Seminar

Phosphogenesis of the Kunyang Mine in Yunnan Province: Implications for the environmental change at the beginning of Cambrian

Our planet witnessed a revolutionary change at the Precambrian-Cambrian boundary. Phosphorite of the Kunyang Mine was deposited in the Meishucunian and is separated by a ~535Ma tuff layer into two parts. The lower and upper phosphorite beds show different characteristics, which might be attributed to the environmental change (e.g, oceanic oxygen and temperature). Petrographical, geochemical and isotopic data will be done in this PhD research to reconstruct this environmental change, and to reveal its relationship with co-occurred processes, such as hydrothermal venting activities in Hunan Province and widespread magmatism in the West African craton.

REE mineralization and remobilization in hydrothermal Fe-Cu-REE deposits

Hydrothermal mobilization of REEs has long been an important topic due to its significance on hydrothermal REE deposits and petrogenesis studies. In several Proterozoic Fe-Cu-REE deposits in Southwest China, different hydrothermal REE minerals are present, and show complex textural relationships, which provide a good opportunity to study hydrothermal mobility of REEs. We present petrographic features and compositions of main REE-bearing minerals, aiming to provide constrains on the complex transportation and deposition behaviors of REEs.