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甘肃省铜矿主要类型与勘查前景研究
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摘要
甘肃铜矿资源丰富,成矿类型发育齐全。但是,已探明储量与铜矿化强度极不相称;重要铜矿生产基地的资源保障形势严峻。深化区域成矿规律认识与拓宽勘查研究思路尤为重要。
     本论文在总结、分析前人成果资料基础上,以区域成矿学理论为指导,运用现代地质学、矿床学及相关专业、学科的基本理论与方法,综合多种成矿信息,对甘肃省铜矿主要成矿类型及其成矿地质构造背景、时空分布特征与主要控(成)矿条件进行了研究;从矿产勘查的角度,初步总结了甘肃铜、金及多金属矿产的发育、富集与区域成矿规律;探讨了印支-燕山期构造-岩浆活动与大型-超大型铜矿床的形成关系;研究分析了甘肃铜矿资源的勘查前景与找矿方向,提出了该区矿产勘查研究新思路。
     通过研究认为:镁铁质-超镁铁质岩型、海相火山岩型及斑岩型三种铜矿类型,是甘肃的主要铜成矿类型,其主成矿阶段为中元古代、古生代以及中生代;特定大地构造背景下形成的含矿建造、区域性深大断裂以及后期斜向构造-岩浆活动带,是该区铜、金及多金属成矿的主要控矿因素,三者在空间上的复合是矿床体形成的有利部位。甘肃境内由西向东增强的北东向构造带,是我国东部滨西太平洋印支-燕山期构造岩浆活动带向大陆西部的延伸表现;伴随该期构造-岩浆活动,区内发生了重要的区域性成矿作用,并使处于该期构造活动带的先期金属矿产遭受了较强的叠加与再生改造。甘肃西秦岭、祁连、龙首山等成矿带的大型-超大型金属矿床,是在地质构造发展演化过程中“生长”而成的;研究分析其“生”成背景与后期成“长”的条件,有利于客观认识成矿与富集规律、合理确定研究思路与勘查方案等。提出了进一步找矿工作部署与矿产勘查研究的新思路;指出了主要铜成矿类型的成矿有利区带,划分了成矿远景区;从资源勘查开发角度,探讨了铜矿生产基地后续资源保障与老矿山解困的主要途径。
There are abundant copper ore resources and mineralization types of copper ore deposits in Gansu, China, but the reserves explored is not concordant with of intensity of copper mineralization, which in the providing reserves for important bases of the copper mine productions there is a serious question. It is very important that the understanding of regional metallogenic rules should be emphasized and the thinking of exploration and research opened up.
    In this thesis, mainly metallogenic types, tectonic setting, space-time distributions and the ore-controlling and metallogenic conditions for copper ore deposits in Gansu province are studied on based inducing past formation which basic theories and methods of the modern geology, mineral deposits and related learning are applied and a serious of formation synthesized throughout depending on guide of regional.-metallogenic theories. A rule of development, enrichment and regional metallogeny would be preliminary summaries in terms of analyzing mineral prospecting for Gansu's copper, gold and polymetallic minerals, and the relation between the Indosinian-Yanshan structural-magmatic activities is studied and exploration prospect and positions analyzed as well as a new countermeasure and thinking about research for minerals in this area be suggested.
    Throughout researching it has been found that three main types of copper deposits, which mafic-ultramafic rock, marine volcanic rock and porphyry, with Middle Proterozoic, Paleozoic and Mesozoic in Gansu, China. The Cu-bearing formation, deep major faults and late structural-magmatic zones formed in specific geotectonic setting are main ore-controlling and metallogenic factors for copper, gold and polymetallic minerals in this area, and their convergent positions are effective ones formed ore bodies in space. The north-eastern structural zones which become intensity from the western part to the eastern one in Gansu show a influence of marginal-west pacific Indosinian-Yanshan tectonic-magmatic belt on the western part of China's continent, and not only a important
    
    
    
    regional metallization had developed but also early-formed minerals were intense changed and enriched with the tectonic-magmatic activity. In the west Qinling, Qilian and Longshoushan metallogenic zones, some larger-ultra larger mineral deposits were formed throughout a model of "bearing" in long course of geological evolution. Studying their geologic setting of "formation" and condition of late "development" would help us to objectively realize rules for the metallization and enrichment and define reasonable thinking for research and plan for exploration. In this thesis a deeply arrangement of exploration and new view of search for minerals has been suggested, beneficial metallogenic zones for types of main copper deposits pointed out and prospective prognosis area divided, and the providing reserves for bases of the copper mine productions and main ways going on development for old mines has also been discussed.
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