| 老挝及邻区构造单元划分与构造演化 |
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| 引用本文： | 王,宏 林方成 李兴振 施美凤.老挝及邻区构造单元划分与构造演化[J].中国地质,2015(1):71-84. |
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| 作者姓名： | 王 宏 林方成 李兴振 施美凤 |
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| 作者单位： | 中国地质调查局成都地质调查中心, 四川 成都 610081 |
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| 基金项目： | 中央地勘基金境外矿产资源风险勘查项目 ([2011]D3-03)和中国地质调查局国土资源大调查项目 (1212011120337)联合资助。 |
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| 摘 要： | 藏东南三江—印支地区是世界构造地质研究的热点地区之一,而老挝位于中南半岛中北部,相比于周边邻区地质研究程度较低。文章结合近年来参加项目研究成果,综合前人研究资料,通过区域对比分析,总结归纳区内各构造单元的延伸趋势及其相互关系,对老挝及邻区进行构造单元划分,并初步概括了老挝及邻区的大地构造演化史。基于区域构造-岩石组合的分布发育及时空属性特征,文章将该区划分为7个三级构造单元:景洪—素可泰火山弧、难河—程逸缝合带、思茅—彭世洛地块、奠边府—黎府缝合带、万象—昆嵩地块、色潘—三岐缝合带、长山地块。研究区在不同地质历史阶段具有多重大地构造属性,总体上经历了3个重要大地构造演化阶段:前特提斯演化、特提斯演化和中新生代陆内演化阶段。前特提斯演化时期,主体表现为昆嵩、长山古地块的形成,一直到早古生代都具有亲扬子—华南地块的大地构造属性。自中晚古生代至早中生代为古特提斯演化时期,表现为以奠边府—黎府洋、色潘—三岐洋、难河—程逸弧后洋及邻区马江洋为主导的洋陆构造演化格局。晚中生代—新生代则为板内伸展、走滑、地壳物质均衡调整及伴生的盆地形成、碱性岩浆活动等作用期,也是区内现今地质构造格局的定形期。
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| 关 键 词： | 构造单元划分 构造演化 老挝 东南亚 |
The division of tectonic units and tectonic evolution in Laos and its adjacent regions |
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| WANG Hong,LIN Fang-cheng,LI Xing-zhen,SHI Mei-feng.The division of tectonic units and tectonic evolution in Laos and its adjacent regions[J].Chinese Geology,2015(1):71-84. |
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| Authors: | WANG Hong LIN Fang-cheng LI Xing-zhen SHI Mei-feng |
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| Affiliation: | Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China |
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| Abstract: | Abstract: Structural research on the Sanjiang-Indosinian region of southeast Tibet has aroused much interest among geologists all over the world. However, Laos, which is located in north-central Indochina peninsula, remains insufficiently studied in comparison with neighboring China, Thailand and Vietnam. Combined with the latest project research results as well as the previous research data, the authors preliminarily made division of tectonic units and summarized tectonic evolution of Laos and adjacent regions through the regional comparative analysis and the study of the extension trends of individual tectonic units and their interrelations. On the basis of the temporal-spatial distribution nature of the regional structure-rocks, the authors divided the study area into 7 third grade structural units, i.e., Jinghong-Sukhothai arc block, Nam-Uttaradit suture, Simao-Phitsanulok block, Dien bien phu-Loei suture, Vientiane-Kontum block, Sepon-Tam Ky suture, and Truongson block. The study area had multiple tectonic natures during different geological stages. On the whole, the study area has experienced three important tectonic evolution stages, i.e., Pre-Tethys, Tethys, and Meso-Cenozoic intracontinental stages. During the Pre-Tethys evolution which lasted to Early Paleozoic, mainly rigid Kontom and Truongson block came into being, which had affinity to the Yangtze-South China block. From the Late Paleozoic-Early Mesozoic, the study area became a part of the Tethyan domain with the opening of Paleo-Tethys, which showed an ocean-land tectonic framework that led to the formation and evolution of Dien bien phu-Loei Ocean, Sepon-Tam Ky Ocean, Nam-Uttaradit arc-back Ocean and Song Ma Ocean. Late Mesozoic-Cenozoic was a period during which modern geological structure framework began to form, and there existed intraplate extension, strike-slipping, crustal mass isostatic adjustment, basin formation and coeval alkaline magmatic activities. |
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| Keywords: | division of tectonic units tectonic evolution Laos Southeast Asia |
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