| Pb isotope geochemistry of lead, zinc, gold and silver deposit clustered region, Liaodong rift zone,northeastern China |
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| 作者姓名： | CHEN Jiangfeng YU Gang XUE Chunji QIAN Hui HE Jianfeng XING Zhi & ZHANG Xun . School of Earth and Space Sciences University of Science and Technology of China Hefei China . |
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| 作者单位： | CHEN Jiangfeng1，YU Gang1，XUE Chunji2，QIAN Hui1，HE Jianfeng1，XING Zhi1 & ZHANG Xun1 1. School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026，China; 2. Department of Geology，Chang’an University，Xi’an 710054，China |
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| 摘 要： | As one of the important deposit-clustered regionsof China, the Liaodong (eastern Liaoning Province)rift zone contains many large lead, zinc, gold, boron,magnesite and talc ore deposits with a long mininghistory. Recently, large-scale Xiaotongjiapuzi gold andGaojiapuzi silver deposits were discovered in the re-gion. Much work on the origin of these deposits hasbeen carried out, however, the discrepancy on the ageand the metal source of the deposits still rem- discu…
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| 收稿时间： | 28 April 2003 |
Pb isotope geochemistry of lead,zinc, gold and silver deposit clustered region,Liaodong rift zone,northeastern China |
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| Jiangfeng?ChenEmail author,Gang?Yu,Chunji?Xue,Hui?Qian,Jianfeng?He,Zhi?Xing,Xun?Zhang.Pb isotope geochemistry of lead, zinc, gold and silver deposit clustered region, Liaodong rift zone,northeastern China[J].Science in China(Earth Sciences),2005,48(4):467-476. |
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| Authors: | Email author" target="_blank">Jiangfeng?ChenEmail author Gang?Yu Chunji?Xue Hui?Qian Jianfeng?He Zhi?Xing Xun?Zhang |
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| Institution: | 1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2. Department of Geology, Chang'an University, Xi'an 710054, China |
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| 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 206Pb/204Pb, 15.59 to 17.05 for 207Pb/204Pb and 37.43 to 38.63 for 208Pb/204Pb. 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 206Pb/204Pb=17.66-17.96, 207Pb/204Pb=15.60-15.74 and 208Pb/204Pb=37.94-38.60. In contrast, ore Pb from the Beiwagou deposit gives different Pb isotopic ratios with 206Pb/204Pb=15.68-15.81, 207Pb/204Pb= 15.34-15.45 and 208Pb/204Pb=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. |
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| Keywords: | Pb isotopes source(s) of the ore-forming materials origin of ore deposits Liaodong rift zone |
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