| 松树沟超镁铁岩岩石化学特征及其成因意义 |
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| 引用本文： | 张泽军,安三元.松树沟超镁铁岩岩石化学特征及其成因意义[J].地球科学与环境学报,1990(2). |
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| 作者姓名： | 张泽军 安三元 |
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| 作者单位： | 西安地质学院地勘系
(张泽军)，西安地质学院地勘系(安三元) |
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| 摘 要： | 通常岩石化学变异有两种趋势:地幔残余(R)趋势表明,地幔源曾遭受了亲岩浆元素的贫化或辉石矿物相的消耗过程;岩浆结晶趋势及其矿物解指示了玄武质(M_1)岩浆和超镁铁质(M_2)岩浆的两种结晶系列。松树沟岩体NiO— Cr_2O_3、MgO—FeO的图解结果表明与上述结论相同。因此,松树沟超镁铁岩亦可区分为地幔残余(R)型和岩浆结晶(M)型等两种成因类型,属复合成因岩体。
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| 关 键 词： | 北秦岭 超镁铁岩 岩石化学 复合成因 |
THE CHEMICAL FEATURES OF THE SONGSHUGOU ULTRAMAFITE ROCKS AND THEIR GENETIC SIGNIFICANCE |
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| Zhang Zejun An Sanyuan.THE CHEMICAL FEATURES OF THE SONGSHUGOU ULTRAMAFITE ROCKS AND THEIR GENETIC SIGNIFICANCE[J].Journal of Earth Sciences and Environment,1990(2). |
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| Authors: | Zhang Zejun An Sanyuan |
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| Institution: | Xi' an College of Geology |
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| Abstract: | Through researching it is shown that some chemical systems or the variation trends of the Songshugou ultramafite rocks can be identified in the changeable data of the bulk-rock chemistry. The residual ( R ) trend has the foloowing principle characteristics, higher M/F values; its limited range ( 10 -11 ); the homogeneity of the bulk-rock chemistry and the dilution of the magmaphile elements. It stands for the mantle residue series in the melting pyrolite.The magma'tic ( M ) trend is of the foloowing principle characteristics, the wider M/F range ( 7. 5-11.5 ); the strong linear variations between M/F and some chemical indices ( CA, SAL, Oxides ) , representing the properties and types of the crystallization in the diapiric mantle. The M trend can be defined as the two types of fractional crystallization trends of the basaltic magma and the ultrabasic magma. The above mentioned conclusions are also supported by the relational connection between the NiO-Cr2O3 or MgO-FeO diagram. By contrast of bulk-rock chemistry with the natural and theoretical peridotites, it is proved that the Songshugou's ultramafites are not the initial mantle periodotites. Briefly speaking, the Songshugou's ultramafites can be divided into more than two genetic types, the mantle residue and the magma crystalline rock. The Songshugou's ultramafite body belongs to the Alpine type complex-genetic body. |
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| Keywords: | the north Qinling ultramafite bulk-rock chemistry complex-genesis |
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