵凤清 李怀坤 |
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| 作者单位： | 1. 西北大学地质系,西安
2. 中国地质科学院天津地质矿产研究所 |
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| 摘 要： | 对中祁连地块东段西宁西部近S-N向展布的元古宙花岗岩带地质地球化学和年代学研究表明:它侵位于元古宙基底中浅变质岩系湟源群中,具有同碰撞S型花岗岩的性质;(917±12)Ma的单颗粒锆石U-Pb年龄记录了其侵位的时代为新元古宙晋宁期,这一新元古宙晋宁期碰撞型花岗岩带具有重要的地质意义.
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| 关 键 词： | 中祁连地块东段 新元古宙 碰撞型花岗岩 晋宁期碰撞带 S-N向构造 |
Jinningian Collisional Granite Belt in the Eastern Sector of the Central Qilian Massif and Its Implication |
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| GUO Jin-jing,ZHAO Feng-qing and LI Huai-kun.Jinningian Collisional Granite Belt in the Eastern Sector of the Central Qilian Massif and Its Implication[J].Acta Geoscientia Sinica,1999,20(1):10-15. |
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| Authors: | GUO Jin-jing ZHAO Feng-qing and LI Huai-kun |
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| Institution: | Department of Geology, Northwest University, Xi'an;Tianjin Institute of Geology and Mineral Reesourses, CAGS;Tianjin Institute of Geology and Mineral Reesourses, CAGS |
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| Abstract: | The Proterozoic granite belt emplaced into the Huangyuan Group a medium-and low-grade metamorphic series of the Proterozoic basement in the eastern central Qilian massif extends in a N S direction.Its geochemical features indicate that it is a syn-collisional S-type granite belt. (917±12) Ma of single-grain zircon U-Pb age constrains its emplacement age. From above it is suggested that the easten central Qilian massif had undergone Jinningian collisional orogenesis. Finally the authors discuss the geological implication of the Proterozoic syn-collisional granite belt in the easten central Qilian massif. |
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| Keywords: | eastern central Qilian massif Neoproterozoic syn-collisional granite Jinningian collisional zone N-S trending structure |
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