| 兴蒙陆内造山带 |
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| 引用本文： | 徐备,王志伟,张立杨,王智慧,杨振宁,贺跃.兴蒙陆内造山带[J].岩石学报,2018,34(10):2819-2844. |
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| 作者姓名： | 徐备 王志伟 张立杨 王智慧 杨振宁 贺跃 |
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| 作者单位： | 河北地质大学区域地质与成矿作用重点实验室, 石家庄 050031;河北地质大学资源学院, 石家庄 050031,河北地质大学区域地质与成矿作用重点实验室, 石家庄 050031;河北地质大学资源学院, 石家庄 050031,河北地质大学区域地质与成矿作用重点实验室, 石家庄 050031;河北地质大学资源学院, 石家庄 050031,河北地质大学区域地质与成矿作用重点实验室, 石家庄 050031;河北地质大学资源学院, 石家庄 050031,河北地质大学区域地质与成矿作用重点实验室, 石家庄 050031;河北地质大学资源学院, 石家庄 050031,河北地质大学区域地质与成矿作用重点实验室, 石家庄 050031;河北地质大学资源学院, 石家庄 050031 |
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| 基金项目： | 本文受科技部国家重点研发计划（2017YFC0601302）和国家自然科学基金项目（41672214）联合资助. |
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| 摘 要： | 本文提出了"兴蒙陆内造山带"的新概念(Xing-Meng Intracontinent Orogenic Belt,XMIOB),从大地构造、沉积建造、岩浆作用和变质作用等方面论述了XMIOB从晚古生代到中生代初的陆内伸展及陆内造山过程,为探讨晚古生代构造演化提供了新模式。根据对内蒙古中西部晚古生代构造格局的总体认识,可将XMIOB划分为五个构造单元即:早石炭世二连-贺根山裂谷带、晚石炭世陆表海盆地、早二叠世艾力格庙-二连伸展构造带、早-中二叠世盆岭构造带和晚二叠世索伦山-乌兰沟伸展构造带。晚石炭世末-二叠纪在兴蒙造山带基底上发育三期伸展构造:第一期见于内蒙古北部二连-艾力格庙地区,形成陆内裂谷盆地及其盆缘三角洲沉积,发育时代为302～298Ma;第二期在内蒙古中西部广泛分布,以隆起与凹陷相间分布的盆岭构造为特征,发育时代为290～260Ma;第三期见于内蒙古南部索伦山到温都尔庙乌兰沟一带,形成主动裂谷背景下的红海型小洋盆,发育时代为260～250Ma。晚古生代与伸展过程有关的岩浆活动可分四期:1)早石炭世贺根山期:以蛇绿岩为主,发育于具有前寒武纪古老基底和早古生代造山带年轻基底的陆壳伸展区; 2)晚石炭世达青牧场期:主要沿北造山带分布,以基性和酸性岩浆构成的双峰式侵火成岩为特征; 3)早二叠世大石寨期:形成的岩石种类多样,分布广泛,包括双峰式火山岩、双峰式侵入岩和碱性岩; 4)二叠纪末-三叠纪初索伦山期:形成陆缘型蛇绿岩或基性岩-超基性岩组合,产生于软流圈上涌造成的主动裂谷背景。兴蒙陆内造山带的构造变形可分为两期,第一期为晚古生代地层大范围褶皱变形,造成盆-岭构造带的缩短;第二期为沿盆-岭构造的边界强烈剪切变形,产生向东逃逸的挤出构造,其构造背景是北部蒙古-鄂霍茨克造山带和南部大别-秦岭中央造山带的远距离效应引起的被动闭合作用。兴蒙陆内造山带的变质作用分为两个阶段,早期变质作用主要表现为石炭纪期间与陆内伸展有关的低压高温变质,晚期为二叠纪末到三叠纪初区域大面积的低压绿片岩相变质以及沿构造边界的局部中-低压型低温变质。
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| 关 键 词： | 兴蒙陆内造山带 兴蒙造山带 晚古生代 伸展构造 构造演化 |
| 收稿时间： | 2018/5/1 0:00:00 |
| 修稿时间： | 2018/8/1 0:00:00 |
The Xing-Meng Intracontinent Orogenic Belt |
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| XU Bei,WANG ZhiWei,ZHANG LiYang,WANG ZhiHui,YANG ZhenNing and HE Yue.The Xing-Meng Intracontinent Orogenic Belt[J].Acta Petrologica Sinica,2018,34(10):2819-2844. |
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| Authors: | XU Bei WANG ZhiWei ZHANG LiYang WANG ZhiHui YANG ZhenNing and HE Yue |
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| Institution: | Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang 050031, China;College of Resources, Hebei GEO University, Shijiazhuang 050031, China,Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang 050031, China;College of Resources, Hebei GEO University, Shijiazhuang 050031, China,Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang 050031, China;College of Resources, Hebei GEO University, Shijiazhuang 050031, China,Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang 050031, China;College of Resources, Hebei GEO University, Shijiazhuang 050031, China,Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang 050031, China;College of Resources, Hebei GEO University, Shijiazhuang 050031, China and Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang 050031, China;College of Resources, Hebei GEO University, Shijiazhuang 050031, China |
