胶东煌斑岩的地球化学特征及成因探讨
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国家自然科学基金!资助项目 (490 0 0 0 2 0 )


Geochemical Characteristics and Genesis of the Lamprophyres in the Jiaodong Gold Ore District, Shandong Province
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    摘要:

    胶东金矿区煌斑岩脉广泛发育,这些煌斑岩具有高碱富钾、较高的铝含量、Mg^#值较大等特征,岩性相当于玄武质-玄武安山质的岩石组合。煌斑岩的Cr与Ni、K与Rb、Sr与Ba呈现正相关性,其比值接近华北地块上地壳的值;煌斑岩全岩的δ^18O值和^87Sr/^86Sr值也较高,εNd(t)则呈较大的负值,表明煌斑岩的成岩物质来源与地壳有关。胶东群的两阶段部分熔融模式可以较好地解释这类煌斑岩的成因机制。

    Abstract:

    The Jiaodong gold ore district is one of the most important gold districts in China, and there are many lamprophyre veins in each gold deposit, which mainly spread parallel to gold ore veins. According to the intersections between the gold veins and the lamprophyre veins, the lamprophyres can be divided into three groups, belonging respectively to pre-mineralization period, mineralization period and post-mineralization period, This paper has made a detailed study on petrology, petochmistry, trace element geochemistry and oxygen, neodymium and stron- tium isotopic composition of lamprophyres from four typical gold deposits, namely Qixia,Rushan, Linglong and Jiaojia. The lamprophyres are characterized by high alkali, potassium and aluminium contents and high Mg#values, which are defined as Mg#=100 Mg/(Mg+Fe). The lamprophyres are sim-ilar to basaltic and basaltic_andesitic rocks in petrogenic character. The lamprophyres have high 87Sr/86Sr ratios, lowεNd(t) values, and theirδ18O values are between 6‰and 8‰, higher than those of generally-recognized mantle-derived rocks. There are good positive relationships 43 between Cr and Ni, K and Rb, and Sr and Ba respectively, and the ratios of these elements are close to those of rocks in the upper crust of the North China massif. All of these characteristics show that the source rocks of lamprophyres are related to the crust materials. The two-stage partial melting model of the Jiaodong Group can be used to explain the genetic mechanism of the lamprophyres.

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徐 红,徐光平,2000,胶东煌斑岩的地球化学特征及成因探讨[J].岩石矿物学杂志,19(1):36~44. Xu Hong,2000,Geochemical Characteristics and Genesis of the Lamprophyres in the Jiaodong Gold Ore District, Shandong Province[J]. Acta Petrologica et Mineralogica,19(1):36~44.

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  • 最后修改日期:1999-05-20
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