Universität zu Köln

Silantyev, S. A., Koepke, J., Ariskin, A. A., Anosova, M. O., Krasnova, E. A., Dubinina, E. O. and Suhr, G. (2014). Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5 degrees 10 ' S. Petrology, 22 (2). S. 109 - 128. MOSCOW: PLEIADES PUBLISHING INC. ISSN 1556-2085

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Abstract

Our newly obtained data on the geochemistry and age of plagiogranite-gabbronorite association in the oceanic core complex of the Mid-Atlantic Ridge (MAR) at 5A degrees 10'S suggest close genetic relations between these rocks in this segment of the ridge. The U/Pb zircon age of an oceanic plagiogranite (OPG) sample is 1.059 +/- 0.055 Ma and is in good agreement with the zircon age of plutonic rocks in the oceanic core complex of northern MAR. A distinctive geochemical feature of the rocks is their unusually depleted Sr-87/Sr-86 and Nd-143/Nd-144 ratios, which suggest that the plutonic rocks of the gabbronorite-plagiogranite association in MAR at 5A degrees 10'S could be derived from the most strongly depleted mantle reservoir of all known to occur beneath the axial MAR zone. The COMAGMAT-5.2 numerical thermodynamic simulation of the possible crystallization links between the plagiogranite and gabbronorite from the MAR segment at 5A degrees 10'S led us to conclude that the leading role in the origin of the plagiogranite was played by a two-stage process: the partial melting of the gabbronorite and the subsequent fractionation of the newly generated melt. The regional differences between the isotopic-geochemical parameters of MAR plagiogranites can, perhaps, reflect local specifics of so-called hydrothermal anatexis, such as the geochemical features of the rocks involved in this process and the parameters of the hydrothermal process, for example, variations in the W/R ratio.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Silantyev, S. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koepke, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ariskin, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Anosova, M. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krasnova, E. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dubinina, E. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Suhr, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-444857
DOI:	10.1134/S0869591114020064
Journal or Publication Title:	Petrology
Volume:	22
Number:	2
Page Range:	S. 109 - 128
Date:	2014
Publisher:	PLEIADES PUBLISHING INC
Place of Publication:	MOSCOW
ISSN:	1556-2085
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOUTH-ATLANTIC; CRUST; BASALTS; MORB; ND; SYSTEMATICS; ISOTOPES; ORIGIN Multiple languages Geochemistry & Geophysics; Mineralogy Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44485