Revisit of rare earth element fractionation during chemical weathering and river sediment transport
Although rare earth element (REE) has been widely applied for provenance study and paleoenvironmental reconstruction, its mobility and fractionation during earth surface processes from weathering to sediment deposition remain more clarification. We investigated the REE fractionations during chemical...
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| creator | Su, Ni Yang, Shouye Guo, Yulong Yue, Wei Wang, Xiaodan Yin, Ping Huang, Xiangtong |
| description | Although rare earth element (REE) has been widely applied for provenance study and paleoenvironmental reconstruction, its mobility and fractionation during earth surface processes from weathering to sediment deposition remain more clarification. We investigated the REE fractionations during chemical weathering and river sediment transport based on the systematic observations from a granodiorite‐weathering profile and Mulanxi River sediments in southeast China. Two chemical phases (leachates and residues) were separated by 1 N HCl leaching and the leachates account for 20–70% of the bulk REE concentration. REEs in the weathering profile have been mobilized and fractionated to different extents during chemical weathering and pedogenesis. Remarkable cerium anomalies (Ce/Ce* = 0.1–10.6) occur during weathering as a result of coprecipitation with Mn (hydro)oxides in the profile, while poor or no Ce anomalies in the river sediments were observed. This contrasting feature sheds new light on the indication of Ce anomaly for redox change. The hydraulic sorting‐induced mineral redistribution can further homogenize the weathering and pedogenic alterations and thus weaken the REE fractionations in river sediments. The mineral assemblage is the ultimate control on REE composition, and the Mn‐Fe (hydro)oxides and secondary phosphate minerals are the main hosts of acid‐leachable REEs while the clay minerals could be important reservoirs for residual REEs. We thus suggest that the widely used REE proxies such as (LREE/HREE)UCC ratio in the residues is reliable for the indication of sediment provenance, while the ratio in the leachates can indicate the total weathering process to some extent.
Key Points
Remarkable REE fractionations occur during chemical weathering, but can be weakened by hydraulic sorting
Mineral assemblage controls the acid‐leachable and residual REE compositions of sediments
REE proxies such as (LREE/HREE)UCC and ∑REEUCC ratios can indicate weathering and sorting processes |
| doi_str_mv | 10.1002/2016GC006659 |
| format | Article |
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Key Points
Remarkable REE fractionations occur during chemical weathering, but can be weakened by hydraulic sorting
Mineral assemblage controls the acid‐leachable and residual REE compositions of sediments
REE proxies such as (LREE/HREE)UCC and ∑REEUCC ratios can indicate weathering and sorting processes</description><identifier>ISSN: 1525-2027</identifier><identifier>EISSN: 1525-2027</identifier><identifier>DOI: 10.1002/2016GC006659</identifier><language>eng</language><publisher>Washington: John Wiley & Sons, Inc</publisher><subject>Anomalies ; Cerium ; Chemical weathering ; Clay ; Clay minerals ; Composition ; Coprecipitation ; Earth ; Earth surface ; Fluvial sediments ; Fractionation ; Hosts ; hydraulic sorting ; Iron ; Leachates ; Leaching ; Manganese ; Mineral assemblages ; Minerals ; Oxides ; Oxidoreductions ; Phosphate minerals ; Phosphates ; Provenance ; Rare earth elements ; Ratios ; river ; River sediment transport ; River sediments ; Rivers ; Sediment ; Sediment transport ; Transport ; Weathering</subject><ispartof>Geochemistry, geophysics, geosystems : G3, 2017-03, Vol.18 (3), p.935-955</ispartof><rights>2017. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3732-a4dc77a21e2afe66f0e815dbc0d30a1c29ff3fa4cb0b608d0c1e006f16479e003</citedby><cites>FETCH-LOGICAL-a3732-a4dc77a21e2afe66f0e815dbc0d30a1c29ff3fa4cb0b608d0c1e006f16479e003</cites><orcidid>0000-0002-4810-6598</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2016GC006659$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2016GC006659$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>315,781,785,1418,11567,27929,27930,45579,45580,46057,46481</link.rule.ids><linktorsrc>$$Uhttps://onlinelibrary.wiley.com/doi/abs/10.1002%2F2016GC006659$$EView_record_in_Wiley-Blackwell$$FView_record_in_$$GWiley-Blackwell</linktorsrc></links><search><creatorcontrib>Su, Ni</creatorcontrib><creatorcontrib>Yang, Shouye</creatorcontrib><creatorcontrib>Guo, Yulong</creatorcontrib><creatorcontrib>Yue, Wei</creatorcontrib><creatorcontrib>Wang, Xiaodan</creatorcontrib><creatorcontrib>Yin, Ping</creatorcontrib><creatorcontrib>Huang, Xiangtong</creatorcontrib><title>Revisit of rare earth element fractionation during chemical weathering and river sediment transport</title><title>Geochemistry, geophysics, geosystems : G3</title><description>Although rare earth element (REE) has been widely applied for provenance study and paleoenvironmental reconstruction, its mobility and fractionation during earth surface processes from weathering to sediment deposition remain more clarification. We investigated the REE fractionations during chemical weathering and river sediment transport based on the systematic observations from a granodiorite‐weathering profile and Mulanxi River sediments in southeast China. Two chemical phases (leachates and residues) were separated by 1 N HCl leaching and the leachates account for 20–70% of the bulk REE concentration. REEs in the weathering profile have been mobilized and fractionated to different extents during chemical weathering and pedogenesis. Remarkable cerium anomalies (Ce/Ce* = 0.1–10.6) occur during weathering as a result of coprecipitation with Mn (hydro)oxides in the profile, while poor or no Ce anomalies in the river sediments were observed. This contrasting feature sheds new light on the indication of Ce anomaly for redox change. The hydraulic sorting‐induced mineral redistribution can further homogenize the weathering and pedogenic alterations and thus weaken the REE fractionations in river sediments. The mineral assemblage is the ultimate control on REE composition, and the Mn‐Fe (hydro)oxides and secondary phosphate minerals are the main hosts of acid‐leachable REEs while the clay minerals could be important reservoirs for residual REEs. We thus suggest that the widely used REE proxies such as (LREE/HREE)UCC ratio in the residues is reliable for the indication of sediment provenance, while the ratio in the leachates can indicate the total weathering process to some extent.
