Abstract:The Yagongtang pluton is closely related to the formation of deep lead-zinc copper iron polymetallic deposits. This article takes the Yagongtang rock mass as the research object, studies the petrological and geochemical characteristics of the rock mass, and explores its diagenetic mechanism. Research has shown that the lithology of the Yagongtang rock mass is relatively simple, mainly composed of granodiorite, belonging to the quasi aluminum rich sodium high potassium calcium alkaline rock series. The rock mass rises along structural fractures in an environment transitioning from compression to extension, and forms by invading the near surface structural space. The diagenetic material is a crust mantle mixed type, belonging to the typical Type I granite. The distribution curve of rare earth elements shows a right skewed pattern with high left and low right, indicating that light rare earths are relatively enriched and differentiated from heavy rare earths. The fractionation of light and heavy rare earths is relatively obvious, indicating a strong loss of heavy rare earths and enrichment of light rare earths.
