西准噶尔志留纪-泥盆纪弧盆格局的确定及其区域构造演化意义  

Determination of Silurian-Devonian Arc-Basin Pattern in Western Junggar and Its Regional Tectonic Significance

作　　者：杨维[1,2,3] 王国灿[1,2,4] 纵瑞文[2] 肖龙[2] 李理[2] 杨钢[2,5] 

机构地区：[1]中国地质大学地质调查研究院,湖北武汉430074 [2]中国地质大学地球科学学院,湖北武汉430074 [3]贵州省煤田地质局地质勘察研究院,贵州贵阳550008 [4]中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉430074 [5]中国地震局地震研究所地震大地测量重点实验室,湖北武汉430071

出　　处：《地球科学（中国地质大学学报）》2015年第3期448-460,503,共14页Earth Science-Journal of China University of Geosciences

基　　金：中国地质调查局项目"西准噶尔克拉玛依后山地区三维地质调查试点"(No.1212011220245);新疆1:25万铁厂沟镇幅(L45C002001)与克拉玛依市幅(L45C003001)区调修测项目(No.1212011120502)

摘　　要：新疆西准噶尔克拉玛依-额敏一带广泛出露古生代的物质建造,记录着古亚洲洋演化的重要信息.古生代期间特别是晚古生代期间经历了复杂的洋陆转换过程,残留了系列近东西向及北东向蛇绿构造混杂岩系以及古大陆边缘的增生体系,造就了研究区复杂的岩石地层系统.目前对西准噶尔志留系、泥盆系构造古地理属性及志留纪-泥盆纪构造格局的刻画并不够精细.通过详细地野外地质调查及室内数据综合分析,结合前人的研究资料,对西准噶尔克拉玛依-额敏一带志留系及泥盆系代表性的岩石地层的构造古地理属性进行了界定,并在此基础上,对研究区志留纪-泥盆纪的弧盆格局进行探讨.综合分析认为志留纪西准噶尔克拉玛依-额敏一带古亚洲洋开始强烈的俯冲消减,泥盆纪古亚洲洋进入全面俯冲拼贴的演化阶段,形成多块体拼贴增生的多岛弧盆格局.泥盆纪后古亚洲洋在研究区开始进入残余洋盆的演化阶段.Paleozoic substance formations are widespread in Karamay-Emin area of western Junggar in Xinjiang,recording evolution information of Paleo-Asian Ocean.During Paleozoic,and especially the Late Paleozoic,this region has experienced a complex ocean-land transition process.Thus,a series of ophiolitic mélanges with nearly east-west and northeastern trends,and subduction-accretionary complexes of the ancient continental margin have been developed,resulting in the complicated rock formation system in the study area.To better probe into the ancient geographical attributes and structural framework between Silurian and Devonian in western Junggar,we define the tectonic paleogeographic properties of Silurian and Devonian in KaramayEmin area and discuss arc-basin tectonic framework from Silurian to Devonian in western Junggar based on geological surveyand relevant data in this study.The authors suggest that Paleo-Asian Ocean in the Karamay-Emin area began intense subducting in Silurian and widely subduction-collage stage with archipelago arc-basin system in Devonian.Paleo-Asian Ocean along the Karamay-Emin area started its residual oceanic basin evolutionary stage after Devonian.

关 键 词：西准噶尔 志留纪 泥盆纪 弧盆格局 构造古地理 区域构造演化. 

分 类 号：P548[天文地球—构造地质学]