کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6430930 1634850 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Silicon isotope homogeneity in the mantle
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Silicon isotope homogeneity in the mantle
چکیده انگلیسی

Thirty-five mafic and ultramafic rocks have been analysed for their silicon isotopic composition to very high precision with the aim of providing a robust average value for the silicate earth. This is of importance to studies using the difference between meteorite and terrestrial isotope composition to quantify silicon sequestration during core formation and, also, for understanding crustal processes. The δ30Si values of the samples are more limited than previously reported, ranging between just − 0.39 and − 0.23‰ despite significant variations in chemical and other isotopic compositions. A hint of a trend exists between δ30Si and both SiO2 and Al2O3, which can be explained by concentration of the heavier isotopes in the melt as a function of silica polymerisation. Our best estimate for the δ30Si of the bulk silicate earth (BSE) is − 0.29 ± 0.08‰ (2 s.d.).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 295, Issues 1–2, 15 June 2010, Pages 139-146
نویسندگان
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