Large Zn isotope variations in the Ni-Mo polymetallic sulfide layer in the lower Cambrian, South China
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000012" target="_blank" >RIV/00025798:_____/20:00000012 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/abs/pii/S1342937X2030157X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S1342937X2030157X?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.gr.2020.04.009" target="_blank" >10.1016/j.gr.2020.04.009</a>
Alternative languages
Result language
angličtina
Original language name
Large Zn isotope variations in the Ni-Mo polymetallic sulfide layer in the lower Cambrian, South China
Original language description
In South China, black organic-rich shales in the lower Cambrian Niutitang Formation host a Ni-Mo polymetallic sulfide layer that discontinuously extends over ~1600 km. Seawater and hydrothermal origins are among the many suggested hypotheses and are still under debate. In order to discriminate Zn sources, we report Zn isotopes in Ni-Mo polymetallic sulfide layers and their host shales from the Nayong and Zunyi locations in Guizhou province and the Zhangjiajie section in Hunan province. In each section, host organic-rich shales show homogeneous Zn isotope compositions which likely resulted from quantitative scavenging of dissolved Zn from seawater under euxinic conditions. The difference in the average delta66Zn values of organic-rich shales between the two sections in Guizhou (0.76 ± 0.09per mille) and one section in Hunan (0.59 ± 0.10per mille)might reflect variations of Zn isotope gradient with the depth of seawater. Therefore, the organic-rich sediments need not always represent an isotopically light Zn sink, which is dependent on Zn isotope fractionation in the local basin. However, the delta66Zn values in the Ni-Mo polymetallic sulfide layers are different from those of their host shales, indicating that these sulfide layers did not inherit the Zn isotope signal of seawater. Based on the regular increasing trend in delta66Zn values from Nayong (0.54 ± 0.06per mille) to Zhangjiajie (1.34 ± 0.09per mille) and the presence of Pb-Zn mineralization in the Dengying/Doushantuo Formations, we argue that hydrothermal fluids associated with Pb-Zn mineralization could be a major source of Zn in Ni-Mo sulfide layers, especially in the Nayong location. A possible model is that the hydrothermal fluids related to MVT-type mineralization got overprinted on a multiple-sourced synsedimentary sulfide-rich layer. We provide additional evidence that Zn isotopes have great potential as a tracer of metal source and can be applied to similar types of mineralization as e.g., the late Devonian Ni-Zn-PGE Nick deposit (Selwyn Basin, Canada) or elsewhere.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA17-15700S" target="_blank" >GA17-15700S: Black shale formations as geochemical markers of paleoenvironmental changes and tectonic setting along active continental margins</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Gondwana research
ISSN
1342-937X
e-ISSN
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Volume of the periodical
85
Issue of the periodical within the volume
September
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
13
Pages from-to
224-236
UT code for WoS article
000546704800012
EID of the result in the Scopus database
2-s2.0-85086726243