Genesis and Magmatic Evolution of the Gejiu Complex in Southeastern Yunnan, China
Source abstract
Abstract
Gejiu, a prominent tin–polymetallic ore district, is distinguished by its diverse mineral complexes. However, the genesis of these complexes and their relationship with mineralization remain inadequately studied. This study utilized whole-rock geochemical analyses to investigate the magmatic sources and petrogenesis of different complex types, aiming to elucidate their implications for tin–polymetallic mineralization. The results indicate that gabbro, monzonite, diorite, and syenite are derived from enriched mantle-derived magmas and have undergone limited crustal contamination. Granites are formed by the mixing of mantle- and crust-derived magmas, involving both physical mixing and chemical diffusion. Major and trace element characteristics suggest that the Gejiu granites predominantly exhibit features of both A-type and I-type granites. Harker diagrams and whole-rock indicators, such as Nb/Ta and Zr/Hf, suggest that granites experienced a two-stage fractional crystallization process, ultimately forming highly evolved biotite monzogranite. Fractional crystallization is the dominant mechanism controlling magmatic evolution, while high-temperature melting and biotite decomposition reactions are critical for the formation of the world-class Gejiu tin deposit.
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Research context
OpenAlex topics: Geological and Geochemical Analysis · Geochemistry and Geologic Mapping · earthquake and tectonic studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Yunnan Nonferrous Geological Bureau, Kunming 650051, China
Funding
Yunnan Provincial Science and Technology Plan Project · Yunnan Provincial “Xingdian Talent Support Program” for Young Talents
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