【作者】 关键；

【导师】 孙丰月； 郭文秀；

【作者基本信息】 吉林大学 ， 矿物学、岩石学、矿床学， 2005， 博士

【摘要】 通过对吉林东南部地质资料的重新研究,认为其地壳演化经历了早前寒武纪陆壳形成期、晚元古代-古生代古亚洲构造发展期和中生代滨太平洋构造运动叠加期等三个阶段,提出吉南太古宙陆核是由多个地体拼合而成的新观点,并按地体构造划分准则,首次对研究区地体构造进行了划分。在对老岭地区地质构造详细研究的基础上,提出老岭变质核杂岩的新认识,确认了变质核杂岩的结构特征、形成演化过程及其对金成矿的控制作用。指出研究区构造控矿的重要性,提出区内成矿的两个重要时期是古元古代和中生代,将区内矿床重新划分为夹皮沟、鸭绿江、天合兴-二密等三个受深大断裂(韧性剪切带)控制的成矿带,阐明了不同矿种、不同成因类型矿床的空间分带特征。论文首次提出二道甸子、夹皮沟、黑龙江老柞山等金矿床为造山型金矿床的新观点,并得出了由浅成到中深成矿的新认识,从而建立了该区造山型金矿的地壳垂向连续成矿模式。首次提出吉林东部延边地区的刺猬沟金矿和九三沟金矿分别为低硫化型和高硫化型浅成低温热液矿床,并建立了相应的成矿系列。根据硼矿及铜钴矿的形成环境及矿床特征分析,确认高台沟硼矿、大横路铜钴矿为热水沉积-变质变形改造型矿床类型,建立了成矿系统模式。在总结区域成矿模式和大型矿田产出条件的基础上,提出了桦甸溜河地区、和龙穷棒子沟-金城洞-积水沟地区为造山型金矿成矿有利地区,老岭地区亦存在变质核杂岩型金成矿的巨大找矿潜力。更多还原

【Abstract】 The southeast Jilin Province is located in the north margin of North China Plate,which is an important component part in the metallogenetic belt of north margin. There aremany mineral resources of precious and non ferrous metals in the area. Based on regionalmetallogeny and theory of terrane tectonics, we regarded metallogeny as core, regionalstructure-fluid-strata-metallogenic dynamics as lead line, metallogeny of precious and nonferrous metal as target. Combining analysis of typical deposits with analysis of geotectonicsetting and metallogenetic dynamics, associating macroscopical characteristics of ore beltswith microscopical natures of deposits, we determined geologic setting, metallogeny andore-controllign factors in the study area. Then every type of metallogenetic series andmetallogenetic medels were built and law of spatio-temporal distribution of metallogenywere concluded by us. At last, prospecting direction and strategic precinct were proposedalso.According to researching geologic setting of metallogeny, it was shown that theevolution of geotectonic setting went through three stages; they are Precambrian crustformation, late Proterozoic-Paleozoic paleo-Asia structural evolution, and Mesozoiccircum-Pacific superposed structural movement. Then we proposed that Archaeozoicgeologic body in the southeast of Jilin Province was a composite terrane Amalgamated byseveral middle Archaeozoic to late Archaeozoic terranes. It could be divided into twomiddle Archaeozoic terrans, four late Archaeozoic terranes and one early Archaeozoicterrane with the rule of terrane classification. Then we discussed their formation andevolution. It was thought that archaeozoic crust consisted of six individual terranes bygeology and geophysics. We considered that these terranes were amalgamated by “A”typesubduction during the late stage of late Archaeozoic. And the north district of study areawas a many-island ocean in paleo-Asia tectonic domain, and then it collided softly with thepaleo-crust in the south of Jilin Province. The compressure between them sustained toJurassic.The former geologists thought that there was an anticline or thrust structure in Laolingdistrict. We considered that it was a metamorphic core complex structure in this area withgeologic and geophysical methods. Especially we used the method that eliminated localaeromagnetic anomaly. We confirmed the geologic body under the core and wholemetamorphic core complex, then we discussed its formation and evolution and itsore-controlling role to gold mineralization. At last, it was thought that denudations weredifferent in Laoling district, so prospecting should start along major detachment fault.We thought that ore-controlling role of structure was the most important one amongthose of structure, strata, and intrusive rocks. It was proposed that there were two importantmetallogenetic epochs, that is Mesozoic and early Proterozoic. Especially the MesozoicYanshanian was the focus metallogenetic epoch for every type of deposit. Then we dividedthe study area into three metallogenetic belts controlled by deep fault (ductile shear zone),更多还原