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本文根据不同方法(包括u-Th—Pb法、Rb-sr法、K-Ar法)所测定的同位素年龄值,并结合区域地质背景,认为福建沿海地区除片麻状斜长花岗岩(100～110Ma)属燕山早期外,其余绝大多数岩体皆属燕山晚期不同序次产物。从各岩体铷-锶含量及锶同位素初始值的变化情况的分析,各次侵入岩可能均来自同一深源岩浆,在其向上侵入过程中,加入了壳层的硅铝物质,相应带入了较多的铷,从而改变了原有锶同位素组成成分。
Based on the isotopic age values determined by different methods (including u-Th-Pb method, Rb-sr method and K-Ar method) and combined with the regional geological background, it is considered that in addition to gneissic plagiogranite (100 ~ 110Ma) belongs to the early Yanshanian period. Most of the other rock masses belong to different sequence products of late Yanshan period. From the analysis of the change of rubidium-strontium content and the initial value of strontium isotope in each rock mass, all the intrusive rocks may come from the same deep-source magma. During the up-intrusion process, the siliceous-aluminum material of the shell layer is added and the corresponding More rubidium, thus changing the original composition of strontium isotopes.