کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10224326 | 1701095 | 2018 | 44 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of weathering and hydrothermal alteration on the REE and δ56Fe composition of iron formation, Cauê Formation, Iron Quadrangle, Brazil
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
The change in Fe isotopic composition with depth is more complex. In drill core from the OFS, negative δ56Fe values shift from â0.91â° at depth to less negative values of â0.6â° near the surface. The most altered samples do not lie on this trend because they are characterized by positive values of 0.30â° and 1.33â°. The δ56Fe values from the GS increase linearly from â0.11â° to 1.23â° towards the surface with the most negative values â0.7â° and â1.16â° near the top. The most negative values from the OFS could reflect synsedimentary microbial dissimilatory Fe reduction, and the positive values from the GS may be related to partial Fe2+ oxidation between the hydrothermal Fe source and Fe-(oxyhydr)oxides. However, when interpreted together with mineralogical and REE data, these data likely record the various alteration processes that affected the Cauê Iron Formation. Such findings highlight the importance of coupling sedimentologic analysis with elemental and isotopic chemistry to understand iron formation deposition and Fe ore-forming processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 497, 10 October 2018, Pages 27-40
Journal: Chemical Geology - Volume 497, 10 October 2018, Pages 27-40
نویسندگان
G.M.S. Sampaio, P.K. Pufahl, U. Raye, K.T. Kyser, A.T. Abreu, A.R. Alkmim, H.A. Jr,