| 东秦岭二郎坪弧后盆地双向式俯冲特征 |
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| 引用本文： | 李亚林,宋传中.东秦岭二郎坪弧后盆地双向式俯冲特征[J].高校地质学报,1998,4(3):286-293. |
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| 作者姓名： | 李亚林 宋传中 |
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| 作者单位： | [1]西北大学地质系 [2]合肥工业大学地质系 |
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| 摘 要： | 二郎坪弧后盆地是北秦岭早生古代活动大陆边缘沟－弧－盆系统的重要组成部分，现今二郎坪岩群是古弧后盆地的物质残存，记录了盆地演化方式和过程，沉积建造和岩浆作用研究发同，在二郎坪弧后盆地南北两侧各发育一套活动型陆缘沉积体系和一系列府冲型花岗岩，变形构造解析反映出主造山期早期沿弧后盆地两侧各形成一套韧性推覆构造系，并具对冲型几何学样式，为俯冲带典型构造，综合分析表明，弧后盆地在造山早期分别俯冲于南部秦岭古岛弧和北部宽坪古陆之下，具双向式俯冲特征。
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| 关 键 词： | 二郎坪岩群 弧后盆地 构造环境 双向式俯冲 盆地 |
| 收稿时间： | 1998-09-20 |
| 修稿时间： | 1998-09-20 |
CHARACTERISTICS OF BIDIRECTIONAL SUBDUCTION OF ERLANGPING BACKARC BASIN IN THE EAST QINLING |
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| Li Yalin,Zhang Guowei,Song Chuanzhong.CHARACTERISTICS OF BIDIRECTIONAL SUBDUCTION OF ERLANGPING BACKARC BASIN IN THE EAST QINLING[J].Geological Journal of China Universities,1998,4(3):286-293. |
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| Authors: | Li Yalin Zhang Guowei Song Chuanzhong |
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| Institution: | 1. Department of Geology, Northwest University, Xi’an 710069; 2. Department of Geology. Hefei Polytechnical University, Hefei 230009 |
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| Abstract: | The Erlangping back arc basin was an important part of the North Qinling active continental margin in early Palaeozoic Era The Erlangping Group is the remains of back arc basin,and records its evolution Analysis of the sedimentary textures demonstrated that the Southern and Northern clastic sedimentary rocks were formed in different active continental margin Besides,there are two series of subdutional granites which distributing along the two boundaries of Erlangping back arc basin Tectonicly,the main orogenic period of deformation can be devided into an early stage and a late stage Two sets of thrust ductile deformation were formed in early stage while the complex tight folds were formed in late stage The characteristics of sedimentation,magmatism and deformation all indicate that this back arc basin is characterized by bidirectional subduction during late Palaeozoic Era,i e ,a subduction downward to the Kuanping ancient continent,and another downward to the Qinling ancient island arc |
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| Keywords: | Erlangping Group back arc basin tectonic setting bidirectional subduction |
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