Petrogenetic conditions at 18°–20° N MAR: Interaction between hydrothermal and magmatic systems
- Authors: Silantyev S.A.1, Bortnikov N.S.2, Shatagin K.N.2, Bel’tenev V.E.3, Kononkova N.N.1, Bychkova Y.V.2, Krasnova E.A.1
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Affiliations:
- Vernadsky Institute of Geochemistry and Analytical Chemistry
- Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
- Polar Marine Geological Exploration Expedition
- Issue: Vol 24, No 4 (2016)
- Pages: 336-366
- Section: Article
- URL: https://journals.rcsi.science/0869-5911/article/view/177459
- DOI: https://doi.org/10.1134/S0869591116040044
- ID: 177459
Cite item
Abstract
The paper presents petrological and geochemical data on mantle peridotite, basalt, and metamorphic rocks sampled in Cruise 36 of the R/V Professor Logachev at the MAR axial zone between 17° and 20° N. These data are interesting not only as providing new information on the inner structure of the oceanic crust in the still-poorly known axial MAR segment but also in the context of the fundamental problem of interaction between magmatic and hydrothermal systems in slow-spreading mid-oceanic ridges. The MAR axial zone between 17° and 20° N was determined to host both weakly and strongly depleted residual peridodites, which suggests that the degree of mantle source melting significantly varied along the ridge axis in this segment. The MAR crest zone comprises slabs of serpentinized peridotite brought to the seafloor surface at various time. The most strongly depleted mantle peridotites likely uplifted later than the mildly and weakly depleted rocks in the same areas. A mantle reservoir beneath the MAR axial zone at 20° N is not isotopically related to the mantle source of the parental MORB melts, and high-Mg metabasites exposed at 17°56- N were derived from a crustal source that was modified near the root zone of a high-temperature hydrothermal system. The studied area seems to display traces of an extinct hydrothermal field and likely an ore occurrence related to it.
About the authors
S. A. Silantyev
Vernadsky Institute of Geochemistry and Analytical Chemistry
Author for correspondence.
Email: silantyev@geokhi.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991
N. S. Bortnikov
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: silantyev@geokhi.ru
Russian Federation, Staromonetnyi per. 35, Moscow, 109017
K. N. Shatagin
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: silantyev@geokhi.ru
Russian Federation, Staromonetnyi per. 35, Moscow, 109017
V. E. Bel’tenev
Polar Marine Geological Exploration Expedition
Email: silantyev@geokhi.ru
Russian Federation, ul. Pobedy 24, Lomonosov, 189510
N. N. Kononkova
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: silantyev@geokhi.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991
Ya. V. Bychkova
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: silantyev@geokhi.ru
Russian Federation, Staromonetnyi per. 35, Moscow, 109017
E. A. Krasnova
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: silantyev@geokhi.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991