江苏省燕山期岩浆侵入活动极为频繁与强烈,岩体遍布全区,规模较大者达数百平方公里,小者只及数十平方米。其中由多阶段侵入作用所构成的几个复式岩体——利国复式岩体、宁镇复式岩体、苏州复式岩体(图1),为省内发育之最,分布面积占全省侵入岩体的50％以上。在这些复式岩体中,不同侵入阶段的岩类间,在成因上彼此是有联系的。它们在岩性岩相上虽然往往有明显的差异,但在主要造岩矿物、岩石化学以至矿化等方面 The Yanshanian magmatic intrusion in Jiangsu Province is extremely frequent and intense with rock mass spreading over the whole area. The larger one reaches hundreds of square kilometers, with the smaller one only having tens of square meters. Among them, the multistage intrusions formed by multistage intrusions - the Lioguo complex rock mass, the Ningzhen complex rock mass and the Suzhou complex rock mass (Fig. 1), are the most developed in the province with the total area of ​​the province invaded More than 50% of the rock mass. In these complex rock masses, the interbedded rock masses are genetically related to each other. Although they often have obvious differences in lithology and lithofacies, they are mainly distributed in major rock-forming minerals, petrochemistry and mineralization