| 东昆北成矿带冰沟南铜镍矿辉长岩地球化学特征 |
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| 引用本文： | 闫佳铭,孙丰月,陈广俊,钱烨,李良,王超,何书跃.东昆北成矿带冰沟南铜镍矿辉长岩地球化学特征[J].世界地质,2016,35(3):729-737. |
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| 作者姓名： | 闫佳铭 孙丰月 陈广俊 钱烨 李良 王超 何书跃 |
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| 作者单位： | 1. 吉林大学 地球科学学院，长春 130061; 2. 青海省第三地质矿产勘查院，西宁 810008 |
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| 摘 要： | 通过对东昆北成矿带冰沟南铜镍矿辉长岩的全岩地球化学进行分析,以确定该岩体的岩石成因及其形成的构造环境。冰沟南辉长岩SiO_2的含量为49.72%~51.58%,岩石系列为钙碱性。稀土元素球粒陨石分配模式为轻稀土略富集型,δEu为1.26~1.54,轻微正Eu异常。岩石富集大离子亲石元素(LILE)Rb、Ba、K,相对亏损P。岩体中的La/Sm、Th/La和Nb/U比值显示在就位过程中经历了一定程度的地壳混染。研究认为,岩体的岩浆源区为亏损地幔。结合区域演化,认为岩体形成于碰撞后伸展的背景。
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| 关 键 词： | 冰沟南铜镍矿 辉长岩 全岩地球化学 岩浆源区 构造环境 东昆北带 |
Geochemical characteristics of gabbro from Binggounan Cu- - Ni deposit in the north of eastern Kunlun metallogenic belt |
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| YAN Jia-Ming,SUN Feng-Yue,CHEN Guang-Jun,JIAN Ye,LI Liang,WANG Chao,HE Shu-Yue.Geochemical characteristics of gabbro from Binggounan Cu- - Ni deposit in the north of eastern Kunlun metallogenic belt[J].World Geology,2016,35(3):729-737. |
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| Authors: | YAN Jia-Ming SUN Feng-Yue CHEN Guang-Jun JIAN Ye LI Liang WANG Chao HE Shu-Yue |
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| Institution: | 1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. The Third Institution of Qinghai Geological Mineral Prospecting，Xining 810008，China |
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| Abstract: | In order to determine the petrogenesis and tectonic setting in the north of eastern Kunlun orogenic belt，the authors analyze the whole rock geochemical characteristics of gabbro in the Binggounan copper- nickel de- posit． The SiO 2 content of Binggounan gabbros is 49. 72% to 51. 58% and rock series are of calcium alkali． Chon- drte- normalized REE patterns are LREE- slight rich，δEu are 1. 26 ～ 1. 54 with slight Eu positive anomaly． The gabbros are enriched in large ion lithophile elements (LILE) Rb，Ba，K and relatively depleted in P． The La/ Sm，Th/La and Nb/U values suggest that rock masses have experienced some crustal contamination in the process of emplacement． Studies suggest that the primary magma deprived from a depleted mantle． Combining with regional tectonic evolution，the authors conclude that the gabbro formed in the post- collisional extension setting． |
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| Keywords: | Binggounan copper and nickel deposit gabbro whole rock geochemical characteristics magma source tectonic setting north of eastern Kunlun orogenic belt |
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