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Science in China Series D: Earth Sciences : Volume 48, Issue 3, March 2005

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Pb isotope geochemistry of lead, zinc, gold and silver deposit clustered region, Liaodong rift zone, northeastern China

Content Provider	Springer Nature Link
Author	Chen, Jiangfeng Yu, Gang Xue, Chunji Qian, Hui He, Jianfeng Xing, Zhi Zhang, Xun
Copyright Year	2005
Abstract	33 Pb isotopic analyses were reported for sulfide and hydrothermal carbonate minerals and marble of the Xiquegou lead-zinc, the Zhenzigou zinc-lead and the Gaojiapuzi silver deposits from the Qingchengzi ore field and the Beiwagou zinc-lead deposit in the west, Proterozoic Liaodong rift zone. Pb isotopic ratios of the marble from the Qingchengzi ore field range from 18.24 to 30.63 for $^{206}$Pb/$^{204}$Pb, 15.59 to 17.05 for $^{207}$Pb/$^{204}$Pb and 37.43 to 38.63 for $^{208}$Pb/$^{204}$Pb. The marble gives a Pb-Pb isochron age of 1822±92 Ma, which is interpreted as the age of the metamorphism of the marble. Ore Pb, including Pb of sulfide and hydrothermal carbonate minerals, from the Qingchengzi ore field shows limited variation with $^{206}$Pb/$^{204}$Pb=17.66-17.96, $^{207}$Pb/$^{204}$Pb=15.60-15.74 and $^{208}$Pb/$^{204}$Pb=37.94-38.60. In contrast, ore Pb from the Beiwagou deposit gives different Pb isotopic ratios with $^{206}$Pb/$^{204}$Pb=15.68-15.81, $^{207}$Pb/$^{204}$Pb= 15.34-15.45 and $^{208}$Pb/$^{204}$Pb=35.30–35.68. Pb of all deposits from the Liaodong rift zone is derived from the upper crust. Ore Pb of the Qingchengzi deposits is derived from a young upper crust. The model Th/U ratios of 4.40 to 4.74 for ore Pb are significantly different from that of 1.7 to 4.4 given by the marble of the Qingchengzi ore field, suggesting that marble is not the source of the ore Pb. Ore Pb of the Beiwagou deposit is extracted from its source and the deposit is formed at the Paleoproterozoic era. Different Pb isotopic ratios of the Qingchengzi ore field and the Beiwagou deposit are due to different ages of the deposits and suggest that the two types of deposits are derived from different sources and are possibly formed by different ore-forming processes.
Starting Page	467
Ending Page	476
Page Count	10
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	48
Issue Number	4
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2005-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Pb isotopes source(s) of the ore-forming materials origin of ore deposits Liaodong rift zone Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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