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| 河南周庵铂族-铜镍矿床的稀土和铂族元素地球化学特征: 热液成矿的证据 | |
| 引用本文： | 糜梅, 陈衍景, 孙亚莉, 王焰, 江合中. 河南周庵铂族-铜镍矿床的稀土和铂族元素地球化学特征: 热液成矿的证据[J]. 岩石学报, 2009, 25(11): 2769-2775. |
| 作者姓名： | 糜梅 陈衍景 孙亚莉 王焰 江合中 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,成矿动力学重点实验室,广州,510640 2. 中国科学院广州地球化学研究所,成矿动力学重点实验室,广州,510640;北京大学造山带与地壳演化实验室,北京,100871 3. 河南地质调查院,郑州,450052 |
| 基金项目： | 国家973项目，中国科学院百人计划项目的资助 |
| 摘 要： | 河南周庵超基性岩体蕴含大型Ni-Cu-(PGE)硫化物矿床,矿化带位于超基性岩体边缘与围岩的接触带.周庵超基性岩体轻稀土富集,其La/Sm_N比值为1.3～4.7,Sm/Yb_N比值为1.9～4.4,显示一定程度的LREE/HREE分异.原始地幔标准化的微量元素配分型显示弱的负Nb异常.岩体的M含量为70×10~(-60～2120×10~(-6),Cu含量为15×10~(-6)～1056×10~(-6);矿石的Ni含量为2592×10~(-6)～6549×10~(-6),Cu含量为1147×10~(-6)～3239×10`(-6).矿石的Ni/Cu比值(2.0～2.3)低于岩石样品(5-83).强蚀变矿化样品的PGE元素含量高于弱蚀变样品约一个数量级,所有样品的Pd/Ir和Pt/Ir比值高,Pd/Ir=1.4～21,Pt/Ir=2.4～22,表明PPGE相对IPGE富集.上述特征显示周庵岩体是构造侵位的地幔岩,岩体与围岩发生了较强烈的物质交换,含水流体交代作用导致了岩体-围岩物质交换和岩体边缘矿化. |
| 关 键 词： | 周庵铂族-铜镍矿床 地幔橄榄岩 稀土元素 铂族元素 流体交代 |
Rare earth element and platinum-group element geochemistry of the Zhou'an Ni-Cu-PGE deposit in Henan province: Implications for hydrothermal origin |
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| MI Mei,CHEN YanJing,SUN YaLi,WANG Yan,JIANG HeZhong. Rare earth element and platinum-group element geochemistry of the Zhou'an Ni-Cu-PGE deposit in Henan province: Implications for hydrothermal origin[J]. Acta Petrologica Sinica, 2009, 25(11): 2769-2775 | |
| Authors: | MI Mei CHEN YanJing SUN YaLi WANG Yan JIANG HeZhong |
| Abstract: | The Zhou'an ultramafie intrusion in Henan Province is mainly composed of peridotite and hosts a large Ni-Cu-PGE deposit.The mineralization occurs in the rim of the lense-like intrusive body.Rare earth elements of the ultramafie rocks are characterized by enriched LREE with La/Sm_N = 1.3～4.7 and fractionated LREE and HREE with Sm/Yb_N = 1.9～4.4.Primitive mantle-normalized trace element patterns decline to right,with weakly negative Nb-anomaly.Ni and Cu contents of the host peridotites range from 70 to 2120×10~(-6) and from 15 to 1056×0~(-6),respeetivly,whereas Ni and Cu contents of ores range from 2592 to 6549×10~(-6) and from 1147 to 3239×10~(-6),respectively.The Ni/Cu ratios of ores are between 2.0 and 2.3,which are lower than those in sulfide-barren rocks(5 to 83).The concentrations of PGEs are highly variable in the ores with Pd/Ir ratios ranging from 1.4 to 21 and Pt/Ir ratios from 2.4 to 22.We propose that the Zhou'an uhramafic intrusion is a structurally emplaced segment of lithospheric mantle,and mineralization around the rim of the intrusion can be attributed to hydrothermal alteration. |
| Keywords: | Zhou'an PGE-Cu-Ni deposit Mantle peridotite Rare earth element(REE) Platinum group element(PGE) Fluid metasomatism |
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