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Opendata, web and dolomites

STROMATA SIGNED

Micro-pyrites associated with organic material in ancient stromatolites: a new proxy attesting for their biogenicity

Total Cost €

EC-Contrib. €

Partnership

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Outcomes and
results

STROMATA project word cloud

Explore the words cloud of the STROMATA project. It provides you a very rough idea of what is the project "STROMATA" about.

found criteria time original record recorded small abiotic life geological emblematic scientific nano submicrometer morphological outstanding interpreted stable reflecting xanes structures ancient nanosims biological shown isotope first laminated isotopic determined sulfate proposes stromatolites earliest point fossils miss identifying contain question archean experiment metabolic bigger assessing techniques fossil accretionary proxies pyrites actual away ga experimentally stromata precipitation tem variations quest composition history respiration reaching morphology sulfides feg biogenicity microbially influence samples structure traces compare sedimentary mats biosphere experimental initiation attached earth sims microbial situ metabolisms prevail form origin combining stromatolite modern pyrite iron

Project "STROMATA" data sheet

The following table provides information about the project.

Coordinator	UNIVERSITE JEAN MONNET SAINT-ETIENNE Organization address address: RUE TREFILERIE 10 city: SAINT ETIENNE postcode: 42023 website: www.portail.univ-st-etienne.fr contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.
Coordinator Country	France [FR]
Total cost	1˙060˙250 €
EC max contribution	1˙060˙250 € (100%)
Programme	1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
Code Call	ERC-2017-STG
Funding Scheme	ERC-STG
Starting year	2018
Duration (year-month-day)	from 2018-02-01 to 2023-01-31

Partnership

Take a look of project's partnership.

#	participants	country	role	EC contrib. [€]
1	UNIVERSITE JEAN MONNET SAINT-ETIENNE UNIVERSITE JEAN MONNET SAINT-ETIENNE Organization address address: RUE TREFILERIE 10 city: SAINT ETIENNE postcode: 42023 website: www.portail.univ-st-etienne.fr contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.	FR (SAINT ETIENNE)	coordinator	1˙060˙250.00

Map

Project objective

Identifying Archean fossil remains from the Earth’s early biosphere is ambitious and determining the biological origin and the associated metabolic pathways present in these fossils is one outstanding question in the bigger quest of how life evolved on Earth. Stromatolites and Microbially Induced Sedimentary Structures (MISS) are considered as one of the earliest evidence of Life in Earth’s history, and can be found from the Archean to the present time. Stromatolites are “attached laminated, sedimentary growth structure accretionary away from a point of initiation”, and their morphological comparison with actual structure prevail for assessing the microbial origin of ancient stromatolite in the geological record. However, experimental studies have shown that abiotic precipitation can also form structures with a similar morphology. Therefore stable isotope proxies have been used to identify past microbial metabolisms even if abiotic processes can also produce similar isotope composition. Therefore new biogenicity criteria are needed to be determined by studying modern and ancient stromatolites and by comparing them to abiotic experiment. Stromatolites and MISS contain submicrometer sulfides (pyrite) that can have recorded large isotopic variations, interpreted as reflecting the influence of various microbial metabolisms like microbial sulfate reduction and iron respiration. STROMATA proposes to define new criteria based on actual stromatolite and to test the earliest traces of life by studying in situ these nano-pyrites in various emblematic and well-characterized samples from the Archean. STROMATA will be the first far-reaching scientific in situ study of nano-pyrite in ancient (3.4 to 1.9 Ga) and modern microbial mats and stromatolites and will compare the results with experimentally produced abiotic pyrite. Due to the small scale of the pyrite, STROMATA will develop an original in situ approach by combining state of art techniques, SIMS, NanoSIMS, FEG-TEM, XANES.

Publications

List of publications.
year	authors and title	journal	last update
2020	Johanna Marinâ€Carbonne, Vincent Busigny, Jennyfer Miot, Claire Rollionâ€Bard, Elodie Muller, Nadja Drabon, Damien Jacob, Sylvain Pont, Martin Robyr, Tomaso R. R. Bontognali, Camille FranÃ§ois, Stephanie Reynaud, Mark Van Zuilen, Pascal Philippot In Situ Fe and S isotope analyses in pyrite from the 3.2Â Ga Mendon Formation (Barberton Greenstone Belt, South Africa): Evidence for early microbial iron reduction published pages: , ISSN: 1472-4677, DOI: 10.1111/gbi.12385	Geobiology	2020-03-11

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