Geological and structural characteristics of gold mineralization in Jinping County (SE Guizhou Province, P.R. China)
Moussa Keita, Ph.D. thesis.
Ph.D. thesis in mineral ressources under the supervision of Dr. Huan-Zhang Lu.
Project description
The most studied Turbidite-hosted gold deposit in the world, are those of the Meguma Group in Nova Scotia in Canada, and those of Central Victoria in Australia. In spite of those studies, the sources of the ore-forming fluids (magmatic vs metamorphic) and the mechanism of gold concentration is still poorly understood. The gold deposit of the Jinping County belongs to this particular class of Turbidite-hosted gold deposit and constitutes the first deposit of this type discovered in China. According to the relative simplicity of the geological and structural contexts, the Jinping terrane could enable better understanding of the source of the ore-forming fluid and the mechanisms of concentration of gold for that type of deposit. The gold mineralization is mainly situated in the turbidite-hosted BPVs (Bedding-Parallel Veins) associated with major structures such as folds, faults and shear zones. However the relationship between the BPVs and those structures remain to be established. Further more the origin, the composition; the conditions of emplacement and evolution of the ore-forming fluid have not been studied as yet. Subsequently our research aims will be: (1) to highlight the characteristics of the gold mineralization and the ore-forming fluid, (2) to identify the structures that controlled the emplacement of the gold bearing quartz veins leading to (3) the proposal of a genetic model for this deposit. In order to realise our aims during our field studies, the geometrical relationship between the gold bearing quartz veins and the different structures will be studied. The samples will be collected for micro structural and metallographic studies at the laboratory. The composition, the evolution and the conditions of emplacement of the ore-forming fluid will be determined from the study of fluid inclusions in gold bearing quartz veins using micro thermometry and Raman spectrometry. These techniques will be supplemented by chemical analyses and isotopic studies.
Question or commentary contact me: moussa_keita@uqac.ca or go to my web site http://geocities.com/keytci/ for more details.
