胶东磁山花岗岩体的锆石形态群特征及其意义
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Characteristics and Significance of Zircon Topology of Cishan Granite in Jiaodong
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    摘要:

    首次根据烟台地区磁山黑云母二长花岗岩的439粒锆石形态群的研究,确定磁山岩体为岩浆成因。通过与胶东玲珑,郭家岭,昆嵛山三大含金岩体的锆石形态群进行对比,表明磁山岩体与玲珑岩体相似,推测磁山岩体形成时代为晚侏罗世,岩浆物质来源为胶东群部分重熔,物质组成以壳源为主,岩体结晶温度跨度大,富含水分,对成矿有利。

    Abstract:

    The authors studied 439 zircon grains collected from Cishan biotite monzonite granite and found that most zircon grains keep perfect crystal forms, and that there exist corroded zircon crystals. Based on such evidence, the authors believe that Cishan granite is of magmatic origin.93 By comparing characteristics of zircon groups from three main types of gold_hosting granite, namely Linglong granite, Guojialing granodiorite, Kunyushan granite, the authors have also drawn the conclusion that, Cishan and Linglong granites are similar to each other in evolution. It is considered that, as Linglong granite was formed in Late Jurassic, Cishan granite must have also intruded in Late Jurassic. The TET curve of zircon from Cishan granite starts from metamorphic rock and migmatite region, and the low_temperature part is located in the crust origin region, suggesting that partial remelting of Jiaodong group led to the formation of Cishan granite. The crystallization temperature of zircon spanned a wide range from 800℃to 600℃, which implies the richness of water and the favorable condition for mineralization of Cishan granite. Nevertheless, due to its high emplacement position and weak oxidizing capacity, its mineralizing capability is lower than that of Linglong granite.

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孟繁聪,孙岱生,李胜荣,等, 1999. 胶东磁山花岗岩体的锆石形态群特征及其意义[J]. 岩石矿物学杂志, 18(1):87~94.
Meng Fancong Sun Daisheng Li Shengrong Ying Jifeng, 1999. Characteristics and Significance of Zircon Topology of Cishan Granite in Jiaodong[J]. Acta Petrologica et Mineralogica, 18(1): 87~94.

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