黑龙江省嫩江县三矿沟Cu-Fe-Mo矿床岩浆岩成因研究

发布时间：2018-03-03 11:37

  本文选题：三矿沟　切入点：Cu-Fe-Mo矿床　出处：《中国地质》2016年06期 　论文类型：期刊论文

【摘要】：三矿沟Cu-Fe-Mo矿床是大兴安岭地区三矿沟—多宝山构造-成矿带中一个比较典型的矽卡岩型矿床。在大量野外地质调查、室内岩矿鉴定的基础上,对与成矿有关的三矿沟复式英云(花岗)闪长岩体的岩石地球化学特征进行了分析,探讨了该岩体的成因类型和构造环境。研究表明,该矿床岩浆岩体属于钙碱性I型花岗岩,具有大陆地壳的特征,形成于与造山花岗岩有关的火山弧环境或相似的构造环境中,主要与造山阶段的火山弧花岗岩关系密切。稀土元素配分图显示向右缓倾斜的轻稀土元素富集型特点,轻、重稀土分馏较为明显,无明显的负铕异常,暗示其具有相同或相近的成因,也反映了同源岩浆的特点。δEu值介于0.81~1.24,δCe值为1.00~1.13,表明岩浆演化过程中发生了微弱的分离结晶作用,同时又受到同化混染作用的一定影响,其成岩环境氧逸度较低,指示了缺氧环境,有利于金属元素的积聚而形成矿床。
[Abstract]:The Sankuangou Cu-Fe-Mo deposit is a typical skarn type deposit in the Sankuang-Dobaoshan tectonic-metallogenic belt in Daxinganling area. The petrogeochemical characteristics of the Sankuangou compound Yingyun (granodiorite) diorite are analyzed, and the genetic types and tectonic environment of the intrusive body are discussed. The study shows that the magmatic body of the deposit belongs to calc-alkaline I-type granite. Having the characteristics of the continental crust formed in a volcanic arc environment or similar tectonic environment associated with orogenic granites. It is mainly related to volcanic arc granites in orogenic stage. The REE distribution diagram shows that the enrichment type of LREE is slightly inclined to the right, the fractionation of LREE is obvious, and there is no obvious negative europium anomaly. It suggests that it has the same or similar origin, and also reflects the characteristics of the homologous magma. The 未 EU value is between 0.81 and 1.24, and the 未 ce value is 1.001.13, which indicates that the magmatic evolution has a weak separation and crystallization process and is also influenced by assimilation and staining. The oxygen fugacity of diagenetic environment is low, which indicates anoxic environment and is favorable to the accumulation of metal elements.
【作者单位】： 黑龙江省矿业集团有限责任公司;黑龙江省地质调查研究总院齐齐哈尔分院;
【基金】：全国危机矿山找矿项目(200623016)资助~~
【分类号】：P618.2;P588.1
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