Contributions of U-Th-Pb dating on the diagenesis and sediment sources of the Lower Group (BI) of the Mbuji-Mayi Supergroup (Democratic Republic of Congo)

François, Camille; Kabamba Baludikay, Blaise; Storme; Baudet, Daniel; Paquette, JL; Fialin, M; Javaux, Emmanuelle

doi:10.1016/j.precamres.2017.06.012

Article (Scientific journals)

Contributions of U-Th-Pb dating on the diagenesis and sediment sources of the Lower Group (BI) of the Mbuji-Mayi Supergroup (Democratic Republic of Congo)

François, Camille; Kabamba Baludikay, Blaise; Storme et al.

2017 • In Precambrian Research

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https://hdl.handle.net/2268/212501

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10.1016/j.precamres.2017.06.012

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Keywords :

U-Pb dating; monazite & xenotime; Proterozoic organic-walled microfossils; Central Africa; LA-ICP-MS; Electron Microprobe

Abstract :

[en] In this paper, we present new age constraints for the lower part of the Meso-Neoproterozoic sedimentary Mbuji-Mayi Supergroup (Democratic Republic of Congo, DRC). This Supergroup preserves a large diversity of organic-walled microfossils, evidencing the diversification of early eukaryotes for the first time in Central Africa. We use different methods such as in situ U-Pb geochronology by LA-ICP-MS and U-Th-Pb chemical datings by Electron Microprobe on diagenetic and detrital minerals such as xenotimes, monazites and zircons. We attempt to better constrain the provenance of the Mbuji-Mayi sediments and the minimum age of the Mbuji-Mayi Supergroup to constrain the age of the microfossils. Results with LA-ICP-MS and EMP provide new ages between 1030 and 1065 Ma for the diagenesis of the lower part of the sedimentary sequence. These results are consistent with data on biostratigraphy supporting the occurrence of worldwide changes at the Mesoproterozoic/Neoproterozoic boundary.

Disciplines :

Earth sciences & physical geography

Author, co-author :

François, Camille ; Université de Liège > Département de géologie > Paléobiogéologie - Paléobotanique - Paléopalynologie (PPP)

Kabamba Baludikay, Blaise ; Université de Liège > Département de géologie > Paléobiogéologie - Paléobotanique - Paléopalynologie (PPP)

Storme

Baudet, Daniel; MRAC

Paquette, JL

Fialin, M

Javaux, Emmanuelle ; Université de Liège > Département de géologie > Paléobiogéologie - Paléobotanique - Paléopalynologie (PPP)

Language :

English

Title :

Contributions of U-Th-Pb dating on the diagenesis and sediment sources of the Lower Group (BI) of the Mbuji-Mayi Supergroup (Democratic Republic of Congo)

Publication date :

15 June 2017

Journal title :

Precambrian Research

ISSN :

0301-9268

Publisher :

Elsevier Science, Amsterdam, Netherlands

Peer reviewed :

Peer Reviewed verified by ORBi

European Projects :

FP7 - 308074 - ELITE - Early Life Traces, Evolution, and Implications for Astrobiology

Funders :

ERC stg ELITE
Belspo PAI PlaNet Topers
CE - Commission Européenne

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