北祁连山东段银硐粱早古生代高镁埃达克岩:地球动力学及成矿意义
Early Paleozoic high-Mg adakite from Yindongliang in the eastern section of the North Qilian: Implications for geodynamics and Cu-Au mineralization
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摘要: 银硐粱早古生代花岗闪长岩分布在北祁连造山带东段屈吴山地区,侵入于原阴沟群和前寒武纪变质岩系中.它与米家山、扁强沟、清凹山以及南华山花岗岩类共同构成长约220千米的构造-花岗岩带,沿NW-NWW向展布.地球化学研究结果表明,银硐粱花岗闪长岩具有典型的高镁埃达克岩的地球化学特征,它们具有富Na贫K,SiO2>56%,Al2O3>15%,Na2O>4.0%(4.51%~4.92%),K2O(1.96~2.77%),Na2O/K2 O=1.63~2.40,属钙碱性侵入岩;高Sr(599~691×10-6),低Y(6.3~8.1×10-6),Sr/Y>40(81~94),Y/Yb>10(Yb<1.9×10-6),La/Yb>20(22~45)以及相对于典型的埃达克岩,具有更高的Mg#(58~64,平均59)和相容元素Ni(31~38×10-6)和Cr(35~43×10-6)含量;富集轻稀土元素(LREE),亏损重稀土元素(HREE),(La/Yb)N>10(16~32),轻微负Eu异常(Eu/Eu·平均为0.94),∑REE(85~112)×10-6;微量元素蛛网图显示,岩石富集大离子亲石元素(Rb、Ba、Sr),Nb-Ta和Ti负异常,相对于Ce和Nd,Sr为正异常.由于银硐粱高镁埃达克岩是俯冲洋壳部分熔融的产物,因此,它的存在表明,老虎山弧后洋盆在早古生代早期发生了向北的俯冲作用.银硐粱Cu-Au成矿作用与高镁埃达克岩关系密切,表明在北祁连构造带东段寻找与埃达克岩有关的Cu-Au矿床是一个新的找矿思路.
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Key words:
- Yindongliang /
- High-Mg adakite /
- Geodynamics /
- Copper-gold mineralization /
- Early Paleozoic /
- North Qilian Mountains
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