大别-苏鲁造山带在朝鲜半岛的延伸方式--基于^40Ar/^39Ar构造年代学的约束  

The extension of the Dabie-Sulu orogenic belt in Korean Peninsula: Based on ^(40)Ar/^(39)Ar Tectonic chronology

作　　者：武昱东[1] 侯泉林[2] 

机构地区：[1]国土资源部成矿作用与资源评价重点实验室,中国地质科学院矿产资源研究所,北京100037 [2]中国科学院计算地球动力学重点实验室,中国科学院大学地球科学学院,北京100049

出　　处：《岩石学报》2016年第10期3187-3204,共18页Acta Petrologica Sinica

基　　金：科技部国家重点研发计划(2016YFC0600401);国家自然科学基金项目(41210003、41402180);中国地质调查局项目(12120113069000)联合资助

摘　　要：本文结合野外构造变形特征观测,在朝鲜半岛的不同构造单元采集14件糜棱岩和片麻岩样品进行^(40)Ar/^(39)Ar年代学分析,在此基础上通过对比朝鲜半岛与大别造山带不同构造单元的变形特征,探讨大别苏鲁构造带在朝鲜半岛的东延特征,取得如下认识:朝鲜半岛中部的主要构造带在中生代经历了碰撞阶段(~210Ma)、逆冲推覆(200~150Ma)、造山后伸展阶段(140~90Ma)三个主要的构造过程;从变形期次和变形特征看,临津江构造带与大别造山带的北淮阳构造带、苏鲁构造带北部威海地区具有可比性,沃川构造带与南大别构造带有相似之处;在朝鲜半岛,自临津江带至沃川带构成了较完整的中生代碰撞造山带,即大别-苏鲁造山带的东延部分,原认为的"京畿地块"应属造山带的一部分。In this study,^40Ar/^39Ar dating was done on 14 biotites or hornblende mineral separated from mylonites and gneiss in shear belts from different tectonic position of Korean Peninsula.Depending on the deformation characteristics of geological sections and associative tectonic chronology data,comparison was made between Korean Peninsula（ include Rimjingang Belt and Okchon Belt） and Dabie-Sulu orogenic belt,and the eastward extension of Dabie-Sulu orogenic belt was discussed.As a result,Rimjingang belt of Korean Peninsula is similar to Beihuaiyang tectonic belt of North Dabie orogenic belt and north of Sulu belt in deformation characteristics and era,and Okchon belt is similar to South Dabie belt in the same ways.Furthermore,three main Mesozoic tectonic event of Korean Peninsula could be recognized such as： Collide Stage（ T1, ～ 210Ma）,Orogenesis Stage（ T2-J3,200 ～ 150Ma）,Extensional Stage（ K1-2,140 ～ 90Ma）.On these bases,the geologic body between Rimjingang belt and Okchon belt is a holonomic Mesozoic orogene,as the eastern extending part of Dabie-Sulu orogenic belt,and＂Gyonggi Massif＂should be redefined as a part of the orogenic belt.

关 键 词：大别苏鲁造山带 京畿地块 ^40Ar/^39Ar构造年代学 朝鲜半岛 

分 类 号：P542[天文地球—构造地质学] P597.3[天文地球—地质学]