Genesis of Metallic Mineralization in Continental Rift Basins: A Study of Sandstone-hosted Pb-Zn-Sr Deposits in a Tertiary Rift Basin, Yunnan, China

大陆裂谷盆地金属矿化成因：中国云南第三纪裂谷盆地砂岩中铅锌锶矿床研究

• 批准号: 9405546
• 负责人: J. Richard Kyle
• 金额: $ 11万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-04-01 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9405546&HistoricalAwards=false
• 关键词: Genesis; Metallic; Mineralization; Continental; Rift

9405546 Kyle The Jinding deposit in Yunnan Province is the largest Pb-Zn deposit in China and the world's largest and geologically youngest example of the "sandstone-type" Pb-Zn deposit. The overall research plan is to establish the detailed geologic framework for the Jinding and associated deposits through a combination of field and mine mapping, core logging, and petrology. Sections of drill holes through the deposit have been logged and sampled to provide the three-dimensional framework to govern petrographic and geochemical studies. Brines have been collected from wells within the region for comparison with the "ore-forming" fluids as evidenced by fluid inclusions in diagenetic cements. Petrography will be used to assess relevant porosity and permeability relationship of the stratigraphic section. detailed sampling will maximize the results of geochemical and isotopic analyses. Isotope studies will include C and O analyses of carbonates, S isotope studies of sulfates (celestite and gypsum), and complementary S and Pb isotope studies of sulfide minerals. Sr isotope studies will be made of major Sr-bearing phases (celestite, gypsum, and calcite). The project results will make a significant contribution to the knowledge of sediment-hosted mineral deposits, and particularly to our understanding of the link between fluid evolution and diagenetic processes in continental basins.

9405546云南凯尔金顶铅锌矿床是中国地区最大的铅锌矿床，也是世界上规模最大、地质最年轻的“砂岩型”铅锌矿床。总体研究计划是通过野外和矿山填图、岩心测井和岩石学相结合的方法，建立金顶及其伴生矿床的详细地质格架。通过矿床的部分钻孔已经被记录和采样，以提供管理岩石学和地球化学研究的三维框架。从区内的井中采集了卤水，并与成岩胶结物中的流体包裹体所证明的“成矿”流体进行了对比。岩石学将被用来评估地层剖面的相关孔隙度和渗透率关系。详细的采样将最大限度地提高地球化学和同位素分析的结果。同位素研究将包括碳酸盐的碳和氧分析，硫酸盐(天青石和石膏)的S同位素研究，以及硫化物矿物的补充S和铅同位素研究。锶同位素研究将对主要含锶物相(天青石、石膏和方解石)进行。该项目的成果将对了解以沉积物为主的矿藏做出重大贡献，特别是有助于我们理解陆相盆地流体演化和成岩过程之间的联系。