前寒武纪早期朝鲜半岛地壳的形成与演化——古陆的形成阶段(Ar-Pt_1)

Formation and evolution of Early Precambrian crust in Korean Peninsula―formation stages of palaeocontinent(Ar—Pt_1)

通过对朝鲜半岛前寒武纪结晶基底变质岩的岩石学、年代学和大地构造学分析，提出太古宙-古元古代是古陆的形成阶段（Ar—Pt1），可分为3个阶段：古陆核的形成阶段（Ar1-Ar3）、狼林微陆块的形成阶段（Ar4）和古陆的形成阶段（Pt1）。在朝鲜半岛发现的古老地壳岩石位于南浦-甑山和松原地区，其中最老的岩石位于甑山地区，年龄为3．4—3．6Ga（3503±123Ma），相当于古太古代（Ar2）；松原地区分布着稍年轻的岩石（2．9～3．1Ga），相当于中太古代（Ar3）。古陆核形成于朝鲜半岛北部的南浦一甑山和松原地区，包括狼林地块和京畿地块的朝鲜半岛太古宙岩石大部分形成于新太古代，中朝古陆的主体形成于太古宙末。古元古代末（约1600或1800Ma），随着摩天岭海闭合，狼林微陆块与冠帽微陆块通过碰撞聚合而形成一个整体，称为摩天岭运动（可以对比中国的吕梁运动）。摩天岭运动结束后，朝鲜半岛作为中朝古陆的一部分，整体进入相对稳定的地壳演化阶段。

Through the analysis of petrology, chronology and geotectonics of Precambrian crystalline basement metamorphic rocks in Korean Peninsula, it is considered that Archean and Paleoproterozoie are the formation stages of palaeocontinent （ Ar-Pt1）, which can be divided into three stages： formation stage of palaeocontinental core （ Ar1-Ar3 ）, formation stage of Rangrim microcontinent （ Ar4 ） and formation stage of palaeocontinent （ Pt1）. The ancent crustal rocks of Korean Peninsula were located in Nampo-Zungsan and Songwon regions, the oldest known rock distributes Zungsan region with the age 3.4 -3.6 Ga （3 503 ±123 Ma）, corresponding to Palaeoarchean （Ar2 ）, while the slightly younger rock （2.9 -3.1 Ga） distributes Songwon region, corresponding to Middle Archean （ Ar3 ）. Palaeocontinental core was formed in Nampo-Zungsan and Songwon regions of northern Korean Pen-insula. The Archean rocks of Korean Peninsula, including Rangrim and Gyonggi massifs, almost formed in Neoarchean, and the main part of China-Korea paleocontinent was formed at the end of Archean. At the end of Palaeo-proteromie （ca. 1 600 Ma or 1 800 Ma）, along with the Machonlyong Sea closed, the Rangrim and Gwanmo microcontinents became a whole massif through collision, which called Machonlyong motion （ corresponding to Luliang motion in China）. After Maehonlyong motion, the Korea Peninsula as one part of China-Korea paleocontinent entered into relatively stable evolution stage.