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黄山东、香山及土墩岩体均为多阶段侵入的杂岩体,岩体与围岩为侵入接触关系,显示热侵位特征。岩石组成单元主要为超镁铁质橄榄岩和镁铁质辉长岩。岩石化学组成以拉斑玄武岩系列为主,存在部分钙碱性系列和碱性系列。稀土元素具平坦的分配型式或轻稀土略富集的分配型式。锆石Hf同位素指示岩石来源于亏损型地幔源区。黄山东、香山及土墩镁铁-超镁铁岩不是俯冲洋壳的残余或者岛弧环境的阿拉斯加型岩体,而是来源于亏损型地幔源区的岩浆底侵形成。
Huangshan, Xiangshan and mound rock mass are multi-stage intrusion of complex rock mass, rock and rock intrusion relationship, showing the characteristics of thermal emplacement. The main components of the rocks are ultramafic peridotites and mafic gabbro. Rock chemical composition to tholei basalt series, there are some alkaline series and alkaline series. Rare earth elements with a flat distribution pattern or slightly enriched distribution pattern of light rare earths. Zircon Hf isotopes indicate that the rocks originated from the depleted mantle source. The mafic-ultramafic rocks of Huangshan, Fragrant Hills and mounds are not the Alaskan-type intrusions of the subducted oceanic crust or island arc environment but rather the magmatic underplating originating from depleted mantle source areas.