| 甘肃北山大山头铜镍矿化基性-超基性岩成矿潜力研究 |
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| 引用本文： | 王小红,杨建国,王磊,谢燮.甘肃北山大山头铜镍矿化基性-超基性岩成矿潜力研究[J].高校地质学报,2014,20(2):222. |
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| 作者姓名： | 王小红 杨建国 王磊 谢燮 |
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| 作者单位： | 西安地质矿产研究所;国土资源部岩浆作用成矿与找矿重要实验室; |
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| 基金项目： | 中国地质调查局甘肃北山狼山—罗雅楚山地区铁镍多金属矿调查项目 |
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| 摘 要： | 为了研究甘肃北山大山头含铜镍硫化物基性、超基性岩的成矿潜力,通过野外调查和室内综合对比研究,取得如下 认识及成果:(1)大山头岩体侵位于前寒武系中深变质碎屑岩与片麻状花岗岩中,为多期次侵位的杂岩体,早期以中细粒辉 长岩岩基为主,晚期为橄榄苏长辉长岩-二辉橄榄岩相基性-超基性岩,岩体分异明显,橄榄二辉岩全岩铜镍矿化(Cu 含量 0.08%~0.46%,Ni 含量 0.2%~0.37% ):(2)岩体常量和微量元素具岛弧基性超基性岩浆特征(例如岩体亏损高场强元素 Nb, Ta,Ti,Hf 及 Y 和 P,富集大离子亲石元素 Ba,Rb,Th,U,K 及 La 等);(3)磁法异常与岩体地表矿化一致,电法结果显示 岩体深部矿化更好(最大磁场强度值 600nT,视极化率(ηs)显示最大值可达 7.5%~12.1%);(4)岩体岩石地球化学特征与金川、 喀拉通克、红旗岭等相似,与甘肃黑山一致。因此,大山头有望成为储量规模不亚于甘肃黑山的铜镍硫化物矿床。
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| 关 键 词： | 铜镍硫化物 基性-超基性岩 北山 甘肃 |
Metallogenic Potential of Copper and Nickel Mineralization in the Mafic-Ultramafic Rocks in Dashantou,Beishan, Gansu Province |
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| WANG Xiaohong,YANG Jianguo,WANG Lei,XIE Xie.Metallogenic Potential of Copper and Nickel Mineralization in the Mafic-Ultramafic Rocks in Dashantou,Beishan, Gansu Province[J].Geological Journal of China Universities,2014,20(2):222. |
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| Authors: | WANG Xiaohong YANG Jianguo WANG Lei XIE Xie |
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| Abstract: | In order to study the ore-forming potential of mafic-ultramafic rocks with Cu-Ni sulfide in Dashantou, Beishan,Gansu Province, we have conducted the field investigation and comprehensive comparison, and made the following achievements : (1) the Dashantou rock was emplaced in Precambrian middle-deep metamorphic clastic rocks and gneissic granite, and is characterized by many episodes of magmatism. Early stage was dominated by the fine-grained gabbro rock foundation and the olivine, gabbro-two pyroxene peridotite mafic ultramafic rocks become dominant in later period. Rocks were differentiated obviously, and the Cu-Ni mineralization of lherzolite completely (Cu content 0.08%-0.46%, Ni content 0.2%-0.37%); (2) The major and trace elements have the characteristics of arc ultramafic basic magma (such as lack of high field intensity elements Nb, Ta, Ti, Hf , Y and P, enrichment of large ion lithophile elements Ba, Rb, Th, U, K and La); (3) Magnetic anomaly and rock surface mineralization are uniform. The results of electric conductivity show that the mineralization in deep rock is better.(the maximum value of the magnetic field strength 600nT, apparent polarizability (ηs) shows a maximum value of 7.5%-12.1% ); (4) the geochemical characteristics are similar to those of Jinchuan, Kalatongke, Hongqiling deposit, and the Heishan deposit in Gansu Provice. Therefore, Dashantou is expected to become the Cu-Ni sulfide deposit with reserve scale not less than that of the Heishan deposit. |
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| Keywords: | copper and nickel sulfide basic ultrabasic rock Beishan Gansu Province |
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