کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910563 | 1637918 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Iron isotope pathways in the boreal landscape: Role of the riparian zone
ترجمه فارسی عنوان
مسیرهای ایزوتوپ آهن در منظره ساحلی: نقش منطقه ساحلی
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Stable Fe isotope compositions have been measured in water samples of the subarctic Kalix River, a first-order stream, and soil water samples from a riparian soil profile adjacent to the first-order stream (Northern Sweden). In the first-order stream, dominated by forest, both the particulate (>0.22â¯Âµm) and dissolved (<0.22â¯Âµm) phase showed negative δ56Fe values (relative to IRMM-014) during base flow and meltwater discharge in May (â0.97 to â0.09â°). The Fe isotope composition in the water from the riparian soil profile varied between â0.20 and +0.91â° with sharp gradients near the groundwater table. A linear correlation between the δ56Fe values and the TOC/Febulk ratio was measured during snowmelt in the unfiltered river waters (δ56Fe from â0.02 to +0.54â°), suggesting mixing of two Fe components. Two groups of Fe aggregates, with different Fe isotope compositions, are formed in the boreal landscape. We propose that carbon-rich aggregates, Fe(II)(III)-OC, have negative δ56Fe values and Fe-oxyhydroxides have positive δ56Fe values. A mixture of these two components can explain temporal variations of the Fe isotope composition in the Kalix River. This study suggests that stable Fe isotopes can be used as a tool to track and characterize suspended Fe-organic carbon aggregates during transport from the soil, via first-order streams and rivers, to coastal sediment. Furthermore, the differences in Fe isotope values in the Kalix River and the first-order stream during base flow conditions suggest that the primary Fe sources for river water change throughout the year. This model is combining the Fe isotope composition of first-order streams and rivers to weathering and transport processes in the riparian soil.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 239, 15 October 2018, Pages 49-60
Journal: Geochimica et Cosmochimica Acta - Volume 239, 15 October 2018, Pages 49-60
نویسندگان
Johan Ingri, Sarah Conrad, Fredrik Lidman, Fredrik Nordblad, Emma Engström, Ilia Rodushkin, Don Porcelli,