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通过对北武夷地区前寒武系变质岩的岩石化学、稀土元素及微量元素等综合研究 ,从中元古代铁沙街岩组、周潭岩组到晚震旦世至早寒武世万源组、洪山组、外管坑组 ,SiO2 、K2 O、K2 O/Na2 O等具有逐渐增大的趋势 ,而TiO2 、Al2 O3 、FeO、MgO、Na2 O及SiO2 /Al2 O3 则逐渐减小 ;ΣLREE/ΣHREE增加 ,而ΣREE总体具减小趋势 ;Sc、Ba、Rb、Cu、Cr等微量元素含量增大 ,而Ni、Th、U、Ta、Nb、Ga、Zr、Hf、V、Zn、Co等则减少。本文利用地球化学参数判别本区前寒武系岩石形成构造环境为被动大陆边缘。
Through the comprehensive study on the petrochemistry, rare earth elements and trace elements of the Precambrian metamorphic rocks in the North Wuyi area, from the Middle Proterozoic Tieshajieyan Formation and the Zhoutan Formation to the Late Sinian to Early Cambrian Wanyuan Formation, SiO2, K2O, K2O / Na2O and so on, but the contents of TiO2, Al2O3, FeO, MgO, Na2O and SiO2 / Al2O3 gradually decreased; ΣLREE / ΣHREE While the content of trace elements such as Sc, Ba, Rb, Cu and Cr increased while the contents of Ni, Th, U, Ta, Nb, Ga, Zr, Hf, V, Zn and Co increased cut back. In this paper, geochemical parameters are used to determine the tectonic setting of Precambrian rocks in this area as the passive continental margin.