Geochemical controls on dispersion of U and Th in Quaternary deposits, stream water, and aquatic plants in an area with a granite pluton

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Fältnamn	Indikatorer	Metadata
000		04292naa a2200469 4500
001		oai:DiVA.org:lnu-80032
003		SwePub
008		190130s2019 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-800322 URI
024	7	a https://doi.org/10.1016/j.scitotenv.2019.01.2932 DOI
040		a (SwePub)lnu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Yu, Changxun,d 1983-u Linnéuniversitetet,Institutionen för biologi och miljö (BOM)4 aut0 (Swepub:lnu)chyuaa
245	1 0	a Geochemical controls on dispersion of U and Th in Quaternary deposits, stream water, and aquatic plants in an area with a granite pluton
264	1	b Elsevier,c 2019
338		a print2 rdacarrier
520		a The weathering of U and/or Th rich granite plutons, which occurs worldwide, may serve as a potentially important, but as yet poorly defined source for U and Th in (sub-)surface environments. Here, we assessed the impact of an outcrop of such granite (5 km in diameter) and its erosional products on the distribution of U and Th in four nemo-boreal catchments. The results showed that (i) the pluton was enriched in both U and Th; and (ii) secondary U and Th phases were accumulated by peat/gyttja and in other Quaternary deposits with high contents of organic matter. Movement of the ice sheet during the latest glaciation led to dispersal of U- and Th-rich materials eroded from the pluton, resulting in a progressive increase in dissolved U and Th concentrations, as well as U concentrations in aquatic plants with increasing proximity to the pluton. The accumulation of U in the aquatic plants growing upon the pluton (100–365 mg kg−1, dry ash weight) shows that this rock represents a long-term risk for adjacent ecosystems. Dissolved pools of U and Th were correlated with those of dissolved organic matter (DOM) and were predicted to largely occur as organic complexes. This demonstrates the importance of DOM in the transport of U and Th in the catchments. Large fractions of Ca2UO2(CO3)30(aq) were modeled to occur in the stream with highest pH and alkalinity and thus, explain the strongly elevated U concentrations and fluxes in this particular stream. In future climate scenarios, boreal catchments will experience intensified runoff and warmer temperature that favor the production of hydrologically accessible DOM and alkalinity. Therefore, the results obtained from this study have implications for predicting the distribution and transport of Th and U in boreal catchments, especially those associated with U and/or Th rich granite plutons.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Miljövetenskap0 (SwePub)105022 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Environmental Sciences0 (SwePub)105022 hsv//eng
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geokemi0 (SwePub)105062 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geochemistry0 (SwePub)105062 hsv//eng
653		a Uranium
653		a Thorium
653		a Nemo-boreal catchments
653		a Climate change
653		a Weathering
653		a Miljövetenskap
653		a Environmental Science
653		a Miljövetenskap
653		a Environmental Science
700	1	a Berger, Tobiasu Linnéuniversitetet,Institutionen för biologi och miljö (BOM),The Swedish Anglers Association, Sweden4 aut0 (Swepub:lnu)ebeto
700	1	a Drake, Henrik,d 1979-u Linnéuniversitetet,Institutionen för biologi och miljö (BOM)4 aut0 (Swepub:lnu)edrhe
700	1	a Song, Zhaoliangu Tianjin University, China4 aut
700	1	a Peltola, Pasiu Boliden Rönnskär, Sweden4 aut0 (Swepub:lnu)kpepa
700	1	a Åström, Mats E.,d 1963-u Linnéuniversitetet,Institutionen för biologi och miljö (BOM)4 aut0 (Swepub:lnu)kasma
710	2	a Linnéuniversitetetb Institutionen för biologi och miljö (BOM)4 org
773	0	t Science of the Total Environmentd : Elsevierg 663, s. 16-28q 663<16-28x 0048-9697x 1879-1026
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-80032
856	4 8	u https://doi.org/10.1016/j.scitotenv.2019.01.293

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