کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11024700 | 1701088 | 2018 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ge and Si isotope signatures in rivers: A quantitative multi-proxy approach
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
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چکیده انگلیسی
Dissolved δ74Ge composition of rivers studied thus far range from 0.9 to 5.5â° with a discharge-weighted global average of 2.6 ± 0.5â°. The Ge isotope composition of riverine suspended and bedload sediments is indistinguishable from silicate source rocks, which is consistent with mass balance expectations. The multi-proxy modeling suggests that, among the watersheds studied here, the isotopic fractionation of Si during secondary mineral phase precipitation (Î30Sisec) ranges from â2.7 to â0.2â°, which removes between 19-79% of the initial dissolved Si, while between 12-54% is incorporated by biota. For Ge, modeling indicates that 79-98% of the dissolved load is incorporated into secondary mineral phases with a Î74Gesec ranging from â4.9 to â0.3â°. The fractionation induced by biological uptake is calculated to range from â2.6 to â1.3â° for Î30Sibio and â0.7 ± 0.7â° for Î74Gebio. In addition to improving our understanding of the coupled Ge and Si cycles, our study provides a framework for using multiple isotopic tracers to elucidate the chemical behavior of solutes in natural waters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 503, 1 December 2018, Pages 194-215
Journal: Earth and Planetary Science Letters - Volume 503, 1 December 2018, Pages 194-215
نویسندگان
J. Jotautas Baronas, Mark A. Torres, A. Joshua West, Olivier Rouxel, Bastian Georg, Julien Bouchez, Jérôme Gaillardet, Douglas E. Hammond,