密坑山岩体是南岭地区与锡成矿密切相关的典型岩体，侵人于上侏罗统鸡笼嶂组流纹质凝灰熔岩及火山碎屑岩中，为一破火山中央岩株侵人体，其主体岩性为钾长花岗岩，Rb-sr全岩等时线年龄为（124.5±0.7）Ma。地球化学方面，该岩体具有富si、偏碱性、富K、Al弱过饱和、Rb／sr及Rb／Ba比值高、Eu负异常显著、富Ga、Ga/Al比值大（4.14～6.77）、富高场强元素（如Nb和zr）等特点。地质地球化学特征及产出构造背景的综合分析表明，该岩体不是典型的s型花岗岩，而应属铝质A型花岗岩。岩体的Nd（t）值偏高（-3.56～-5.13），二阶段Nd模式年龄偏低（1207～l326 Ma），反映成岩过程中有地幔组分的参与，属壳幔混源花岗岩。二元混合模拟计算显示成岩过程中地幔物质的混人比例为53.1％～60.0％，较高含量地幔组分参与成岩过程无疑指示幔源组分对成矿具有重要贡献，这一认识对于进一步揭示南岭地区稀有多金属矿床的成矿机理具有重要意义。

福建承泰云山破火山石帽山群第三旋回顶部的霏细流纹岩舍有霓石、钠铁闪石等碱性铁镁矿物。化学成分富硅、富碱，碱性指数（AKI值）大于0.90，Rb.Th、Nb.Zr.Ga.等元素的含量高，Ga/A]值大，贫钙，镁，铝和过族元素。轻。重稀土比值较小，并具有显著的负铕异常：在K2o-Na2O及以 Ga/Al值为基础的多种判别图上均投影在A型花岗岩区。上述特征与其邻近的魁歧典型碱性花岗岩相似，也可与国外有关典型碱性流纹岩相对比，据此将该层流纹岩厘定为碱性流纹岩。这一流纹岩与魁歧碱性花岗岩均形成于拉张的构造环境。两者的Nd同位素组成十分接近，ENd（r）值分别为-3.62～4.29和-3.45～5.21，显示它们具有相同的岩浆源区，均为壳幔混源岩浆作用的产物。

山东中生代橄榄安粗岩系火山岩主要分布在沂沐断裂带及其两侧的断陷型陆相火山盆地中，为早白垩世火山活动的产物。Rb-sr全岩等时年龄变化于111.4～119-6Ma岩石组合主要为粗面玄武岩一橄榄安粗岩一安粗岩一粗面岩。这套岩石在化学上具有富碱富钾、富铝贫钛，高氧化系数及富轻稀土和太离子亲石元素的特点。并具有较高的Isr值和明显偏低的sNd值、根据对岩石地质，地球化学特征和产出构造环境的详细分析。表明这查岩石的成因应主要是富集型地幔的部分熔融。

Late Cretaceous (90-100Ma) A-type granites are widespread in the coastal area of the Zhejiang and Fujian Provinces, SE China. According to mineralogical and geochemical characteristics, the A-type granites in this belt can be further divided into aluminous and peralkaline subgroups. The aluminous subgroup often contains aluminous-rich minerals (e.g. spessartine and Mn-rich muscovite), while the peralkaline subgroup usually contains riebeckite, arfvedsonite and aegirine. Geochemically, the aluminous A-type granites show lower Nb, Zr, Ga, Y and REE abundances, and lower FeO*/MgO and Ga/Al than the peralkaline subgroup. When they occur in the same area, the two subgroups of A-type granites display quite similar initial Nd isotopic compositions, which are indicative of mixing of ancient basement crustal rocks with variable amounts of mantle materials. Integrated geological and geochemical investigations indicate that both the aluminous and the peralkaline magmas are highly evolved and reflect the residual liquids left after high degrees of fractional crystallisation in a deep magma chamber. The present authors suggest that the mineralogical and geochemical differences between the aluminous and peralkaline subgroups are likely to have been generated via different differentiation paths controlled by varying fluorine contents of the parent magmas.