Geochemistry of the Cambrian Sirius Passet Lagerstatte, Northern Greenland

International audience The lower Cambrian Sirius Passet Lagerstatte (approximate to 518 Ma) consists of mudstones about 8 m thick located in the Franklinian Basin of North Greenland. We analyzed major and trace elements plus the S, C, Cu, Fe, Zn, and Mo isotope compositions. Factor analysis allowed...

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Bibliographic Details
Published in:Geochemistry, Geophysics, Geosystems
Main Authors: Albarede, Francis, Le Boudec, Ange, Ineson, Jon, Rosing, Minik, Dossing, Lasse, Martineau, Francois, Lecuyer, Christophe
Other Authors: Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2014
Subjects:
Cambrian
sedimentary geochemistry
[SDU]Sciences of the Universe [physics]
Greenland
Sirius
North Greenland
Online Access:https://univ-lyon1.hal.science/hal-02350699
https://univ-lyon1.hal.science/hal-02350699/document
https://univ-lyon1.hal.science/hal-02350699/file/Geochem%20Geophys%20Geosyst%20-%202014%20-%20Boudec%20-%20Geochemistry%20of%20the%20Cambrian%20Sirius%20Passet%20Lagerst%20tte%20Northern%20Greenland.pdf
https://doi.org/10.1002/2013GC005068
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Summary:International audience The lower Cambrian Sirius Passet Lagerstatte (approximate to 518 Ma) consists of mudstones about 8 m thick located in the Franklinian Basin of North Greenland. We analyzed major and trace elements plus the S, C, Cu, Fe, Zn, and Mo isotope compositions. Factor analysis allowed the lithology of the mudstone to be broken down into variable proportions of two inputs, a dry felsic component and a hydrous mafic component (smectite or chlorite). Zircons U-Pb ages indicate multiple sources, the local Proterozoic basement of Northern Greenland (1250-2400 Ma) and Pan-African felsic magmas (620-650 Ma) from across the Iapetus ocean. Diagenesis involved the reduction of Fe, S, and Mo from seawater and pyritization. The Sirius Passet Lagerstatte formed in oxygen-starved muds inhibiting degradation of organic matter underneath a well-ventilated water column. The chemistry of the samples, their very fine grain size, their apparent lack of graded bedding, and the age of zircons suggest that the Lagerstatte may represent wind-blown dust deposited on the continental slope.

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