【作者】 庞绪成；

【导师】 顾雪祥； 崔仑；

【作者基本信息】 成都理工大学 ， 矿物学、岩石学、矿床学， 2005， 博士

【摘要】 胶东地区是我国金矿资源主要密集区，焦家金矿田是我国最大的金矿田，焦家金矿床是破碎带蚀变岩型金矿(又称“焦家式”金矿)的代表。矿区位于滨太平洋成矿带西部大陆边缘活动带，为太古宙—元古宙花岗岩—绿岩带发育地区，是地壳构造运动、变质作用、岩浆作用和成矿作用多旋回发育地带。 胶东地区的构造岩浆演化与成矿的关系一直是矿床学界研究和争论的重点之一，尤其是与矿床空间位置关系密切的玲珑和郭家岭花岗岩及矿床成因、成矿时代的研究，不同学者从不同的角度对此提出过不同观点。论文以科研课题为依托，在对关键区段重点解剖的基础上，结合地球物理、岩石化学、地球化学、构造演化和成矿作用的研究成果，对本区的构造岩浆演化与成矿的关系作了较系统的科学总结，建立了焦家金矿矿床地球化学勘查模式，预测并确立了焦家金矿深部存在第二成矿富集带盲矿体，并且认为这种规律可扩展到整个焦家金矿田。 玲珑复合岩体的展布受控于相背倾向的NE向断裂带，微量元素环境判别投点于造山花岗岩或同造山花岗岩区域，属于典型的S型花岗岩。众多的同位素年龄数据变化于102Ma-1718Ma，并集中于早、中、晚三个区段，较晚的区段为110～160Ma。综合判断，玲珑复合岩体(超单元)定位于燕山期的岩浆—变质核杂岩。同位素定年研究表明，成矿年龄约124Ma±1Ma(Rb-Sr等时线法)；Pb同位素及稀土元素地球化学研究得出成矿物质来源于前寒武纪变质基底和玲珑花岗岩的判别结果，表明成矿与岩浆—变质核杂岩的定位形成有直接关系。 焦家金矿的断裂蚀变带从外带(片麻状花岗岩)到内带(主断裂面)，有从韧性变形—韧脆性变形—脆性变形—多期脆性变形迭加的变形性质变化，有分布宽度从宽—窄的变化，在时间序列上有从先后(老新)的变化，反映了岩浆—变质核杂岩形成过程中，构造成矿层次由深至浅的变化。 主蚀变带中的1、2号矿脉实际上是分支复合的同一条工业矿体，受主断裂控制，主矿体的特别厚大部位，往往是由3号脉与主矿体复合形成的，可作为生产更多还原

【Abstract】 East Shandong (Jiaodong) is known as a concentrated district for gold resources and the Jiaojia is the biggest gold mine in China. As a typical altered fracture zone type (also referred as "Jiaojia type") gold deposit, the Jiaojia mine is located in the western active margin of the circum-Pacific metallogenic province, where Archean to Proterozoic granites and greenstones are well developed and multi-cycle events of tectonic movement, metamorphism, magmatism and mineralization happened.The tectonomagmatic evolution and its relationship to mineralization in East Shandong have been long debated. Much controversy has been provoked about the genesis of the Linglong and Guojialing granites, their relations to gold deposits, and the timing of gold mineralization. Based on complicated geological, geochemical and geophysical investigations, this dissertation summarized the tectonomagmatic evolution and mineralization of the study area and put forward a geochemical prospecting model for the Jiaojia deposit. It is then predicted that another gold enrichment zone should exist in deep sites of the deposit and that such a law may be applied to the whole Jiaojia gold mine.The Linglong granites are distributed along regional inverse-dipping NE-SW striking tectonic lineaments. On major and trace elements discrimination diagrams for petrogenetic-tectonic settings, the granites plot in orogenic or syn-orogenic field and exhibit characteristics of S-type granites. A large body of isotopic data changes from 102Ma-1718Ma, and concentrates in early Middle and late time-intervals. The late interval is from 110 Ma to 160 Ma. And this fact supports the opinion that the Lionglong core complex formed during the Yanshan epoch. Rb-Sr isotopic dating on fluid inclusions in Au-bearing quartz veins gives an age of 124±1 Ma. Lead isotopes and REE geochemistry indicate that the ore-forming materials were derived from pre-Cambrian metamorphosed basement and the Linglong granites. And all the above supports that the metallogenesis is directly related to the formation of Linglong core complex.From genissic granite inward to the major fault plane, the altered fault zone in the Jiaojia deposit varies from ductile deformation, through ductile-brittle deformation, to brittle deformation with decreasing thickness of the sub-zones. The inner sub-zones formed relatively later and seem to occur at a shallower depth than the outer更多还原