| 黑龙江五星铜镍、铂钯矿床镁铁质杂岩的元素地球化学特征与岩石成因 |
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| 引用本文： | 梁树能,李光辉,孙景贵,陈冬,逄伟,常艳.黑龙江五星铜镍、铂钯矿床镁铁质杂岩的元素地球化学特征与岩石成因[J].世界地质,2009,28(1):28-36. |
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| 作者姓名： | 梁树能 李光辉 孙景贵 陈冬 逄伟 常艳 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春130061; 2. 中国地质大学(北京) 地球科学与资源学院, 北京100083 |
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| 基金项目： | 国家自然科学基金，南京大学内生金属成矿机制国家重点实验室基金 |
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| 摘 要： | 五星超镁铁质- 镁铁质杂岩的元素地球化学特征研究表明, 其原始岩浆为低钛、高镁的拉斑玄武岩浆, 由以CO2 为主的流体交代亏损地幔所形成的弱亏损地幔部分熔融产生, 其残余矿物相主要为石榴石、尖晶石和金红石。岩浆形成与演化经历了3 个阶段: ① 上升的软流圈与岩石圈地幔接触, 热流体作用导致岩石圈地幔发生高度部分熔融, 形成初始硫饱和的次碱性玄武岩; ②初始岩浆上侵, 在下地壳形成岩浆房, 岩浆结晶作用形成以似层状橄榄石、紫苏辉石、普通辉石和磁铁矿等为主的堆晶岩, 在地壳物质的参与下形成残余辉长质岩浆; ③ 岩浆房破裂, 残余岩浆和含有熔体( < 30% ) 的堆晶岩相先后上侵形成五星原始镁铁质杂岩。就铜镍和铂钯矿化而言, 铜镍硫化物形成于岩浆房分离结晶晚期的熔离作用, 而铂钯矿化则主要在成岩期后流体作用阶段形成。
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| 关 键 词： | 镁铁质杂岩 元素地球化学 岩石成因 五星铜镍、铂钯矿床 黑龙江 |
| 收稿时间： | 2008-06-10 |
| 修稿时间： | 2008-12-12 |
Element geochemical characteristics and petrogenesis of mafic complex rocks in the Cu-Ni and Pt-Pd deposit of Wuxing in Heilongjiang |
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| LIANG Shu-neng,LI Guang-hui,SUN Jing-gui,CHEN dong,PANG Wei,CHANG Yan.Element geochemical characteristics and petrogenesis of mafic complex rocks in the Cu-Ni and Pt-Pd deposit of Wuxing in Heilongjiang[J].World Geology,2009,28(1):28-36. |
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| Authors: | LIANG Shu-neng LI Guang-hui SUN Jing-gui CHEN dong PANG Wei CHANG Yan |
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| Institution: | 1. College of Earth Sciences, J ilin University, Changchun 130061, China; 2. School of Earth Sciences and Resources, China University of Geosciences (B eijing) , B eijing 100083, China |
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| Abstract: | Element geochemical characteristics of ultramafic-mafic complex rocks in Wuxing show that the primary magma is tholeiitic magma with low Ti and high Mg in content. It derives from the partial melting function of slightly depleted mantle which forms from metasomatic depleted mantle by CO2 -based fluid, and the main residual mineral phases are of garnet, spinel and rutile. The formation and evolution of magma have experienced three stages: ① thermal fluid led to higher partial melting of lithosphere mantle and then formed hypoalkaline basalt with saturated initial sulfur when ascending asthenosphere contacted with the lithosphere mantle; ② the initial magma intruded into the lower crust to form magma chamber, the crystallization of magma p roduced stratiform-like cumulate, including olivine, hypersthene, augite, magnetite, and then formed residual gabbroic magma with the participance of crustalmaterial; ③ the residual magma and ore-bearing cumulate intruded upward successively to shape originalmafic complex rocks in Wuxing when the magma chamber cracked. According to the mineralization of Cu-Ni and Pt-Pd deposit, Cu-Ni sulphides were formed by liquation in the late phase of fractional crystallization of magma chamber, and the Pt-Pd mineralization mainly occurred on the p rocess of fluid action after diagenetic stage. |
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| Keywords: | mafic complex rocks element geochemistry petrogenesis Wuxing Cu-Ni and Pt-Pd deposit Heilongjiang |
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