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扬子陆块与华北陆块碰撞 ,华北陆块南缘带转化为活动陆缘。徐州—宿州弧形构造带中的班井杂岩体侵位于造山后的早侏罗世。石英二长闪长岩中角闪石的w (4 0 Ar) /w (3 9Ar)坪年龄为(191.3± 0 .5 )Ma。岩体主要由钙碱性闪长质岩组成 ,具有钙碱性安山岩的地球化学特点 ,伴有少量碱性辉长岩。岩浆来源于拉斑玄武质下地壳源岩在拉伸构造环境下的部分熔融。华北陆块南缘同时代的以班井区钙碱性岩体为代表和以鲁西隆起的铜石区高钾质岩体为代表及伴随的金矿化 ,构成了成对的岩浆 -金矿化带。
The Yangtze block collided with the North China continent, and the southern margin of the North China block transformed into an active continental margin. The wellbore complex in the Xuzhou-Suzhou arcuate tectonic belt was located in the Early Jurassic after orogenic. The w (4 0 Ar) / w (3 9Ar) Ping ages of hornblende from quartz monzonite are (191.3 ± 0.5) Ma. The rock mass is mainly composed of calc-alkaline dioritic rocks with the geochemical characteristics of calc-alkaline andesite accompanied by a small amount of alkaline gabbro. The magma is derived from the partial melting of the source rock of the basalt Lower Thorns in the tensile tectonic setting. The southern margin of the North China block represented by the calc-alkaline rocks in the Banjing area and the high-kappa rocks in the Luoshi uplift and accompanying gold mineralization constitute the paired magma-gold Mineralization belt.