کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4701067 | 1637742 | 2007 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fe-oxide fracture fillings as a palæo-redox indicator: Structure, crystal form and Fe isotope composition
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Fe-oxide fracture fillings as a palæo-redox indicator: Structure, crystal form and Fe isotope composition Fe-oxide fracture fillings as a palæo-redox indicator: Structure, crystal form and Fe isotope composition](/preview/png/4701067.png)
چکیده انگلیسی
Fe isotope composition of the Fe-oxides was determined by multiple-collector inductively coupled plasma mass spectrometry using a 58Fe-54Fe double-spike. δ56Fe of the Fe-oxides ranges from â 0.8 to + 0.8â° (relative to the IRMM-14 standard). Hydrothermal samples have intermediate δ56Fe (â 0.3 to 0.0â°), whereas natural low-temperature samples may be isotopically lighter (â 0.8 to 0.0â°), and samples precipitated from drilling activity are isotopically heavier (â 0.2 to 0.8â°). Within the three genetic suites, δ56Fe correlates with the relative proportion of Fe(III). For the hydrothermal samples, Fe isotope composition likely reflects input of partially dissolved chlorite. The Fe isotope composition and Fe redox state of the low-temperature and drill-induced samples is consistent with a conceptual model where Fe isotope fractionation occurs during dissolution and oxidation. In our study, the deepest sample showing evidence of natural low-temperature oxidation, putatively as a result of penetration of oxidising surface waters during deglaciation, is from a depth of â¼Â 100 m.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 244, Issues 1â2, 30 September 2007, Pages 330-343
Journal: Chemical Geology - Volume 244, Issues 1â2, 30 September 2007, Pages 330-343
نویسندگان
K. Dideriksen, B.C. Christiansen, J.A. Baker, C. Frandsen, T. Balic-Zunic, E. Tullborg, S. Mørup, S.L.S. Stipp,