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Genesis of the Wulong gold deposit, Liaoning Province, NE China: Constrains from noble gases, radiogenic and stable isotope studies
Alternative TitleGenesis of the Wulong gold deposit, Liaoning Province, NE China: Constrains from noble gases, radiogenic and stable isotope studies
Peng Zhang; Linlin Kou; Yan Zhao; Zhongwei Bi; Deming Sha; Renping Han; Zhumin Li
2020
Source PublicationGeoscience Frontiers
ISSN1674-9871
Volume11Issue:2Pages:547-563
AbstractThe Wulong lode deposit contains over 80 tonnes of gold with an average grade of 5.35g/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 U–Pb and pyrite Rb–Sr 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 U–Pb 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±1Ma, 124±1Ma, 123±1Ma, 120±1Ma, 119±2Ma, and 115±2Ma, respectively. The pyrite Rb–Sr isochron age is 119±1Ma, indicating that both magmatism and mineralization occurred during the Early Cretaceous. The δ18OH2O values of ore-forming hydrothermal fluids from the quartz–polymetallic sulfide vein stage vary from 4.8‰ to 6.5‰, and the δDV-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 (207Pb/204Pb=15.51–15.71, 206Pb/204Pb=17.35–18.75, 208Pb/204Pb=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 magmatic–hydrothermal origin. Keywords: The Wulong gold deposit, Zircon U–Pb, Pyrite Rb–Sr, H–He–O–Ar–S–Pb isotopes, Liaodong Peninsula
KeywordGeology QE1-996.5
Indexed ByCSCD
Language英语
Funding Project[National Key Research and Development Program] ; [National Natural Science Foundation of China] ; [Geological Investigation Project of the China Geological Survey]
CSCD IDCSCD:6681508
Citation statistics
Cited Times:4[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/145461
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
Peng Zhang,Linlin Kou,Yan Zhao,et al. Genesis of the Wulong gold deposit, Liaoning Province, NE China: Constrains from noble gases, radiogenic and stable isotope studies[J]. Geoscience Frontiers,2020,11(2):547-563.
APA Peng Zhang.,Linlin Kou.,Yan Zhao.,Zhongwei Bi.,Deming Sha.,...&Zhumin Li.(2020).Genesis of the Wulong gold deposit, Liaoning Province, NE China: Constrains from noble gases, radiogenic and stable isotope studies.Geoscience Frontiers,11(2),547-563.
MLA Peng Zhang,et al."Genesis of the Wulong gold deposit, Liaoning Province, NE China: Constrains from noble gases, radiogenic and stable isotope studies".Geoscience Frontiers 11.2(2020):547-563.
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