Organically geochemical characteristics of the Fankou Pb-Zn deposit in North Guangdong Province, Chi

• 作 者: SUN Yuzhuang CHEN Jianping LU
• 机 构: Key Laboratory of Resource Exploration Research of Hebei Province,Guangzhou Institute of Geochemistr
• 出 处: 中国地球化学学报（英文版）
• 发表日期: 2004年期
• 关键词: organic geochemistry ore formation bacterial sulfate reduction thermochemical su

The Fankou Pb-Zn deposit is a very important and famous deposit in China. The time of Pb-Zn enrichment has been debated for a long time in this deposit. A total of seventeen samples of three sections were taken from the Fankou mine for the study of mineralization time and the mechanism of ore formation. The samples were analyzed by microscope, Soxhlet-extract, GC, and GC/MS methods. The results indicated that organic bulk parameters vary with the Pb-Zn contents in different samples and clearly were influenced by ore sulfide formation. Organically geochemical parameters (MPI 1, CPI) indicate that the paleotemperatures in the Fankou deposit are lower than 80℃ in all three sections. Sulfides in the wall rocks might occur mainly during synsedimentation or early diagenesis by BSR or partly by PR, rather than by TSR at such low temperatures, this stage may be the first mineralization stage. Sulfides near the faults might be formed by TSR after sedimentation, this stage may be the second mineralization stage.