【作者】 杨慧；

【导师】 周永章；

【作者基本信息】 中山大学 ， 矿物、岩石、矿床学， 2005， 硕士

【摘要】 地球化学块体是地球上某种元素高含量的巨大岩块。由于其所具有的巨大的成矿元素供应量,为大型或巨型矿床或矿集区的形成提供必要的物质基础。本文系统介绍了地球化学块体理论及其应用于资源潜力预测的方法技术。在总结广东省区域地质特征及金矿成矿条件的基础上,利用广东省1:20万区域化探所取得的Au分析资料,根据地球化学块体的原理及方法,圈定了广东省Au地球化学块体共9个,并详细描述了Au地球化学块体的空间分布及谱系特征,以及块体内地层、岩性及构造特征,初步分析了块体演化过程及与已知矿床的空间分布关系。研究表明,广东省内中型以上的金矿床全部产于块体内,地球化学块体中丰富的成矿元素供应量为矿床的形成,特别大中型矿床或矿集区的形成提供了物质基础。块体的规模反映了块体所在区域的成矿能力,块体规模越大,其形成的大型矿床的可能性就越大。块体中的矿床具体产出位置因不同的成因类型而有所不同:由于构造运动所形成的蚀变破碎带型矿床,其产出部位一般与块体中元素浓集中心吻合好;产于碳酸盐岩或碎屑岩中的微细粒浸染型金矿,其所在块体中元素含量层次较少且没有明显的浓集趋势,矿床在块体中的位置需要综合研究该类型矿床的成矿富集条件确定。最后利用块体内的金属供应量与已知矿床的资源量关系,对块体的成矿率进行计算,块体或异常的成矿率为0.05%~1.07%,根据成矿率分别对全省块体按2.0ng/g、4.0 ng/g两个含量级次的潜在资源量进行了计算,其结果分别为813吨和550.97吨。更多还原

【Abstract】 Geochemical block is defined a giant rock block with high content of one or more elements within the upper earth’s crust. It can provide large metal endowments necessary for the formation of large to giant ore deposits or ore camp. Based on the geochemical block concept and developed methodology,nine gold geological blocks are delineated by calculating the data obtained in regional geochemical mapping in Guangdong and getting 2.0 ng/g as the threshold of the blocks . In this thesis the author summarizes the regional geology and gold mineralization characteristics, describes the spatial distribution of Au geochemical blocks in Guangdong and the characteristics of hierarchically nested geochemical patterns, and analyses the spatial relationship of these blocks with known Au deposits.The study indicates that all the large gold deposits in Guangdong are located within Au geochemical blocks. It demonstrates clearly that large gold endowment is the prerequisite to the occurrence of large gold deposits, and the large blocks indicate the high occurring possibility of large gold deposits . The studies of internal structure of the blocks also reveal that different kind of gold deposits has different spatial relationship. The faults control type gold deposits usually locate on high concentration anomalies and the type of spatial relationship is concentric. The sediment hosted microdisseminated type gold deposit locate on low concentration anomalies, the spatial relationship is uncertain.The mineralization coefficients (Mc) is determined in some blocks on which many explorations has be carried out, the number scale from 0.05%~1.07%. By using Mc the potential Au resources in Guangdong is estimated, the total potential assessed resource of Au in Guangdong is about 813 tons and 550.97 tons.更多还原