地球化学岩相学的研究内容、方法与应用实例

Preliminary Research Demonstration on Geochemical Lithofacies: Objective, Methodology, and Case Applications

地球化学岩相学主要研究方法包括岩相地球化学研究、矿物地球化学岩相学研究、多矿种共伴生富集成矿的技术创新和理论创新、构造变形筛分-同位素地球化学精确定年、复杂叠加成岩成矿系统的内部时间-空间结构、成岩成矿演化历史重建、受损生态环境系统的工程地球化学修复理论和技术等方面。在总结以往地球化学岩相学研究基础上,初步探索了地球化学岩相学研究内容、研究方法、应用实例和应用效果。以塔西地区砂砾岩型铜铅锌-铀区域成矿系统、智利月亮山铁氧化物铜金型矿床(IOCG)叠加成矿系统、云南个旧老厂砂锡和老挝三水铝石型铝土矿床等为例,论述了其地球化学岩相学类型及应用实例。以化学物相法和矿物地球化学岩相学方法等,揭示塔西富烃类还原性成矿流体多重耦合成矿作用特征,智利月亮山IOCG矿床电气石热液角砾岩构造系统物质组成和成岩成矿环境演化规律。

Research methodology of geochemical lithofacies is to be oriented by technological issues or conundrum, and to be subsidiary directed by applications of theoretic basis. However it is to be steered by integrated knowledge and cross-sectional study while it is to be focused on the core value and innovative technology. The main research methods include geochemical study of rock-ore lithofacies, lithofacies study of mineral geochemistry, innovative techniques and theory for intergrowths of the mineral commodity, combinations of screening classifications of tectonic deformations and precise dating of isotope geochemistry, reconstructions of history of diagenesis mineralization evolution, and geochemical restoration engineering in the damaged ecologically environment system. Based on reviews on research of geochemical lithofacies, preliminary on objective and methodology of geochemical lithofacies was put forward, and their case study and case applications were introduced in this paper. Geochemical lithofacies, their case study, and case applications were presented in this paper. Based on the study of chemical phase and mineral geochemical lithofacies, the multiple coupling relationships between hydrocarbon-rich basin fluid with reductibility and metallogenic system of glutenite-type Cu-Pb-Zn-U deposits in the Western Tarim Basin were better understood, while materials and diagenesis-mineralization for superimposing hydrothermal tourmaline- breccia-type system of iron-oxide copper-gold deposits （IOCG） were revealed. Residual placer tin deposit in Gejiu area of Yunnan Province in China and gibbsite-type bauxite deposits and weathering crust of basalt in BolavenPlateau in Laos were uncovered on the basis of pH and mineral geochemical lithofacies.