伊宁地块石炭纪火山岩及其对构造演化的约束
发布时间：2019-02-27 07:58
【摘要】：西天山伊宁地块的构造格局及其演化之认识久存争议,倍受关注。分歧焦点有三:(1)石炭纪有无洋盆存在?(2)若有洋盆,何时闭合?(3)"沟-弧-盆"消亡时究竟是单向俯冲还是双向俯冲?若是单向俯冲,俯冲方向是由北向南或是相反(即俯冲极性)?因此,这些重大地质问题均聚焦于本区的火山岩。石炭纪火山岩是伊宁地块中的最主要建造和指示构造演化的关键层位,争论长久而激烈。本文认为,伊宁地块早石炭世发育弧前-岛弧-弧后盆地钙碱性火山-沉积建造,是塔里木板块北缘的主要组成部分;而晚石炭世碱性系列双峰式火山岩及其沉积组合则是大陆裂谷火山-沉积建造,形成于区域性伸展构造环境,是准噶尔板块与塔里木板块缝合后的陆内建造,因而古洋盆的关闭时限是早石炭世晚期(鄯善运动)。依据区内早石炭世建造的空间分布和变化规律,作者们认为古天山洋盆与当今地学界作为典型的日本沟-弧-盆体系有着极好的相似性和空间分布可对比性。石炭纪火山岩为本区的构造演化研究提供了重要的约束信息。
[Abstract]:The understanding of the tectonic framework and evolution of the Yining block in the West Tianshan Mountains has been controversial for a long time, which has attracted much attention. There are three focal points of divergence: (1) is there an ocean basin in Carboniferous? (2) if there is an ocean basin, when it is closed? (3) when the trench-arc-basin dies, is it a one-way subduction or a two-way subduction? If it is a one-way subduction, is the direction of the subduction going from north to south or the opposite (that is, the polarity of the subduction)? Therefore, these major geological problems focus on volcanic rocks in this area. Carboniferous volcanic rocks are the most important strata of formation and indication of tectonic evolution in the Yining massif, which are controversial for a long time. In this paper, it is considered that the calc-alkaline volcanic-sedimentary formation of the early Carboniferous pre-arc-island-back-arc basin in the Yining block is the main component of the northern margin of the Tarim plate. The bimodal volcanic rocks of the late Carboniferous alkaline series and their sedimentary assemblages are continental rift volcanoes-sedimentary formations formed in the regional extensional tectonic environment, and are intracontinental formations after suture of the Junggar plate and the Tarim plate. Therefore, the closing time of the paleo-ocean basin is the late early Carboniferous (Shanshan movement). According to the spatial distribution and variation law of the early Carboniferous in the area, the authors believe that the ancient Tianshan ocean basin has excellent similarity and spatial distribution as a typical Japanese trench-arc-basin system. Carboniferous volcanic rocks provide important constraint information for the study of tectonic evolution in this area.
【作者单位】： 长安大学地球科学与资源学院;国土资源部岩浆作用成矿与找矿重点实验室;
【基金】：国家自然科学基金项目(41273033、41303027) 中央高校基金项目(310827153407) 新疆维吾尔自治区地质专项(Y15-1-LQ01)联合资助
【分类号】：P588.14
[Abstract]:The understanding of the tectonic framework and evolution of the Yining block in the West Tianshan Mountains has been controversial for a long time, which has attracted much attention. There are three focal points of divergence: (1) is there an ocean basin in Carboniferous? (2) if there is an ocean basin, when it is closed? (3) when the trench-arc-basin dies, is it a one-way subduction or a two-way subduction? If it is a one-way subduction, is the direction of the subduction going from north to south or the opposite (that is, the polarity of the subduction)? Therefore, these major geological problems focus on volcanic rocks in this area. Carboniferous volcanic rocks are the most important strata of formation and indication of tectonic evolution in the Yining massif, which are controversial for a long time. In this paper, it is considered that the calc-alkaline volcanic-sedimentary formation of the early Carboniferous pre-arc-island-back-arc basin in the Yining block is the main component of the northern margin of the Tarim plate. The bimodal volcanic rocks of the late Carboniferous alkaline series and their sedimentary assemblages are continental rift volcanoes-sedimentary formations formed in the regional extensional tectonic environment, and are intracontinental formations after suture of the Junggar plate and the Tarim plate. Therefore, the closing time of the paleo-ocean basin is the late early Carboniferous (Shanshan movement). According to the spatial distribution and variation law of the early Carboniferous in the area, the authors believe that the ancient Tianshan ocean basin has excellent similarity and spatial distribution as a typical Japanese trench-arc-basin system. Carboniferous volcanic rocks provide important constraint information for the study of tectonic evolution in this area.
【作者单位】： 长安大学地球科学与资源学院;国土资源部岩浆作用成矿与找矿重点实验室;
【基金】：国家自然科学基金项目(41273033、41303027) 中央高校基金项目(310827153407) 新疆维吾尔自治区地质专项(Y15-1-LQ01)联合资助
【分类号】：P588.14
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