NDLI: Isotope tracers for deep-seated fluids and noble gases

Content Provider	Springer Nature Link
Author	Wang, Baode Niu, Shuyin Sun, Aiqun Zhang, Jianzhen Wang, Xiang Wang, Chuen
Copyright Year	2013
Abstract	The role of He and Ar isotopes in tracing the source of ore fluids has aroused great attention of the broad masses of the geological researchers. On the basis of lots of test and measurement of He and Ar isotopes in sulfides from Au, Ag polymetallic ore deposits in northern China, statistics has been made on the published He and Ar isotope data from 27 gold deposits, 13 silver polymetallic ore deposits, 8 polymetallic ore deposits, 1 rare-earth deposit, 3 oceanic incrustations, 3 volcanic springs and their wall rocks and granites. The statistical results indicate that the $^{3}$He/$^{4}$Ar (×10$^{−6}$) values of the Au, Ag polymetallic ore deposits are within the range of 0.24–9.39, with an average of 3.34×10$^{−6}$; the He/Ar values, 0.007–6.01,with an average of 2.37; the $^{40}$Ar/$^{36}$Ar values, 265.75–2361, with an average of 699.0; the $^{4}$He/$^{40}$Ar values, 0.0020–643.86, with an average of 5.85, the $^{3}$He/$^{4}$Ar (×10$^{−6}$) values of gneiss and granite surrounding the mining area, 0.001–1.79, with an average of 1.00×10$^{−6}$, reflecting great differences in source. Mantle-source He in 48 Au, Ag polymetallic ore deposits accounts for 4.55%–83.06%, averaging 29.91%. It falls near the mantle-source region which can be seen in the He isotopic concentration diagram and the $^{3}$He/$^{4}$He(R/Ra)-$^{40}$Ar/$^{36}$Ar plot. Studies suggested that the ore-forming materials for endogenic Au, Ag polymetallic ore deposits should be derived from the deep interior of the Earth, and with the multi-stage evolution of mantle plumes the deep-seated ore fluids would be transported from the deep interior of the Earth to the shallow levels. During this process the mixing of crust/mantle-source fluids would inevitably occur, therefore, the value range always lies between the mantle and the crust.
Starting Page	195
Ending Page	202
Page Count	8
File Format	PDF
ISSN	10009426
Journal	Chinese Journal of Geochemistry
Volume Number	32
Issue Number	2
e-ISSN	19930364
Language	English
Publisher	SP Science Press
Publisher Date	2013-04-19
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Au, Ag polymetallic ore deposit He and Ar isotope tracing ore-forming materials from the deep interior of the Earth mantle plume Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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