相山火山盆地打鼓顶期火山机构初探

Study on the Volcanic Edifice of the Daguding Cycle in the Xiangshan Volcanic Basin

江西相山火山盆地燕山期中期火山活频繁,按岩浆活动序次可分为打鼓顶期和鹅湖岭期2个旋回。早期岩浆活动形成的打鼓顶组火山岩主要出露于盆地的西北缘,由于受晚期岩浆活动破坏、火山岩的覆盖,打鼓顶期的火山活动特征、火山机构的分布至今没有统一认识。在遥感解译的基础上,通过野外地质调查、打鼓顶组熔岩分布与产状调查和火山碎屑岩分布与角砾的统计,并结合已有钻孔资料分析等,推测打鼓顶期古火山口、火山通道等火山机构的分布,进而分析其喷发模式,为相山火山盆地演化研究提供素材。

There had been a great active volcano in mid-yanshan cycle in Xiangshan, Jiangxi Province. The action of volcano has been divided into two cycles, namely Daguding and Ehuling basis on the time and feather of magmatic activities. The volcano rock of Daguding formation formed in the early cycle of volcano action mainly crop out in the northwestern margin of the basin. The feature of the volcano active and distribution of the volcanic edifice of the Daguding cycle have not had an unified understanding by far because it had been damaged by late lava activate and covered by the upper volcano rock of Ehuling formation. Based on the interpretation of remote sensing and analysis of existing drilling data, the distribution of ancient crater and volcanic channels of the volcanic edifice of the Daguding cycle and the eruption pattern of volcanic have been proposed in the paper through surveying on the lava distribution and occurrence of Daguding formation and statistics the distribution of volcano clastic rocks and brecciate. This study provides materials for the research on the evolution of Xiangshan volcanic basin.