| 从上地幔相关的交代钛氧化物矿物研究看中国及南非金伯利岩地球化学性质的相似性 |
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| 引用本文： | 周湖云,陆琦,雷新荣,刘惠芳.从上地幔相关的交代钛氧化物矿物研究看中国及南非金伯利岩地球化学性质的相似性[J].地球科学,1996(5). |
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| 作者姓名： | 周湖云 陆琦 雷新荣 刘惠芳 |
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| 作者单位： | Test Center of Minerals and Rocks，China University of Geosciences，Wuhan 430074 |
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| 基金项目： | 地质矿产部壳幔体系、物质交换及动力学开放研究实验室基金 |
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| 摘 要： | 通过对山东蒙阴金伯利岩中富含硅酸盐不相容元素的锶钛铁矿族（ＬＩＭＡ系列）、磁铁铅矿族（ＨＡＹＩ系列）矿物及其相关的钛氧化物矿物的探针成分分析，对比南非Ｄｅｂｅｅｒｓ，Ｊａｇｅｒｓｆｏｎｔｅｉｎ及Ｂｕｌｔｆｏｎｔｅｉｎ等地金伯利岩区的相似矿物研究，发现这类矿物的产出、相互关系及化学成分非常相近，与共生的金云母、碱性闪石等含水矿物一起，反映了富Ｋ，Ｂａ，Ｔｉ，Ｚｒ，Ｎｂ，ＲＥＥ等不相容元素的流体对先前亏损的方辉橄榄岩的交代作用．ＬＩ－ＭＡ，ＨＡＹＩ系列矿物是流体对镁钛铁矿、铬尖晶石等的继承交代产物．不相容元素的局部富集还可形成一些罕见的矿物相，如ＲＥＥ－Ｔｉ及Ｚｒ－Ｔｉ氧化物．与之相关的呈海绵边或基质、空洞充填产出的钙钛矿、富锰钛铁矿、富锰锌尖晶石、柱红石、铬阿玛科矿等，则与碳酸盐化及金伯利岩岩浆晚期不相容元素的浓聚有关．对这类矿物化学成分及相互关系的研究，不但从微观角度揭示了不相容元素在部分上地幔岩石中的富集，提供了卷入交代流体的总成分目录，而且表明南非和山东金伯利岩地球化学性质的相似性
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| 关 键 词： | 钛氧化物矿物，上地幔，交代作用，金伯利岩，硅酸盐不相容元素，山东，南非 |
GEOCHEMICAL SIMILARITY OF KIMBERLITE BETWEEN CHINA AND SOUTH AFRICA FROM THE VIEW OF Ti-OXIDE MINERALS OF UPPER MANTLE |
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| Zhou Huyun,Lu Qi,Lei Xinrong,Liu Huifang.GEOCHEMICAL SIMILARITY OF KIMBERLITE BETWEEN CHINA AND SOUTH AFRICA FROM THE VIEW OF Ti-OXIDE MINERALS OF UPPER MANTLE[J].Earth Science-Journal of China University of Geosciences,1996(5). |
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| Authors: | Zhou Huyun Lu Qi Lei Xinrong Liu Huifang |
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| Abstract: | Through the composition analyses of crichtonite (LIMA) and magnetoplumbite (HAYI) series minerals and their related Ti-oxide minerals,and the comparison with the same research of those in Bebeers,Jagersfontein and Bultfontein in the Kimberley district of South Africa,it is found that this kind of minerals yielded from Shandong,China,are surprisingly similar to those from South Africa,in their occurrence,interrelation and chemical compositions.Their coexistence with the water-bearing minerals,phlogolite and alkali-amphiboles reflects the metasomatism of the previously depleted harzburgites with the fluids enriched in silicate-incompatible elements,K,Ba,Ti,Zr,Nb,REE,etc.LIMA,HAYI series minerals is the result of chromite and Mg-ilmente metasomatosis with the fluids.The local enrichment of incompatible elements also yields such rare minerals,as REE-Ti and Zr-Ti oxide minerals.The related minerals,perovskite,Mn-ilmente,Mn-Zn-spinel,priderite and Cr-armalcolite,usually occurring in sponge and hole of minerals or as groundmass,were estimated in association with carbonation or the enrichment of the incompatible elements in late kimberlitic melt.The further studies on the micro-region chemical compositions and mineral-assemblage of those rare and complex Ti oxide minerals have not only revealed in the microscale enrichment of incompatible elements in the rocks derived from mantle,and presented the total inventory of introduced metasomatic elements of the fluids involved,but also made clear the similarity in geochemical properties between South Africa and Shandong kimberlite. |
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| Keywords: | Ti-oxide mineral upper mantle metasomatism kimberlite incompatible silicate elements Shandong Province South Africa |
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