苏东北多期A型花岗岩及其成岩构造环境

江苏东北部地区有宋山、牛山和踢球山3种A型花岗岩（类）。其中宋山岩体属A1亚型花岗岩类，形成于晋宁期苏胶造山带同造山的郯庐走滑断裂带的拉张环境；牛山岩体属A2亚型花岗岩，形成于震旦期苏胶造山带碰撞造山后的拉张环境；踢球山岩体属A1－A2过渡亚型花岗岩，形成于燕山期苏胶造山带陆内造山后和郯庐断裂带的拉张环境。

A-type Granite of Multiple-stages and Their Diagenetic Tectonic Environment in Northeast Jiangsu Province

Three kinds of A-type granitoids are occurred in Songshan,Niushan and Tiqiushan of the northeast areas in Jiangsu.In which,Songshan rockmass is deemed to be granite of A 1 subtype,formed in an extensional environment of Sujiao orogenic belt in Jinning stage and the orogenic Tanlu strike-slip fracture belt;Niushan rockmass is deemed to be granite of A 2 subtype,formed in an extensional environment of Sujiao orogenic belt of collision post-orogenesis in Sinian stage;Tiqiushan rockmass is deemed to be granite of A 1-A 2 transitional type,formed in an extensional environment of inter-terrigenous post-orogenesis of Sujiao orogenic belt in Yanshan stage and Tanlu fracture belt.