【摘要】 阐述了蒙库早泥盆世火山沉积盆地的构造特征。通过对该盆地火山沉积构造演化及其与成矿关系的研究,其结果认为,该盆地是一个明显的非对称的陆内裂谷,其火山沉积构造演化过程可划分为二个阶段:早期石英角斑质火山沉积阶段和晚期细碧-角斑质火山沉积阶段。由于蒙库铁矿床的喷流沉积成矿作用主要发生在第二个火山沉积构造演化阶段,因此铁矿床集中产于向斜构造的核部地层,并与细碧-角斑岩建造关系密切。后期的变质变形-岩浆侵入作用又对海底喷流沉积矿床起到了明显的改造-叠加富集成矿作用。更多还原

【Abstract】 The structure characteristics of Early Devonian volcanic sedimentary basin were discussed and the evolution of the volcanic sedimentary structure of the basin and its association with mineralization were studied in the paper.The result shows that the basin is a obvious non-symmetry continental rift,whose volcano-sedimentary-structural evolvement may be divided into the two stages: the early quartz-keratophyre volcanic-sedimentary stage and the late spilitekeratophyre volcanic-sedimentary stage.The iron deposits were centralized in the nucleus stratum of the syncline structure,and they were specifically related with the spilite-keratophyre formation,because of their exhalative-sedimentary mineralization mostly happened in the second volcanic-sedimentary-structural evolvement stage.The reconstruction——superposition mineralization for the exhalative-sedimentary deposits obviously occurred in the upper metamorphic-deformational-intrusive process.更多还原