Abstract
The Maozaishan Sn deposit, located south of the Dayishan ore field in the Nanling Range, is a newly explored greisen-type Sn deposit. Two muscovite samples from tin-bearing ores yielded 40Ar/39Ar plateau ages of 154.7 ± 1.1 Ma (Mean standard weighted deviation (MSWD) = 0.48) and 152.6 ± 0.7 Ma (MSWD = 0.25), respectively. Zircon U–Pb dating result of fine-grained biotite monzogranite in the Maozaishan mining area shows that these zircon grains can be subdivided into two populations, with ages of 154.2 ± 2.0 Ma (MSWD = 0.51) and 159.6 ± 1.9 Ma (MSWD = 0.09), respectively, indicating that the monzogranite is formed by a multi-stage magmatic event. It is indicated that formation of the Maozaishan Sn deposit is closely related to the Middle Jurassic granitic magmatism. Based on the trace element compositions of zircon grains, the calculated magma temperatures and oxygen fugacity (log(fO2)) values range from 638 °C to 754 °C (mean = 704 °C) and from −18.9 to −15.8 (mean = −17.1), respectively. In addition, these intrusive rocks in the Dayishan ore field belong to highly fractionated granites and are characterized by low oxygen fugacity and crust–mantle origin, which are consistent to these tin-bearing granites in the Nanling Range and in favor of the Sn mineralization.
Highlights
South China, as one of the most important metallogenic domains around the world, is famous for the super tungsten–tin (W–Sn) and other rare metal resources [1,2,3,4,5]
These ages indicate that the Dayishan composite pluton was multi-stages of magmatism ranging from the Triassic to Cretaceous, it was proposed that formed by multi-stages of magmatism ranging from the Triassic to Cretaceous, it was the Middle Jurassic magmatism was closely related to the Sn mineralization in the Dayishan ore proposed that the Middle Jurassic magmatism was closely related to the Sn mineralization in the field [18,19]
154 Ma, which is closely related to the coeval granitic magmatism
Summary
South China, as one of the most important metallogenic domains around the world, is famous for the super tungsten–tin (W–Sn) and other rare metal resources [1,2,3,4,5]. Most of the W–Sn resources are hosted in the Nanling Range, which is located in the central South China [6,7,8,9,10]. Several large- to super large-scale Sn polymetallic deposits were hosted in these ore fields, including Furong, Xintianling, Xianghualing, Da’ao, and Xitian (Figure 1) [7,14,15,16]. Formation of these Sn deposits are Minerals 2019, 9, 773; doi:10.3390/min9120773 www.mdpi.com/journal/minerals closely related to the coeval granitic magmatic intrusions, with ages of 165 to 150 Ma [4,6]. More and more Sn polymetallic deposits were identified in the Nanling Range, the relationship more and more Sn polymetallic deposits were identified in the Nanling Range, the between the granitic magmatism and Sn mineralization still needs to be explored
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