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| Abstract: | In this paper, a new concept of "Xing-Meng Intracontinent Orogenic Belt" (XMIOB) is suggested. The Late Paleozoic to Early Mesozoic intra-continental extension and orogenic evolution of the XMIOB are synthesized from the perspective of tectonics, sedimentary formation, magmatism and metamorphism, which provides useful insight into the Late Paleozoic tectonic evolution of XMIOB. According to the Late Paleozoic tectonic framework of mid-western Inner Mongolia, five tectonic units can be recognized, including the Early Carboniferous Erenhot-Hegenshan rift belt (C1EHR), the Late Carboniferous inland sea basin (C2IS), the Early Permian Airgin Sum-Erenhot extensional belt (P1AEEB), the Early-Middle Permian basin-range belt (P1-2BRB), and the Late Permian Solonker-Ulan valley extensional belt (P3SWEB). From the Late Carboniferous to Permian, the extensional structures in the XMIOB can be clustered into three stages. The first stage can be found in Erenhot-Airgin Sum area, northern Inner Mongolia, in form of intracontinental rift basin and its marginal delta deposits during 302~298Ma. The second stage is characterized by basin-range structure during 290~260Ma, which are widely distributed in mid-western Inner Mongolia. The third stage can be observed at Solon Obo, southern Inner Mongolia and Ulan valley in the south of Ondor Sum, representing a Red Sea-type oceanic basin in active rifting zone during 260~250Ma. The extension-related magmatism during the Late Paleozoic includes four phases:1) The Early Carboniferous Hegenshan ophiolite phase, which developed on the basement of pre-Cambrian or Early Paleozoic orogenic belt, reflects deep magmatic process in the continent crust; 2) The igneous rock originated from the Late Carboniferous Daqing pasture phase are widely distributed along the north orogenic belt, characterized by bimodal intrusive and volcanic rocks that mainly consist of mafic and felsic magma; 3) The Early Carboniferous Dashizai phase formed various rocks including bimodal volcanic, intrusive and alkaline rocks; 4) The Late Permian-Triassic Solonker phase is characterized by continental margin ophiolite or the rock assemblage of mafic and ultramafic rock, which results from an active rift zone in during the asthenosphere upwelling. The XMIOB underwent two phases of structure deformation. The first phase, in form of large scale fold deformation of the Late Paleozoic strata, gave rise to shortening of the basin-ridge structure belt. The second one produced strong shear deformation along the boundary of the basin-range structure belt, accompanied by eastward extrusion structure due to a passive closure resulted from the remote tectonic effect of the North Mongolia-Okhotsk orogenic belt in the north and the Dabie-Qinling central orogenic belt in the south. Two periods of metamorphism can be identified in the XMIOB since the Late Paleozoic. The Early period is represented by special low pressure and high temperature metamorphism that records intra-continental extensional process during the Carboniferous. The latter metamorphism is characterized by regional scale greenschist facies metamorphism and middle-low pressure metamorphism along the tectonic boundary from the Late Permian to Early Triassic. |
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| Keywords: | Xing-Meng Intracontinent Orogenic Belt Xing-Meng Orogenic belt Late Paleozoic Extensional structure Tectonic evolution |
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