Geochemical Characteristics and Geological Significance of Cassiterite in the Dalong Tin Deposit, Baoshan Block, SW China
2022
Chuanyu Zhang, Wanting Li, Haijun Yu, Yingxiang Lu, Jianze Sha | Shusheng Yang
The Dalong tin deposit, located in the Luziyuan polymetallic ore field of the southern Baoshanblock, Southwest China, is composed of lenticular and bedded orebodies hosted in a Cambrianslate-marble sequence. As the only tin deposit in the orefield, the genesis of the Dalong deposit isof great significance to the understanding of regional metallogenic regularity. Based on a systematicfield survey and petrographic observation, EPMA and LA-ICP-MS major/trace element analyses ofcassiterite were carried out in this study. The enrichment of Fe, W, and Ti in cassiterite, as well as thedepletion of Nb, Ta, and Mn, reveal cassiterite’s features in granitic magmatic-hydrothermal deposits.The Dalong deposit can be categorized as a magmatic-hydrothermal vein-type deposit because of itssulfur isotopic properties, and the main sources of ore-forming fluid and minerals are thought to beburied intermediate-acid intrusions in the mining area’s depths.
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