کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9530274 1353019 2005 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Authigenic uranium: Relationship to oxygen penetration depth and organic carbon rain
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Authigenic uranium: Relationship to oxygen penetration depth and organic carbon rain
چکیده انگلیسی
We have measured U in benthic incubation chambers, sediment pore waters, and in sediments along the California continental margin. Sedimentary U uptake rates, based on a combination of sediment pore water profiles and benthic incubation chambers, generally agree with those predicted from sediment accumulation rate data. This agreement supports the view that most of the continental margin sedimentary U is delivered by diffusion across the seawater-sediment boundary. The average rate of authigenic U accumulation for all the sites examined here is ∼−0.2 nmol cm-2 y-1, which is consistent with published global estimates of sedimentary U uptake. In addition, the accumulation rate of U in sediments exhibits a nonlinear relationship with the oxygen penetration depth and a linear relationship with the organic carbon rain rate. These relationships highlight the potential utility for the U accumulation rate as a proxy for these processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 69, Issue 1, 1 January 2005, Pages 95-108
نویسندگان
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