Helium and argon isotopic geochemistry of Jinding superlarge Pb-Zn deposit |
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| Authors: | Ruizhong Hu G Turner P G Burnard Hong Zhong Zaojun Ye Xianwu Bi |
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| Institution: | (1) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Department of Earth Sciences, University of Manchester, M13 9PL Manchester, UK |
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| Abstract: | The study results of He and Ar isotopes from fluid inclusions in pyrites formed during mineralization stage of Jinding superlarge
Pb-Zn deposit in west Yunnan, China are reported. The data show that the40Ar/36Ar and3He/4He ratios of fluid inclusions are respectively in the range of 301. 7–385. 7 and 0. 03–0.06Ra, suggesting the oreforming fluid
is a kind of air saturated meteoric groundwater. On the basis of research on coupled relationships among He, Ar, S and Pb
isotopes, the evolution history of ore-forming fluid of the deposit can be summarized as (i) air saturated meteogenic groundwater
infiltrated down and was heated→ (ii) leached S, C and radiogenic He, Ar from the basinal strata → (iii) leached Pb and Zn
from mantle-derived igneous rocks located in the bottom of the basin→ (iv) ore-forming fluid ascended and formed the deposit.
Due to this process, the isotope signatures of crustal radiogenic He, atmospheric Ar (with partial radiogenic40Ar), crustal S and mantle-derived Pb remained in the ore-forming fluid.
Project supported by A30 Project of the National Climbing Program of China and University of Manchester. |
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| Keywords: | Jinding superlarge Pb-Zn deposit fluid inclusion ore-forming fluid He and Ar isotope air saturated meteoric water |
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