江西会昌周田盆地东侧双峰式火山岩及其构造环境

周田盆地东侧．上、下白垩统过渡层位有一套火山岩系，沿石城－寻乌深断裂带分布。通过火山岩层位和火山旅回、火山岩岩石学、火山构造、岩石化学、微量和稀土元素等系统研究，认为下垩统版石组流纹岩属钙碱性系列，上白垩统茅店组玄武岩为碱性系列，由酸性→基性，中间缺失安山岩类过渡岩系，经岩石标准矿物计算得出，两者来自不同深度岩浆源区的大陆裂谷双峰式火山岩系，与该区相应的次火山岩演化一致。

THE BIMODAL VOLCANIC ROCK AND ITS TECTONIC SETTING IN THE EASTERN ZHOUTIAN BASIN IN HUICHANG JIANGXI PROVINCE

In the eastern Zhoutian basin, a suit of volcanic sequence located at the transition bed betWeen the upper Cretaceous and lower Cretaceous develops along the Sllicheng - Xunwu fault. Based on the synthetic analysis of volcanic sequence and volcanic cycle, volcanic petrology, volcanic tectonics, lithochemistry, trace element as well as rare earth element (REE), the authorsconclude that the rhyolite of the lower Cretaceous Banshi formation belongs to calcic - alkalicseries and the basalt of upper Cretaceous Maodian formation is regarded as alkalic series, consisting of acid and basic rocks and lack of andesites. The rock standard mineral calculation reveals that beth originated from continental rift bimodal volcanic sequence in magmatic reservoirsat different depth- The evolution is consistent with that of the corresponding subvolcanic rocksin the region.