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U-Pb Ages, O Isotope Compositions, Raman Spectrum, and Geochemistry of Cassiterites from the Xi’ao Copper-Tin Polymetallic Deposit in Gejiu District, Yunnan Province

1
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3
Yunnan Tin Company Group, Gejiu 610000, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(4), 212; https://doi.org/10.3390/min9040212
Received: 24 February 2019 / Revised: 27 March 2019 / Accepted: 28 March 2019 / Published: 31 March 2019
(This article belongs to the Section Mineral Deposits)
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Abstract

The Xi’ao Cu-Sn polymetallic deposit is located in the inner alteration zone of the Laoka granite. The ore bodies extend to 400 m in the granite rock and primarily occur with fluorite and potassic alterations. Two cassiterite samples of altered rock-type ore and one tourmaline vein-type ore in the Xi’ao Cu-Sn polymetallic deposit yielded U-Pb ages of 83.3 ± 2.1 Ma, 84.9 ± 1.7 Ma, and 84.0 ± 5.6 Ma, respectively. The Raman spectrum peak values of A1g were shifted to a lower frequency, possibly due to the substitution of Sn with Nb, Ta, Fe, and Mn. Measured δ18O values of cassiterite samples and calculated δ18OH2O values for the ore-forming fluid indicate that the latter was mostly derived from magma. The high Fe and Mn abundances for cassiterite are consistent with those of hydrothermal origin. The Nb, Ta, and Ti contents indicate that cassiterites in the Xi’ao deposit likely formed in a metallogenic environment that was largely affected by granitic magmatism. Therefore, we conclude that the Xi’ao deposit is a magmatic hydrothermal deposit. View Full-Text
Keywords: cassiterite; U-Pb ages; O isotope; Raman spectrum; Xi’ao Cu-Sn deposit; Gejiu district cassiterite; U-Pb ages; O isotope; Raman spectrum; Xi’ao Cu-Sn deposit; Gejiu district
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhao, Y.; Chen, S.; Huang, Y.; Zhao, J.; Tong, X.; Chen, X. U-Pb Ages, O Isotope Compositions, Raman Spectrum, and Geochemistry of Cassiterites from the Xi’ao Copper-Tin Polymetallic Deposit in Gejiu District, Yunnan Province. Minerals 2019, 9, 212.

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