黄山东镁铁超镁铁杂岩中的辉石化学成分研究
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P584

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Chemical Composition of Pyroxenes from the Huangshandong Mafic-Ultramafic Complex in Hami,Xinjiang
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    摘要:

    通过对黄山东镁铁超镁铁杂岩的辉石化学成分研究,证明辉石的化学成分受寄主岩石类型的制约,从超镁铁岩相到角闪辉长岩相斜方辉石的化学成分由富MgO、SiO2、Al2O3、Cr2O3到富FeO、TiO2、CaO、MnO;单斜辉石化学成分由富Al2O3、Cr2O3、Na2O、MgO到富FeO、MnO、CoO。在同一寄主岩石中,单斜辉石比斜方辉石富TiO2、Al2O3、Cr2O3、CaO和Na2O,贫MgO、SiO2、MnO和FeO。根据辉石化学成分特征得出黄山东杂岩形成于岛弧环境,为上地幔石榴二辉檄榄岩部分熔融形成的拉斑玄武岩岩浆结晶分异作用的产物。

    Abstract:

    The present paper deals mainly with chemical composition of pyroxenes which constitute the major rock-forming minerals in the Huangshandong mafic-ultramafic complex.Orthopyroxenes in the Huangshandong complex are exclusively bronzitc, which seems related to host rocks in chemical composition, being rich in "En" in the ultramafic facies and enriched in "Fs" in the hornblende-gabbro facies. Clinopyroxenes vary considerably in chemical composition, covering augite, diopside and enstatite-diopside. In the same host rock, clinopyroxenes contain more TiO2, A1203, Cr203, Ca0 and Na2O but less MgO, FeO, Mn0 and SiO2 than orthopyroxenes.Statistical analysis indicates that from the ultramafic facies to the hornblende-gabbro facies, chemical composition of orthopyroxenes varies from the enrichment of MgO, SiO2 and Al2Os to the enrichment of FeO, TiO2, Ca0 and MnO, whereas that of clinopyroxenes from the richness of A1203, Cr203, Na2O and MgO to the richness of FeO, Mn0 and CoO. There exists linear positive correlation between Fe2+/Mg values of coexisting two pyroxeness; KD values vary in the range of 0.92-3.42, equivalent to KD values of pyroxenes of magmatic origin. Their equilibrium t and P are 947-1157℃ and 0.58-10.58 (0.1 GPa) respectively. Chemical composition of the pyroxenes indicates evidently that their parental magma was tholeiitic magma formed by partial melting of garnet-lherzolite in a plate-tectonic setting of island arc.

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倪志耀,1994,黄山东镁铁超镁铁杂岩中的辉石化学成分研究[J].岩石矿物学杂志,13(1):55~66.

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