کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9531854 | 1638791 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Andean subduction-related mantle xenoliths: Isotopic evidence of Sr-Nd decoupling during metasomatism
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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![عکس صفحه اول مقاله: Andean subduction-related mantle xenoliths: Isotopic evidence of Sr-Nd decoupling during metasomatism Andean subduction-related mantle xenoliths: Isotopic evidence of Sr-Nd decoupling during metasomatism](/preview/png/9531854.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Lithos - Volume 82, Issues 3â4, June 2005, Pages 273-287
Journal: Lithos - Volume 82, Issues 3â4, June 2005, Pages 273-287
نویسندگان
R.V. Conceição, G. Mallmann, E. Koester, M. Schilling, G.W. Bertotto, A. Rodriguez-Vargas,