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.
Highlights
The southern Great Xing’an Range (SGXR) in southeastern Inner Mongolia is part of the eastern section of the Central Asian Orogenic Belt (Xing’anling Mongolian Orogenic belt)
The deposit formed at a time of transition from post-orogenic compression to extension following the subduction of the Paleo–Pacific Ocean
We present LA-ICP-MS zircon U-Pb ages, molybdenite Re-Os ages, new whole-rock elemental compositions of the quartz porphyry and in situ zircon Hf isotopic data for the Weilasituo Sn-polymetallic deposit
Summary
The southern Great Xing’an Range (SGXR) in southeastern Inner Mongolia is part of the eastern section of the Central Asian Orogenic Belt (Xing’anling Mongolian Orogenic belt). Multistage tectonic, magmatic, sedimentary and metamorphic events characterize the metallogenic background of the SGXR and have resulted in the development of extensive granitic plutonic rocks, intermediate-acidic volcanic-sedimentary rocks and Paleozoic strata [4,5,6]. These events have given rise to associated porphyry-type molybdenum deposits, magmatic hydrothermal vein-type. Mo deposit and Baiyinnuoer Ag-Zn deposit; [7,8]), (II) Early to Mid-Jurassic Ma; e.g., the Mengentaolegai Ag-Pb-Zn deposit; [9]), (III) Late Jurassic (150–153 Ma; e.g., the Mengentaolegai Ag-Pb-Zn deposit; [9]), (III) Late Jurassic (150–153 Ma; e.g., the Budunhua Cu deposit, Budunhua Cu deposit, Hashitu Mo deposit, Jiguanshan Mo deposit, Zhanzigou Mo deposit, Hashitu Mo deposit, Jiguanshan Mo deposit, Zhanzigou Mo deposit, Maodeng Cu-Sn deposit and Maodeng Cu-Sn deposit and Aonaodaba Ag-Cu deposit, [10,11,12,13]), and (IV) the early stage of the Aonaodaba Ag-Cu deposit, [10,11,12,13]), and (IV) the early stage of the Early Cretaceous
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