Geochemical signature of basalts of the MAR Rift Valley at 20°31′ n: origin conditions of the anomalous volcanic center of Puy des Folles in the axial zone of the Mid-Atlantic Ridge
- Authors: Silantyev S.A.1, Buikin A.I.1, Gurenko A.A.2, Chugaev A.V.3, Shabykova V.V.1, Tshovrebova A.R.1, Beltenev V.E.4, Bich A.S.4
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Affiliations:
- Vernadsky Institute of RAS
- Université de Lorraine
- Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of RAS
- VNIIOkeangeologia
- Issue: Vol 69, No 11 (2024)
- Pages: 962-974
- Section: Articles
- URL: https://journals.rcsi.science/0016-7525/article/view/277703
- DOI: https://doi.org/10.31857/S0016752524110017
- EDN: https://elibrary.ru/IFASOF
- ID: 277703
Cite item
Abstract
The results of study of chilled glasses sampled during 45-th cruise of R/V “Professor Logachev” at the top of the submarine volcano Puy-des-Folles are presented. Puy-des-Folles Volcano is located in the axial part of Rift Valley of the Mid-Atlantic Ridge (MAR) at 20°31′N.Unlike typical volcanic axial highs which usually does n ot exceed several hundred meters the summit of the Puy-des-Folles volcano is located a depth of 1950 m and rises 1800 meters above the bottom of the Rift Valley. The data on geochemistry and isotope composition of chilled glasses examined allow to come to a number of conclusions that expanded existing ideas about magmatic and rectjnic processes conducted in the Rift Valley of the Slow Spreading Ridges. Chilled glasses sampled at the top of the Puy-des-Folles volcano are originated from a very depleted melt formed by partial melting of the DM reservoir. Puy-des-Folles volcano was formed as result of trhe activity of a long-lived magma chamber located below the Rift Valley axis. It is possible that in addition to the DM reservoir mantle source enriched in incompatible elements may have participated in the formation of the parenatl melts for studied chilled glasses.Weak geoichemical signal of contamination of perental melt with a hydrothermal component in chilled glasses was established. Signs of staganation in the spreading of the oceanic crust in the Rift Valley segment studied in thic work have been established.
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About the authors
S. A. Silantyev
Vernadsky Institute of RAS
Author for correspondence.
Email: silantyev@geokhi.ru
Russian Federation, Kosygin st., 19, Moscow, 119991
A. I. Buikin
Vernadsky Institute of RAS
Email: silantyev@geokhi.ru
Russian Federation, Kosygin st., 19, Moscow, 119991
A. A. Gurenko
Université de Lorraine
Email: silantyev@geokhi.ru
Centre de Recherches Petrographiques et Geochimiques, UMR 7358
France, 54501 Vandoeuvre-les-NancyA. V. Chugaev
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of RAS
Email: silantyev@geokhi.ru
Russian Federation, Staromonetny per., 35, Moscow, 119017
V. V. Shabykova
Vernadsky Institute of RAS
Email: silantyev@geokhi.ru
Russian Federation, Kosygin st., 19, Moscow, 119991
A. R. Tshovrebova
Vernadsky Institute of RAS
Email: silantyev@geokhi.ru
Russian Federation, Kosygin st., 19, Moscow, 119991
V. E. Beltenev
VNIIOkeangeologia
Email: silantyev@geokhi.ru
Russian Federation, Angliiskii pt., 1, Saint Petersburg, 190121
A. S. Bich
VNIIOkeangeologia
Email: silantyev@geokhi.ru
Russian Federation, Angliiskii pt., 1, Saint Petersburg, 190121
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