Abstract: Xianghualing tin deposit is one of the most important tin-polymetallic deposits in Nanling Region, and hosts abundant
Sn-bearing minerals. In this paper, the mineralogical characteristics of Sn-bearing minerals from the Xianghualing skarn were
systematically analyzed by electron microprobe technology, in combination with microscopic and field observations, with the aims
to reveal metallogenic processes, fluids features, and origin of Sn. The results of this study show that (1) Sn-bearing minerals in
the Xianghualing skarn include Sn minerals (cassiterite, nigerite, mengxianminite etc.) and Sn-rich minerals (pargasite, spinel,
prehnite, taaffeite etc.); (2) Three stages of Sn mineralization were distinguished: during the early skarn stages, Sn entered into
the structures of spinel, amphibole, and other rock-forming minerals, leading to the formation of Sn-rich minerals; Sn minerals
(cassiterite, nigerite, mengxianminite etc.) gradually crystallized during the oxidation stages, and in the hydrothermal stages early
Sn-bearing minerals experienced hydrothermal alteration with local precipitation of cassiterite, and/or the formation of minerals
with Sn-rich rims by Sn-rich fluids; (3) hydrothermal fluids are enriched in F, CO2 and Li, which controlled the processes of
enrichment, transport, and crystallization of Sn, and (4) Sn in the Xianghualing skarn was fundamentally derived from the ambient
strata, and the metallogenic processes of Sn reflect a geochemical circulation of Sn in Earth Crust.

Key words: Sn-bearing minerals, metallogenic processes of Sn, skarn, Xianghualing