| 东天山大地构造及演化--1:50万东天山大地构造图简要说明 |
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| 引用本文： | 冯益民,朱宝清,杨军录,张开春.东天山大地构造及演化--1:50万东天山大地构造图简要说明[J].新疆地质,2002,20(4):309-314. |
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| 作者姓名： | 冯益民 朱宝清 杨军录 张开春 |
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| 作者单位： | 中国地质调查局西安地质矿产研究所,陕西,西安,710054 |
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| 基金项目： | 中国地质调查局国土资源大调查项目(0499210196)资助,中国地质调查局地调项目“东天山地区构造演化及成矿背景研究”(0499210196)部分研究成果 |
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| 摘 要： | 以东天山地区古生代沉积建造分析为基础,探讨了该区古生代以来的大地构造格局和演化历程。认为该区震旦－泥盆纪具板块构造格局,石炭纪－早二叠世属碰撞期后的板内裂谷和裂陷槽。提出早古生代早中期该区曾古亚洲洋中的一个古老陆块（隶属准噶尔地块）,随着阿尔曼特洋盆和米什沟－干沟洋盆关闭,拼接到阿尔泰古陆边缘,成为西伯利亚古大陆的增生边缘。志留纪－早泥盆世沿卡拉麦里一带再次裂解,形成了卡拉麦里有限洋盆,将南准噶尔地块从西伯利亚大陆边缘割裂开来。随着卡拉麦里洋盆的向南俯冲,造成了东天山地区大南湖一带的泥盆纪岛弧杂岩带,构成了东天山地区斑岩铜矿的含矿岩系,中泥盆世末卡拉麦里洋盆关闭。早石炭世进入碰撞期后板内伸展阶段,形成一系列裂陷槽和裂谷,晚二叠世开始进入陆内造山阶段。新生代随着印度板块同欧亚大陆的碰撞,开始隆升。
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| 关 键 词： | 东天山地区 大地构造 大地构造图 古生代 沉积建造 成矿作用 成矿环境 |
| 文章编号： | 1000-8845(2002)04-309-06 |
| 修稿时间： | 2002年7月1日 |
TECTONICS AND EVOLUTION OF THE EASTERN TIANSHAN MOUNTAINS-A BRIEF INTRODUCTION TO "TECTONIC MAP(1: 500 000) OF THE EASTERN TIANSHAN MOUNTAINS OF XINJIANG |
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| FENG Yi-min,ZHU Bao-qing,YANG Jun-lu,ZHANG Kai-chun.TECTONICS AND EVOLUTION OF THE EASTERN TIANSHAN MOUNTAINS-A BRIEF INTRODUCTION TO "TECTONIC MAP(1: 500 000) OF THE EASTERN TIANSHAN MOUNTAINS OF XINJIANG[J].Xinjiang Geology,2002,20(4):309-314. |
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| Authors: | FENG Yi-min ZHU Bao-qing YANG Jun-lu ZHANG Kai-chun |
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| Abstract: | A brief introduction is given to "Tectonic map of the eastern Tianshan mountains of Xinjiang in scale 1 : 500000". The tectonic framework and evolution of the eastern Tianshan mountains (ETM) since the early Paleozoic are discussed based on analyses of Paleozoic sedimentary and volcano-sedimentary formations. Tectonically, ETM belongs to plate tectonic system from the Sinian to Devonian periods. From Carbonifeous to Early Permian ETM was shaped by rifting and rift troughs, belonging to post-collisional intra-plate extensional system. During the early-middle stage of Early Paleozoic ETM was a block in the paleo-Asia Ocean as part of the Junggar block. The subsequent accretion to the margin of the Altay paleo-continent led to formation of an accreted margin of Siberian paleo-continent. Due to breakup along the Karamaili from the Silurian to Early Devonian and formation of Karamaili Ocean, ETM separated from Siberian paleo-continent again. Southward subduction of the Karamaili Ocean during Devonian period results in generation of the Dananhu-Tousuquan island arc. Ore-bearing rocks yielding porphyry copper in ETM are composed of island arc complexes. The Karamaili Ocean was closed during the end of Middle Devonian. Post-collisional within-plate extension started since Early carboniferous, accompanied by rifting and formation of rift troughs. Intra-continental orogeny was initiated since Late Permian, and uplift occurred during the Cenozoic due to Indian-Eurasian collision. |
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| Keywords: | the eastern Tianshan mountains tectonics evolution tectonic map |
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