【摘要】 在1∶25万琼海县幅区域地质调查中,对海南岛北部地区出露的一套早、中更新世形成的基性火山岩进行了详细研究,新创建多文组,并进一步划分为上、下段,分别代表早更新世晚期—中更新世早期、中更新世中晚期形成的基性火山熔岩、火山碎屑岩。其层位比道堂组、石山组低,且岩性组合存在差异。对该组的分布范围、岩性、岩相、形成时代、地球化学特征进行了总结,并讨论了其形成的构造环境。更多还原

【Abstract】 During the 1:250000 geological survey of the Qionghai County Sheet, a suite of early-mid basic volcanic rocks exposed on northern Hainan Island was studied intensively and the Duowen Formation was established. This formation is divided into the upper and lower members, which represent basic lavas and pyroclastic rocks formed from the late part of the early Pleistocene to the early part of the middle Pleistocene and in the mid-late part of the middle Pleistocene. It is distinguished from the Daotang and Shishan formations by its lower stratigraphic position and lithologic association. This paper summarizes the distribution, lithology, lithofacies, age and geochemistry of the formation and discusses its tectonic environment.更多还原