华北地台金矿成矿规律

来源 :南京大学学报(自然科学版) | 被引量 : 0次 | 上传用户:vipshaw
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根据长期对华北地台金矿的研究 ,发现一系列有意义的地质地球化学特征并得出许多重要结论 ,如 :1.华北地台是由许多地体拼贴而成 ,如华熊 ,嵩箕 ,鲁西 ,胶北 ,胶南和黄海地体等 ;2 .基底地层年代学是确定地体类型的重要基础 .0 型地体是具有太古代绿岩带和早元古绿岩带 ;C 型地体祗具有太古代绿岩带 ,前者有利于金矿的形成 ;3.中生代华北地台构造环境是岩浆作用和成矿作用的决定因素 .这与中生代古太平洋板块和初始欧亚板块强烈挤压碰撞俯冲作用有联系 ;4 .主断裂系统是金矿床 ,矿田和矿带分布的主要因素 ;5.高级区域变质作用是金和成矿流体活动化转移的因素之一 ;6 .交代蚀变作用和它的分带是成矿模式的基础 ;7.花岗岩的岩浆作用和混合岩化作用是金和成矿流体活化转移的重要因素 ;8.Pb ,S ,O ,H ,C ,Nd和Sr同位素特征表明金和成矿流体的多来源性 ;9.形成于活动大陆边缘和造山带与金矿有关的钙 碱性煌斑岩来源于由板块 ,地体和板片俯冲作用引起的富集地幔 ;10 .根据与金矿有联系的热液成矿作用的温度一般可以划分三个阶段 ;其中 350℃~ 2 50℃是金成矿的主要温度范围 Based on the long-term research on the gold deposits in the North China Platform, a series of significant geological and geochemical features have been discovered and many important conclusions have been drawn. For example, the North China platform is made up of collages of many terrains such as Hua Xiong and Song Kei, Luxi, Jiaobei, Jiaonan and Yellow Sea terranes, etc. 2. Basement geochronology is an important foundation for determining the type of the terrane. Type 0 terrane is composed of Archean greenstone belt and early Proterozoic greenstone belt. C Type geotectonic only with Archean greenstone belt, the former is conducive to the formation of gold deposits; 3. The tectonic setting of the Mesozoic North China platform is the determining factor of magmatism and mineralization, which is strongly related to the Mesozoic Paleo-Pacific plate and the initial Eurasian plate 5. The main fault system is the main factor in the distribution of gold deposits, ore fields and ore belts. 5. The metamorphism of the high-level regions is one of the factors that make the migration of gold and ore-forming fluids active. The alteration and its zonation are the basis of the metallogenic model. 7. The magmatic and migmatization of granites are important factors for the activation and migration of gold and ore-forming fluids. 8.Pb, S, O, H, C, Nd and Sr isotopic characteristics indicate multi-source of gold and ore-forming fluids; The calc-alkaline lamprophyre formed on the active continental margin and the orogenic belt is related to the gold-bearing lamprophyre derived from the enrichment of the mantle caused by the subduction of plates, terranes and plates. 10. According to the hydrothermal mineralization associated with the gold deposit The role of the temperature can generally be divided into three stages; of which 350 ℃ ~ 2 50 ℃ is the main temperature range of gold mineralization
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