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The origin of both deposit systems is much debated.The model ages of the five samples from the Datuanshan stratabound deposit vary from 138.0 ± 3.2 to 140.8 ± 2.0 Ma, with a mean of 139.3 ± 2.6 Ma; their isochron age is 139.1 ± 2.7 Ma with an initial Os ratio of 0.7 ± 8.1 (MSWD = 0.29).These data indicate that the porphyry/skarn systems and the stratabound deposits have the same age and suggest an origin within the same metallogenic system.Albite Ar dating of the magnetite porphyry deposits indicates that they formed at 123 to 125 Ma, i.e., 10–20 Ma later.Both mineralization styles characterize transitional geodynamic regimes, i.e., the period around 140 Ma when the main NS-trending compressional regime changed to an EW-trending lithospheric extensional regime, and the period of 125–115 Ma of dramatic EW-trending lithospheric extension.cassiterite-sulfide ore within the proximal skarn in contact with the Gaofengshan biotite granite, and fault-controlled stratiform-like cassiterite–iron oxide ± sulfide ore in the distal carbonate country rock. U ages of 84.3 ± 1.4 Ma, 85.1 ± 1.0 Ma and 83.5 ± 2.1 Ma, respectively.

The three mineralization ages are consistent with the emplacement age of the Gaofengshan granite (85.8 ± 0.6 Ma) within error, suggesting a close temporal link between tin mineralization and granitic magmatism.

Cassiterite grains can be divided into two types based on cathodoluminescence (CL) illustrations, namely euhedral Cst I and veinlet-like Cst II.

In the cassiterite–sulfide ore, Cst I has clear oscillatory zonation and is dull luminescing.

The Gaosong Sn–Cu deposit in the Gejiu ore district, SW China, is a large cassiterite–sulfide deposit, hosting total ore reserves of 67.4 Mt @1.3% Sn and 19.0 Mt @1.1% Cu.

Two types of mineralization developed in the deposit, i.e.

The Late Cretaceous crystallization ages and trace element characteristics demonstrate that cassiterites from both ores were formed in a magmatic-hydrothermal system associated with the Gaofengshan granite, and preclude the SEDEX origin of the stratiform-like cassiterite–iron oxide ± sulfide ore.

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