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玲珑金矿田控矿构造特征与深部预测研究
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摘要
玲珑金矿田是我国著名的黄金生产基地,矿田内大面积出露玲珑型花岗岩,局部被第四系沉积物所覆盖。断裂构造是主要的控矿要素。矿体可分为蚀变岩型矿体和含金石英脉矿体两种类型,两者的形成和分布都严格的受断裂构造控制。
     本论文在总结前人工作成果的基础上,通过深入细致的野外地质调查,采集大量的岩石标本,利用岩石学、构造地质学、区域成矿学及成矿预测学等理论和方法,同时结合计算机数据处理、绘图等手段,从区域地质背景研究入手,着重研究了矿田内控矿构造特征以及成矿深度。从宏观上和微观上分析了矿区控矿构造的特征。通过对成矿深度的研究,结合构造变形岩相形迹大比例尺填图,总结了成矿规律,开展了深部预测研究。
     通过研究认为: 1)玲珑金矿田主要的控矿构造为断裂构造,根据断裂构造规模可化分为Ⅰ、Ⅱ、Ⅲ级控矿断裂。Ⅰ级控矿断裂控制着矿床的分布。Ⅱ级控矿断裂构造控制了主要矿体的分布。Ⅲ级控矿断裂控制了分支矿体的产出。2)矿体类型的分布受断裂构造的性质及空间类型的控制。蚀变岩型矿体主要分布于区域压扭性断裂带下盘一侧,石英脉型金矿体的主要发育在区域压扭性断裂带下盘的一系列低级序张扭性断裂裂隙中。3)通过镜下观测岩石显微构造特征,指出台上金矿以韧性变形为主,玲珑金矿以脆性变形为主。4)采用构造校正的方法来测算成矿深度,得出台上金矿成矿深度为3500米左右,为中浅成矿床。5)通过构造变形岩相形迹大比例尺填图,结合矿山实际资料及前人研究成果,综合分析认为玲珑矿田深部还存在相当可观的资源量。
The Linglong ore-field is the most important gold base in China.The Linglong granite can be found in most areas and the quaternary also can be found in some areas in the ore-field.Faults is the main ore-controlling elements.There are two types of ore,one is altered rock type which another is quartz vein type.Both the formation and distribution are strictly controlled by faults.
     Based on the predecessors’work,through intensive field investigation,collecte large number of rock samples,use the theory of petrology,structural geology,regional metallogeny,metallogenic predictions,combine with the method of computer data processing and drawing,start from the regional geological setting,the writer focou on studying the structrue of ore-controlling and metallogenic depth.Through the research,the author summarizes the metallogenic regularity.
     Following results obtained by studying:1)The main ore-controlling structure is the fault.Faults can be divided into three categories according to their scale.The gradeⅠcontrolling faults controls the distribution of deposits,the gradeⅡcontrols the distribution of the main ore body and the gradeⅢcontrolling faults controls the distribution of branch ore.2)The distribution of ore types controlled by the nature and type of faults.Altered rock-type ore formation in the area under the pressure plate side of the shear fracture zone,while quartz vein type ore formed in tension cracks which under the pressure plate side of the shear fracture zone.3)By microscope observation of rock microstructure characteristics,the author find that the deformation is dominated by ductile deformation in Taishang deposit and brittle deformation in Linglong deposit.4)Use the structure-correction method to measure the depth of mineralization,the author recognize that the Taishang gold deposit is a shallow deposit which mineralization depth is 3,500 meters.5)Through large-scale mapping of structure-deformated-pertrofacies features,combine with the actual data and previous research results,,the author comprehensive analysis that there are considerable amount of resources in Linglong gold deposits.
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