朝鲜半岛及华北上元古界-古生界沉积序列与碎屑锆石年代学记录及其构造属性分析  

The Upper Proterozoic-Paleozoic records of sedimentary sequences and detrital zircon geochronology in Korean Peninsula and North China: Implications for tectonic attributes and division

作　　者：李忠[1,2] 倪玲梅 徐建强[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院大学,北京100049

出　　处：《岩石学报》2016年第10期3139-3154,共16页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(40672083;40234050;41210003)资助

摘　　要：通过地层结构、沉积序列与碎屑锆石年代学记录等三方面的成因分析和区域对比,本文进一步探究了中-朝地块新元古代-古生代的构造属性及演化信息。研究指出,朝鲜半岛平南盆地、太白山盆地以及华北地块内部,其地层结构-沉积相序主要以寒武-奥陶系内陆架碳酸盐岩沉积、志留-泥盆系缺失、中上石炭统-二叠系海陆交互相含煤沉积为特征,并具有可对比的1.85Ga、2.5Ga以及1.15Ga、1.6Ga等碎屑锆石年龄峰值。而在临津江带、沃川带以及华北东南缘,则以泥盆-石炭系泥岩/片岩、中基性火山岩及火山碎屑岩、碳酸盐岩(透镜体)混杂发育为特征,总体显示外陆架沉积环境,且具有可对比的与地层时代接近的最小碎屑锆石年龄,这也是对沉积期较强构造-岩浆活动的反映。综合地层结构、相序、碎屑锆石年龄组成以及聚煤记录,提出朝鲜半岛与华北应属于统一的一级构造单元,即"中-朝板块";但朝鲜半岛西南部及华北东南缘毗邻板块边缘,因此其地层-沉积记录与板内存在差异,简单的一致性模式并不适用。Based on genetic analysis and correlation of stratigraphic frameworks, depositional sequences and detrital zircon chronological records,the paper further explored the Neoproterozoic-Paleozoic tectonic attributes and evolutional informations of SinoKorean blocks.For the Pyeongnam and Tabeaksan basins,Korean Peninsula,and interior of North China block,their stratigraphic frameworks and depositional sequences are mainly characterized by the Cambrian-Ordovician inner continental shelf carbonate deposition,Silurian-Devonian non-deposition and middle-upper Carboniferous-Permian littoral coal-bearing deposition,in which the comparable age peaks of detrital zircons,including 1.85 Ga,2.5 Ga,1.15 Ga and 1.6 Ga,occur in the most sandstone samples of the Neoproterozoic-Paleozoic strata.However,for the Imjingang and Okcheon belts,Korean Peninsula,and southeast margin of North China block, their stratigraphic units are mainly composed by the Devonian-Carboniferous mudstones/schists, intermediate basic volcanics and pyroclastic rocks,generally characterized by depositional environments of outer continental shelf,with the comparably minimum age peaks close to the stratigraphic time ranges,also reflecting strong tectonic-magmatic activities during sedimentary stages.Therefore,it is presented that Korean Peninsula and North China are both belong to the first-order tectonic unit,that is,Sino-Korean Plate.However,due to southwestern Korean Peninsula and southeastern North China near to the plate margin,unstable/active tectonic regions,their stratigraphic-depositional records are obviously different those in the plate interior,indicating no identical stratigraphicdepositional model between them.

关 键 词：地层结构 沉积序列 碎屑锆石年龄 构造属性 朝鲜半岛 华北 

分 类 号：P535[天文地球—古生物学与地层学] P597.3[天文地球—地质学]