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Genesis of the Wulong gold deposit, Liaoning Province, NE China: Constrains from noble gases, radiogenic and stable isotope studies

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文摘 TheWulong lode deposit contains over 80 tonnes of gold with an average grade of 5.35 g/t.It is one of the largest deposits in Dandong City, Liaoning Province in northeast China.Previous studies on the deposit focused on its geological characteristics, geochemistry, fluid inclusions, and the timing of gold mineralization.However, controversy remains regarding the origin of the ore-forming fluids and metals, and the genesis of the gold deposit.This paper presents zircon UePb and pyrite RbeSr ages and S, Pb, He, and Ar isotopic results along with quartz H and O isotopic data for all litho-units associated with the deposit.Laser ablation inductively coupled mass spectrometry measurements yielded zircon UePb dates for samples of pre-mineralization rocks like granite porphyry dike, the Sanguliu granodiorite, fine-grained diorite, and syn-mineralization diorite, as well as post-mineralization dolerite, and lamprophyre;their emplacement ages are 126 ± 1 Ma, 124 ± 1 Ma, 123 ± 1 Ma, 120 ± 1 Ma, 119 ± 2 Ma, and 115 ± 2 Ma,respectively.The pyrite RbeSr isochron age is 119 ± 1 Ma, indicating that both magmatism and mineralization occurred during the Early Cretaceous.The δ~(18)OH_2O values of ore-forming hydrothermal fluids from the quartzepolymetallic sulfide vein stage vary from 4.8& to 6.5&, and the dDV-SMOW values are between -67.7& and -75.9&, indicating that the ore-forming fluids were primarily magmatic.The noble gas isotope compositions of fluid inclusions hosted in pyrite suggest that the ore-forming fluids were dominantly derived from crustal sources with minor mantle input.Sulfur isotopic values of pyrite vary between 0.2& and 3.5&, suggesting that S was derived from a homogeneous magmatic source or possibly from fluids derived from the crust.The Pb isotopic compositions of sulfides(~(207)Pb/~(204)Pb = 15.51 e15.71, ~(206)Pb/~(204)Pb = 17.35-18.75, ~(208)Pb/~(204)Pb = 38.27-40.03)indicate that the Pb of the Wulong gold deposit is a mixture of crust and mantle components.Geochronological and geochemical data, together with the regional geological history, indicate that Early Cretaceous magmatism and mineralization of the Wulong gold deposit occurred during the rollback of the subducting Paleo-Pacific Plate, which resulted in lithospheric thinning and the destruction of the North China Craton(NCC), which indicates that the deposit is of magmaticehydrothermal origin.
来源 Geoscience Frontiers ,2020,11(2):547-563 【核心库】
DOI 10.1016/j.gsf.2019.05.012
关键词 The Wulong gold deposit ; Zircon UePb ; Pyrite RbeSr ; HeHeeOeAreSePb isotopes ; Liaodong Peninsula
地址

Shenyang Geological Survey Center, China Geological Survey, Shenyang, 110034

语种 英文
文献类型 研究性论文
ISSN 1674-9871
学科 地质学
基金 supported by the National Key Research and Development Program ;  国家自然科学基金 ;  the Geological Investigation Project of the China Geological Survey
文献收藏号 CSCD:6681508

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