胶西北焦家式金矿控矿构造蚀变带的地球化学标志

发布时间：2018-07-13 07:31

【摘要】：胶西北地区金矿在我国黄金勘查及生产中占据重要地位,找矿潜力巨大。解决该地区深部及外围地质找矿问题的有效途径之一,是提出新的定量化找矿标志。以焦家式金矿为例,根据钻孔岩石测量结果,认为该矿床是在初始矿源岩基础上叠加了中生代构造热液的复成构造蚀变岩型矿床,并对矿床的地球化学标志进行了剖析和总结。结果显示,焦家式金矿的形成受初始矿源岩的基础性控制,矿源岩以富Au且显著富S为特征。在初始矿源岩基础上,构造蚀变带地段发生后期热液活动,导致矿源岩中元素重新活化迁移,典型地球化学标志是Na_2O等元素发生贫化,形成负异常。总之,Au、S等元素富集形成的正异常是初始矿源岩的地球化学标志,而Na_2O等元素贫化形成的负异常是控矿构造蚀变带的地球化学标志。
[Abstract]:Gold deposits play an important role in the exploration and production of gold in Jiaobei area, and the prospecting potential is great. One of the effective ways to solve the problem of deep and peripheral geological prospecting in this area is to propose a new quantitative prospecting marker. Taking Jiaojia-type gold deposit as an example, according to the results of rock survey from boreholes, it is considered that the deposit is a metamorphic ore deposit with Mesozoic tectonic hydrothermal superposition on the basis of the initial source rock, and the geochemical markers of the deposit are analyzed and summarized. The results show that the formation of Jiaojia-type gold deposit is controlled by the foundation of the initial source rock, which is characterized by au enrichment and significant S enrichment. On the basis of the initial source rocks, the late hydrothermal activity occurred in the tectonic alteration zone, which led to the reactivation and migration of elements in the source rocks. The typical geochemical marker is the depletion of elements such as Na2O and the formation of negative anomalies. In a word, the positive anomaly formed by the enrichment of elements such as Au-S is the geochemical marker of the initial source rock, while the negative anomaly formed by the depletion of elements such as Naal _ 2O is the geochemical marker of the ore-controlling structural alteration zone.
【作者单位】：中国地质科学院地球物理地球化学勘查研究所;中国地质科学院;山东省第六地质矿产勘查院;
【基金】：国家科技支撑计划项目(2014BAB05B00)
【分类号】：P618.51

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