Andean subduction-related mantle xenoliths: Isotopic evidence of Sr-Nd decoupling during metasomatism

Conceicao R.V., Mallmann G., Koester E., Schilling M., Bertotto G.W. and Rodriguez-Vargas A. (2005) Andean subduction-related mantle xenoliths: Isotopic evidence of Sr-Nd decoupling during metasomatism. Lithos, 82 3-4 SPEC. ISS.: 273-287. doi:10.1016/j.lithos.2004.09.022


Author Conceicao R.V.
Mallmann G.
Koester E.
Schilling M.
Bertotto G.W.
Rodriguez-Vargas A.
Title Andean subduction-related mantle xenoliths: Isotopic evidence of Sr-Nd decoupling during metasomatism
Journal name Lithos   Check publisher's open access policy
ISSN 0024-4937
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1016/j.lithos.2004.09.022
Volume 82
Issue 3-4 SPEC. ISS.
Start page 273
End page 287
Total pages 15
Language eng
Subject 1906 Geochemistry and Petrology
Abstract Sr-Nd isotopic analyses on some mantle xenolith samples from the Northern, Southern and Austral Andean volcanic zones exhibit radiogenic Sr enrichment without dramatic changing of the Nd isotopic composition. This anomalous effect (Sr-Nd decoupling) makes these samples plot displaced to the right side of the "mantle array" trend (here called the "MORB-OIB-BSE trend") in the 87Sr/ 86Sr vs. 143Nd/ 144Nd isotopic diagram. Such behavior reflects processes that took place in the mantle and can be related to: i) the mixture of a depleted mantle and an enriched source (enriched mantle II-EMII); ii) the mixture of a depleted mantle and a mixture of mantle-derived and slab-derived melts; and iii) a chromatographic process that occurs during the percolation of a metasomatic agent through the mantle.
Keyword Andes
Chromatography
Mantle
Metasomatism
Sr-Nd isotopes
Xenoliths
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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