浙江中生代酸性火山岩同位素地质年龄研究

浙江上侏罗-下白垩统火山沉积岩系发育良好，分布广泛，约占全省面积的三分之二，前人统称其为“中生界火山沉积岩岩系”。长期以来对于这套厚度巨大岩系的时代、划分与对比看法颇不一致，其中尤以浙东和浙西的对比问题争论较多。近年来，随着地质工     

前寒武摩天岭岩体同位素地质年龄讨论

Six zircon smaples were collected from the Motianling massif. According to the characteristics of zircons, they were divided into three types and that of type Ⅲ were separated for isotopic age determination. Through calculation and graphical analysis of the isotopic data on each zircon sample, true zircon ages were obtained:2860 m.y. for type Ⅰ, 760 m.y. for type Ⅱ and 510-580 m.y. for type Ⅲ, It is evident from geological environments of the Motianling massif, in conjunction with the characteristics of the zircons, that the first type formed earlier than the massif, the second one was contemperary with the massif, thus representing the age of the latter,and the third came into being due to metamorphism to which the massif had been subjected after its formation. From the above facts it is reasonable to believe that the Motianling massif is formed by granitization during the Xuefeng movement fromthe Sibao Group and the Banchi Group in the studied area. Later, it once again suffered metamorphism during the Caledonian movement and thus giving rise to the massif we observed at present.