| A DISCUSSION ON THE STRUCTURE AND TECTONIC EVOLUTION OF THE ALTUN OROGENIC ZONE |
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| 作者姓名： | Liu Liang Che Zicheng Luo Jinhai Wang Yan Chen Danling[WT ”BX] |
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| 作者单位： | Department of geology，Northwest University，Xi'an 710069，China |
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| 摘 要： | A DISCUSSION ON THE STRUCTURE AND TECTONIC EVOLUTION OF THE ALTUN OROGENIC ZONE
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A DISCUSSION ON THE STRUCTURE AND TECTONIC EVOLUTION OF THE ALTUN OROGENIC ZONE |
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| Liu Hang,et al.A DISCUSSION ON THE STRUCTURE AND TECTONIC EVOLUTION OF THE ALTUN OROGENIC ZONE[J].Earth Science Frontiers,2000(Z1). |
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| Authors: | Liu Hang |
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| Abstract: | The Altun faulted Zone has been focused by lots of geologists for many years because it lies in a boundary area of several main tectonic units in the western China and is a geographically northern boundary line of Tibet plateau.The latest achievements show that the Altun faulted zone is not only a Cenozoic strike\|slip faulted system but also an orogenic zone which underwent mutually subduction\|collision among paleo\|plates (or terrains) in its early stage and consists of geological bodies of different ages and tectonic environments. Based on the results of geological characteristics,petrology, geochemistry and isotopic dating, the Altun Orogenic Zone can be divided into four tectonic units and is considered to have undergone five stages during its tectonic evolution.The four tectonics units are :(1) Abei metamorphic block, which consists of Archean metamorphic complex of granulite facies;.(2) Hongliugou—Lapeiquan tectonic melange belt, which is composed of ophiolite blocks(belt), OIB blocks, pelagic silicalite, shallow\|bathyal sedimentary rock blocks and high\|pressure metamorphi c rock blocks. (3) Milanhe—Jinyanshan island\|arc block, which consists of mid\|uplifting belt and the south and north active margins. The uplifting belt is composed of metasandstone, marble, overlying thick stromatolite (Jinyanshan Group of Jixian System). Metamorphic rocks of 450Ma occur in both south and north hactive margin. Post\|collision bimodal volcanic rocks and A\|type granite occur in the middle and the north side.(4) Apa—Mangya tectonic melange belt, which consists of ophiolite(including ultramafic rocks, gabbro, plagiogranite and basalt) and flysch and eclogite of late Ordovician. |
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| Keywords: | tectonic evolution Altun orogenic zone |
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