SiO2-saturated potassic alkaline magmatism in the central Amazonian Craton, southernmost Uatumã-Anauá Domain, NE Amazonas, Brazil

ABSTRACT: This paper approaches the record of SiO2-saturated potassic alkaline magmatism of Castanhal Quartz Monzonite, Mapuera Suite, and Ladeira da Vovó Quartz Syenite. These samples are located near the Northern border of the Amazon Basin. Such rocks show K2O + 2 > Na2O and K2O/Na2O

摘要：本文针对卡斯坦哈尔石英二长岩（Castanhal Quartz Monzonite）、马普埃拉岩套（Mapuera Suite）以及拉德拉达沃沃石英正长岩（Ladeira da Vovó Quartz Syenite）的二氧化硅（SiO₂）饱和钾质碱性岩浆作用记录展开研究。上述采样点位位于亚马孙盆地（Amazon Basin）北部边界附近。此类岩石满足K₂O + 2 > Na₂O 且 K₂O/Na₂O