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Minerals 2019, 9(2), 104; https://doi.org/10.3390/min9020104

Geology, Geochronology and Geochemistry of Weilasituo Sn-Polymetallic Deposit in Inner Mongolia, China

1
College of Earth Sciences, Jilin University, Changchun 130061, China
2
Shenyang Geological Survey Center, CGS, Shenyang 110034, China
3
Inner Mongolia Weilasituo Mining Industry Co. Ltd., Chifeng 025350, China
4
Chengdu Geological Survey Center, CGS, Chengdu 610000, China
*
Author to whom correspondence should be addressed.
Received: 2 December 2018 / Revised: 3 February 2019 / Accepted: 10 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Polymetallic Metallogenic System)
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Abstract

The recently discovered Weilasituo Sn-polymetallic deposit in the Great Xing’an Range is an ultralarge porphyry-type deposit. The mineralization is closely associated with an Early Cretaceous quartz porphyry. Analysis of quartz porphyry samples, including zircon U-Pb dating and Hf isotopies, geochemical and molybdenite Re-Os isotopic testing, reveals a zircon U-Pb age of 138.6 ± 1.1 Ma and a molybdenite Re-Os isotopic age of 135 ± 7 Ma, suggesting the concurrence of the petrogenetic and metallogenic processes. The quartz porphyry has high concentrations of SiO2 (71.57 wt %–78.60 wt %), Al2O3 (12.69 wt %–16.32 wt %), and K2O + Na2O (8.85 wt %–10.44 wt %) and A/CNK ratios from 0.94–1.21, is mainly peraluminous, high-K calc-alkaline I-type granite and is relatively rich in LILEs (large ion lithophile elements, e.g., Th, Rb, U and K) and HFSEs (high field strength elements, e.g., Hf and Zr) and relatively poor in Sr, Ba, P, Ti and Nb. The zircon εHf(t) values range from 1.90 to 6.90, indicating that the magma source materials were mainly derived from the juvenile lower crust and experienced mixing with mantle materials. Given the regional structural evolution history, we conclude that the ore-forming magma originated from lower crust that had thickened and delaminated is the result of the subduction of the Paleo–Pacific Ocean. Following delamination, the lower crustal material entered the underlying mantle, where it was partially melted and reacted with mantle during ascent. The deposit formed at a time of transition from post-orogenic compression to extension following the subduction of the Paleo–Pacific Ocean. View Full-Text
Keywords: zircon U-Pb dating; molybdenite Re-Os dating; zircon Hf isotopes; Weilasituo Sn-polymetallic deposit; Inner Mongolia zircon U-Pb dating; molybdenite Re-Os dating; zircon Hf isotopes; Weilasituo Sn-polymetallic deposit; Inner Mongolia
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Yang, F.; Sun, J.; Wang, Y.; Fu, J.; Na, F.; Fan, Z.; Hu, Z. Geology, Geochronology and Geochemistry of Weilasituo Sn-Polymetallic Deposit in Inner Mongolia, China. Minerals 2019, 9, 104.

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