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引言瑞典的前寒武系为研究1.9—1.6Ga 期间的地壳演化过程提供了一个良好的机会。这部分元古界包括斯维科卡雷尔带(1.9—1.7Ga)和随后的后斯维科卡雷尔带(1.75—1.65Ga)。Wilson(1982)根据已发表的花岗岩类地球化学和同位素数据提出,岩浆的产生可能与板块构造运动有关,先是约1.9Ga 出现的与俯冲有关的岩浆作用早期相,接着是约1.75Ga 产生了主要为地壳源的岩浆。沿新的斯维科卡雷尔变质带的边缘出现的俯冲作用的另一个阶段,可能
Introduction The Precambrian in Sweden provided a good opportunity to study the crustal evolution during the 1.9-1.6Ga period. This part of the Proterozoic includes the Sveco Carrell Band (1.9-1.7Ga) followed by the Svideo Carrel Band (1.75-1.65Ga). Based on published geochemical and isotopic data of granitoids, Wilson (1982) suggested that magmatic production may be related to the tectonic movement of the plate tectonics. The first subduction-related magmatism at about 1.9Ga occurred, followed by about 1.75Ga, resulting in a major The crust is the source of magma. Another stage of subduction occurring along the edge of the new Sverkorell-Karel metamorphic belt may be