| 北秦岭元古代构造格架与演化 |
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| 引用本文： | 董云鹏,张国伟,赵霞,姚安平.北秦岭元古代构造格架与演化[J].大地构造与成矿学,2003,27(2):115-124. |
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| 作者姓名： | 董云鹏 张国伟 赵霞 姚安平 |
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| 作者单位： | 西北大学地质系造山带地质研究所,陕西,西安,710069 |
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| 基金项目： | 国家自然科学基金(批准号:40003003和40234041)，教育部骨干教师资助计划项目联合资助. |
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| 摘 要： | 秦岭造山带是经历了多阶段的多陆块长期裂解、拼合的复合型造山带。最新的地质、地球化学和同位素年代学综合研究共同揭示沿商丹带分布有中新元古代蛇绿岩,并伴生有与板块俯冲碰撞作用相关的弧后盆地、岩浆弧、高压变质作用,表明北秦岭于中元古代末—新元古代初曾发展成为类似于现代板块构造体制的活动大陆边缘,出现板块向北俯冲消减、弧后盆地的生成和蛇绿岩构造侵位及其后的碰撞造山作用。
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| 关 键 词： | 蛇绿岩 地球化学 年代学 变质作用 北秦岭地块 |
| 文章编号： | 1001-1552(2003)02-0115-10 |
| 修稿时间： | 2002年11月10日 |
THE PROTEROZOIC TECTONIC FRAMEWORK AND EVOLUTION OF THE NORTH QINLING OROGEN, CENTRAL CHINA |
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| DONG Yun peng,ZHANG Guo wei,ZHAO Xia and YAO An ping.THE PROTEROZOIC TECTONIC FRAMEWORK AND EVOLUTION OF THE NORTH QINLING OROGEN, CENTRAL CHINA[J].Geotectonica et Metallogenia,2003,27(2):115-124. |
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| Authors: | DONG Yun peng ZHANG Guo wei ZHAO Xia and YAO An ping |
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| Abstract: | The Qinling orogen is a gigantic composite collision orogenic belt undergoing multistage complicated plate rifting and convergence. The geologic framework is built up through interaction of three blocks, which are North China, South Qinling and South China blocks, and separated by the Shangdan and Mianlue suture zones, respectively. Geology, geochemistry and isotopic chronology of the ophiolite, magmatism and metamorphism show that there exist the Meso Neoproterozoic ophiolite, arc magmatism and back arc basin in south margin of the North Qinling massif. They are combined with the related magmatism, regional metamorphism and chronology of the tectonic events suggest that the had been evolved into an active continental margin with plate rifting, oceanic crust subduction and ophiolite emplacement along the southern margin of the North Qinling massif during the Mesoproterozoic to Neoproterozoic. |
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| Keywords: | Ophiolite Geochemistry Isochron age Metamorphism North Qinling massif |
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