辽东地区青城子晚三叠世双顶沟—新岭岩体的深部地质特征及三维建模

发布时间：2018-03-06 06:43

本文选题：青城子地区　切入点：双顶沟-新岭岩体　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：时至今日,无论从人类生产发展对矿产资源的迫切需求,还是从科学找矿理论的成熟度、深部地球物理探测方法和对技术的掌握等不同角度来看,我国已然进入了深部地质找矿这一复杂的综合性找矿工作阶段。在这一阶段,地质研究与找矿工作的技术手段已经逐步实现由平面二维向立体三维过渡,而三维的地质体建模就是汇总整合所有深部地质调查资料对其进行立体表达。本文在前人对青城子地区晚三叠世岩浆侵位地球化学角度研究的基础上,选取与该地区铅锌金银多金属成矿密切相关的双顶沟岩体和新岭岩体为研究对象,在详细的野外地质调查基础上,提取重磁异常、电磁测深剖面异常的特征标志,研究异常组合的综合效应,标定侵入岩体地下赋存部分形态及主要分支的延展方向,获得侵入岩体在地表投影的最大赋存范围及深部边界基本轮廓。这些工作有利于总结青城子地区岩浆热液型矿床的深部成矿规律,并取得了以下主要认识和成果:(1)根据重、磁、电的测量及反演结果,结合基础地质信息的约束,可以对岩体隐伏部分的形状和性质进行综合推断与解译。构建了岩体深部形态的格架。(2)晚三叠世双顶沟岩体边界普遍发生外倾现象,临近岩体的辽河群地层之下存在大面积隐伏。新岭岩体深部隐伏部分与双顶沟岩体连通,是作为岩基产出的双顶沟岩体的岩枝部分。(3)青城子地区的铅锌金银矿床具有分布成带的特征,晚三叠世岩浆活动事件为区域成矿提供了有利条件。(4)初步总结了青城子地区的深部成矿规律,对该区的隐伏找矿工作提供参考依据。
[Abstract]:Today, whether from the urgent demand for mineral resources from the development of human production, or from the maturity of scientific prospecting theory, the deep geophysical exploration methods and the mastery of technology, and so on, China has entered the stage of complex comprehensive prospecting of deep geological prospecting, in which the technical means of geological research and prospecting have gradually realized the transition from plane two-dimensional to three-dimensional. The three-dimensional geological body modeling is to collect and integrate all the deep geological survey data to express it. This paper is based on the previous study of the late Triassic magma emplacement geochemistry in Qingchengzi area. The Shuangding gully and Xinling rock bodies, which are closely related to the lead-zinc gold and silver polymetallic mineralization in this area, are selected as the research objects. On the basis of detailed field geological investigation, the characteristics of gravity and magnetic anomalies and electromagnetic sounding profile anomalies are extracted. The synthetic effect of anomalous assemblage is studied, and the shape of underground occurrence and the extension direction of main branches of intrusive rock mass are calibrated. The maximum range of projection of intrusive rock mass on the surface and the basic outline of deep boundary are obtained. These works are beneficial to summing up the rules of deep mineralization of magmatic hydrothermal deposits in Qingchengzi area, and have obtained the following main knowledge and results: 1) according to gravity and magnetism, Electrical measurements and inversion results, combined with the constraints of basic geological information, The shape and properties of the concealed part of the rock mass can be inferred and interpreted synthetically. The framework of the deep form of the rock mass. 2) the boundary of the late Triassic Shuangding ditch rock mass is generally extroverted. Under the strata of Liaohe Group adjacent to the rock mass, there is a large area of invisibility. The deep concealed part of the Xinling rock body is connected with the Shuangding gully rock mass. The lead-zinc gold-silver deposit in Qingchengzi area is characterized by distribution and zonation. The late Triassic magmatic events provide favorable conditions for regional metallogeny. 4) the deep metallogenic regularity of Qingchengzi area is preliminarily summarized, which provides a reference for the concealed prospecting work in this area.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P628;P631

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