| 滇西北云岭陆缘弧大地构造单元的划分与特征 |
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| 引用本文： | 王学武,刘凤祥,李新仁,严城民,周喜林,王长兵.滇西北云岭陆缘弧大地构造单元的划分与特征[J].地质与资源,2017,26(3):229-233. |
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| 作者姓名： | 王学武 刘凤祥 李新仁 严城民 周喜林 王长兵 |
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| 作者单位： | 1. 云南省核工业209地质大队, 云南 昆明 650032;2. 云南省地质矿产局区域地质矿产调查大队, 云南 玉溪 653100 |
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| 基金项目： | 中央地质勘查基金项目“云南省维西县海尼地区铀矿普查” |
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| 摘 要： | 为进一步查明滇西北云岭陆缘弧的地质构造特征,经实地调研与资料收集整理,将该区划分为6个四级大地构造单元.即:雪龙山岩群(Pt_1Xl)、德钦断块(Pz_1)、攀天阁酸性火山岩浆弧(T_2)、工农弧间盆地(T_2)、崔依比中基性火山岩浆弧(T_(1-2))、鲁甸火山弧-同碰撞花岗岩(T).前2个单元属岛弧基底,后4个单元属岛弧主体.各单元的岩石组合、变形变质特征有明显差异.岛弧主体形成于早三叠世—晚三叠世早期,是金沙江洋盆向西俯冲消减、碰撞造山的产物.岛弧主体之上被上三叠统角度不整合覆盖.
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| 关 键 词： | 云岭陆缘弧 大地构造单元 地质特征 滇西北 |
| 收稿时间： | 2016-07-18 |
DIVISION AND CHARACTERISTICS OF THE GEOTECTONIC UNITS OF YUNLING EPICONTINENTAL ARC IN NORTHWEST YUNNAN |
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| WANG Xue-wu,LIU Feng-xiang,LI Xin-ren,YAN Cheng-min,ZHOU Xi-lin,WANG Chang-bing.DIVISION AND CHARACTERISTICS OF THE GEOTECTONIC UNITS OF YUNLING EPICONTINENTAL ARC IN NORTHWEST YUNNAN[J].Geology and Resources,2017,26(3):229-233. |
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| Authors: | WANG Xue-wu LIU Feng-xiang LI Xin-ren YAN Cheng-min ZHOU Xi-lin WANG Chang-bing |
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| Institution: | 1. No. 209 Geological Party, Yunnan Bureau of Geology for Nuclear Industry, Kunming 650031, China;2. Regional Geological Survey Party, Yunnan Bureau of Geology and Mineral Resources, Kunming 653100, China |
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| Abstract: | With field survey and data processing,the structural characteristics of the Yunling epicontinental arc in Northwest Yunnan are clarified.This region is divided into 6 four-grade tectonic units,i.e.Xuelongshan Rock Group (Pt1Xl),Deqing Blocks (Pz1),Pantiange acidic volcanic magmatic arc (T2),Gongnong inter-arc basin (T2),Cuiyibi intermediate-basic volcanic magmatic arc (T1-2),and Ludian volcanic arc-syn-collisional granite (T).The former two units belong to the basements of island arcs;while latter four,the main bodies.The rock associations and deformationmetamorphism of each unit are various obviously.The main bodies of island arcs were formed from Early Triassic to early Late Triassic,as a product of the westward subduction and collisional orogeny of Jinshajiang ocean basin.The main bodies of island arcs are covered by Upper Triassic strata in angular unconformity. |
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| Keywords: | Yunling epicontinental arc geotectonic unit geological characteristics Northwest Yunnan |
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