论文部分内容阅读
夏日多岩体位于玉龙斑岩矿带北端,岩石地球化学特征与矿带含矿斑岩相一致。该区岩浆岩主要有黑云母二长花岗斑岩、石英闪长玢岩和花岗闪长岩,斑岩体内发育暗色包体。夏日多岩体具高CaO,K_2O,MgO含量和低CaO,TFeO含量的特点,属钾玄岩系列岩石;稀土元素总量较低,轻稀土元素富集明显,无或弱的Eu和Ce元素异常;岩体富集LILE,具有高Rb/Sr,Zr/Hf比值和低Ti/Eu,Ba/Rb比值的特点。成岩物质来源于地幔岩石圈,由交代成因的金云母岩脉发生低程度熔融,并受到来自俯冲洋壳的硅酸盐-碳酸盐流体的交代作用和熔体混染作用的影响,形成于陆-陆主碰撞之后的相对滑动阶段,沿夏日多背斜核部上升侵位。通过对比研究,该区具形成斑岩型铜(钼)矿床和矽卡岩型铅锌矿床的巨大潜力。
The summer pluton is located at the northern end of the Yulong porphyry belt. The geochemical characteristics of the rock are consistent with the ore-bearing porphyries. The magmatic rocks in the area are mainly biotite monzogranite porphyry, quartz diorite porphyrite and granodiorite, and dark porphyrite is developed in porphyry. The summer pluton has the characteristics of high CaO, K2O, MgO content and low CaO, TFeO content, which belongs to the series of potash-basalt rocks; the total amount of rare earth elements is lower, the light rare earth elements are enriched obviously and the Eu and Ce Elemental anomaly. The rock mass is enriched in LILE and has the characteristics of high Rb / Sr, Zr / Hf ratio and low Ti / Eu, Ba / Rb ratio. Diagenetic material is derived from the mantle lithosphere and is formed by the low degree of melting of phlogopite veins of metasomatic origin and by the metasomatism and melt-mixing of silicate-carbonate fluids from the subducted oceanic crust During the relative slip phase after the land-land collision, the emplacement increased along the summer multi-anticlinal core. Through comparative studies, the area has the great potential of forming a porphyry copper (molybdenum) deposit and a skarn type lead-zinc deposit.