Occurrence and characterization of tremolite asbestos from the Mid Atlantic Ridge

Type Article
Date 2021-12
Language English
Author(s) Di Giuseppe Dario1, 2, Perchiazzi Natale3, Brunelli Daniele1, 4, Giovanardi Tommaso1, Nodari Luca5, Della Ventura Giancarlo6, 7, Malferrari Daniele1, Maia Marcia8, Gualtieri Alessandro F.1
Affiliation(s) 1 : Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Modena, Italy
2 : Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, Reggio Emilia, Italy
3 : Department of Earth Sciences, University of Pisa, Pisa, Italy
4 : CNR-ISMAR Institute for Marine Sciences, Italian National Research Council, Bologna, Italy
5 : CNR-ICMATE Institute of Condensed Matter Chemistry and Technologies for Energy, Italian National Research Council, Padua, Italy
6 : Department of Sciences, University of Roma Tre, Rome, Italy
7 : INFN Laboratori Nazionali di Frascati, Frascati (Rome), Italy
8 : CNRS- Géosciences Océan UMR 6538 - Institut Universitaire Européen de la Mer, Plouzané, France
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2021-12 , Vol. 11 , N. 1 , P. 6285 (12p.)
DOI 10.1038/s41598-021-85576-w

Tremolite is one of the most common amphibole species and, in the fibrous form (i.e., characterized by crystals/particles consisting of fibres with length > 5 µm, width < 3 µm and aspect ratio > 3), one of the six asbestos minerals. Until now the attention of crystallographers has focused only on samples from continental environment. Here we report the first chemical and structural data of a tremolite asbestos found along the Mid Atlantic Ridge (MAR) at the eastern intersection of the Romanche Transform Fault (Equatorial MAR). Tremolite is associated with chlorite and lizardite and was formed through the green shale facies lower than zeolite in a predominantly fluid system. MAR tremolite asbestos shows very slight deviations from the ideal crystal structure of tremolite. Differences in cation site partitioning were found with respect to tremolite asbestos from ophiolitic complexes, attributed to the different chemical–physical conditions during the mineral formation. In particular, oceanic tremolite asbestos is enriched in Al and Na, forming a trend clearly distinct from the continental tremolites.

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Di Giuseppe Dario, Perchiazzi Natale, Brunelli Daniele, Giovanardi Tommaso, Nodari Luca, Della Ventura Giancarlo, Malferrari Daniele, Maia Marcia, Gualtieri Alessandro F. (2021). Occurrence and characterization of tremolite asbestos from the Mid Atlantic Ridge. Scientific Reports, 11(1), 6285 (12p.). Publisher's official version : https://doi.org/10.1038/s41598-021-85576-w , Open Access version : https://archimer.ifremer.fr/doc/00685/79703/