Early Cambrian highly metalliferous black shale in South China: a multiisotope view of the stable isotopes of copper, zinc, cadmium, chromium, nickel, molybdenum, mercury and selenium

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000017" target="_blank" >RIV/00025798:_____/22:00000017 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s00126-022-01097-0" target="_blank" >https://doi.org/10.1007/s00126-022-01097-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00126-022-01097-0" target="_blank" >10.1007/s00126-022-01097-0</a>

Result language

angličtina

Original language name

Early Cambrian highly metalliferous black shale in South China: a multiisotope view of the stable isotopes of copper, zinc, cadmium, chromium, nickel, molybdenum, mercury and selenium

Original language description

Early Cambrian black shales on the Yangtze Platform host a regionallydistributed highly metalliferous sulfide-rich carbonaceous unit which hasbeen the subject of extensive debate. This unit with a few cm or 10s of cmthickness displays extreme enrichment in Mo and Ni (wtpercent range), and ina broad spectrum of other metals such as As, Au, PGEs, Re, Cu, Zn, Cd, Ag, Sb, Se, Tl and Hg, and occurs discontinuously along the westernpassive margin of the Yangtze Platform. It grades laterally instratigraphically equivalent m-thick V-rich shale and 10s-of-m-thicksapropelite (combustible shale). New Cu and Zn isotope data, combinedwith existing Cd, Cr, Ni, Mo, Hg and Se isotope and other data allow toattempt an integrated view on the formation of this intriguing unit ofhighly metalliferous black shale.The authigenic Cu enrichment in the 1000 ppm range has produced no or little Cu isotope fractionation beyond the lithogenic background. Heavy zinc and cadmium enrichment in the sulfidic samples (1.11  0.18 per mille delta66Zn, 0.31  0.10 per mille delta114Cd; n=9) is controlled by sulfide fractionation and contrasts with V-rich and barren shale (0.60  0.18 per mille delta66Zn, 0.00  0.14 per mille delta114Cd; n=13). The distinctly negative Ni isotope composition of the metalliferous unit can be interpreted as due to hydrothermal activity related to leaching of mafic rocks and their sulfides. Sorption processes(Fe-oxyhydroxides) and redox cycling in the water column plus microbial activity of methanogens could be an alternative interpretation. Metal enrichment can be understood as due to a process chain, from high biological productivity in the photic zone, to sulfate reduction and methanogenesis in the deeper water column and upper sediment layer. Key to the metal enrichment seems to be very low clastic sedimentation and advanced carbon destruction by anaerobic oxidation. Hydrothermal input along the rifted margin of the Yangtze Platform was very likely a part of this scenario.

Czech name

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Czech description

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Type

J_imp - 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

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)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Mineralium Deposita

ISSN

0026-4598

e-ISSN

—

Volume of the periodical

57

Issue of the periodical within the volume

7

Country of publishing house

DE - GERMANY

Number of pages

21

Pages from-to

1167–1187

UT code for WoS article

000752149900001

EID of the result in the Scopus database

2-s2.0-85124297881