Key Points
Remarkable REE fractionations occur during chemical weathering, but can be weakened by hydraulic sorting
Mineral assemblage controls the acid‐leachable and residual REE compositions of sediments
REE proxies such as (LREE/HREE)UCC and ∑REEUCC ratios can indicate weathering and sorting processes</description><subject>Anomalies</subject><subject>Cerium</subject><subject>Chemical weathering</subject><subject>Clay</subject><subject>Clay minerals</subject><subject>Composition</subject><subject>Coprecipitation</subject><subject>Earth</subject><subject>Earth surface</subject><subject>Fluvial sediments</subject><subject>Fractionation</subject><subject>Hosts</subject><subject>hydraulic sorting</subject><subject>Iron</subject><subject>Leachates</subject><subject>Leaching</subject><subject>Manganese</subject><subject>Mineral assemblages</subject><subject>Minerals</subject><subject>Oxides</subject><subject>Oxidoreductions</subject><subject>Phosphate minerals</subject><subject>Phosphates</subject><subject>Provenance</subject><subject>Rare earth elements</subject><subject>Ratios</subject><subject>river</subject><subject>River sediment transport</subject><subject>River sediments</subject><subject>Rivers</subject><subject>Sediment</subject><subject>Sediment transport</subject><subject>Transport</subject><subject>Weathering</subject><issn>1525-2027</issn><issn>1525-2027</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp9kEFPwzAMhSMEEmNw4wdE4krBSdq0PaJpFKRJSAjOlZc6LFPXjiTbxL-n2zjsxMV-sj77yY-xWwEPAkA-ShC6mgBonZVnbCQymSUSZH5-oi_ZVQhLAJFmWTFi5p22LrjIe8s9euKEPi44tbSiLnLr0UTXd7gvvNl4131xs6CVM9jyHWFc0GGGXcO925LngRp32I0eu7DufbxmFxbbQDd_fcw-n6cfk5dk9la9Tp5mCapcyQTTxuQ5SkESLWltgQqRNXMDjQIURpbWKoupmcNcQ9GAETT8aoVO83JQaszujnfXvv_eUIj1st_4brCsRZnKQshCZQN1f6SM70PwZOu1dyv0P7WAeh9jfRrjgKsjvnMt_fzL1lVVTaWQWqpfi-p1Bg</recordid><startdate>201703</startdate><enddate>201703</enddate><creator>Su, Ni</creator><creator>Yang, Shouye</creator><creator>Guo, Yulong</creator><creator>Yue, Wei</creator><creator>Wang, Xiaodan</creator><creator>Yin, Ping</creator><creator>Huang, Xiangtong</creator><general>John Wiley & Sons, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0002-4810-6598</orcidid></search><sort><creationdate>201703</creationdate><title>Revisit of rare earth element fractionation during chemical weathering and river sediment transport</title><author>Su, Ni ; Yang, Shouye ; Guo, Yulong ; Yue, Wei ; Wang, Xiaodan ; Yin, Ping ; Huang, Xiangtong</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3732-a4dc77a21e2afe66f0e815dbc0d30a1c29ff3fa4cb0b608d0c1e006f16479e003</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Anomalies</topic><topic>Cerium</topic><topic>Chemical weathering</topic><topic>Clay</topic><topic>Clay minerals</topic><topic>Composition</topic><topic>Coprecipitation</topic><topic>Earth</topic><topic>Earth surface</topic><topic>Fluvial sediments</topic><topic>Fractionation</topic><topic>Hosts</topic><topic>hydraulic sorting</topic><topic>Iron</topic><topic>Leachates</topic><topic>Leaching</topic><topic>Manganese</topic><topic>Mineral assemblages</topic><topic>Minerals</topic><topic>Oxides</topic><topic>Oxidoreductions</topic><topic>Phosphate minerals</topic><topic>Phosphates</topic><topic>Provenance</topic><topic>Rare earth elements</topic><topic>Ratios</topic><topic>river</topic><topic>River sediment transport</topic><topic>River sediments</topic><topic>Rivers</topic><topic>Sediment</topic><topic>Sediment transport</topic><topic>Transport</topic><topic>Weathering</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Su, Ni</creatorcontrib><creatorcontrib>Yang, Shouye</creatorcontrib><creatorcontrib>Guo, Yulong</creatorcontrib><creatorcontrib>Yue, Wei</creatorcontrib><creatorcontrib>Wang, Xiaodan</creatorcontrib><creatorcontrib>Yin, Ping</creatorcontrib><creatorcontrib>Huang, Xiangtong</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Su, Ni</au><au>Yang, Shouye</au><au>Guo, Yulong</au><au>Yue, Wei</au><au>Wang, Xiaodan</au><au>Yin, Ping</au><au>Huang, Xiangtong</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Revisit of rare earth element fractionation during chemical weathering and river sediment transport</atitle><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle><date>2017-03</date><risdate>2017</risdate><volume>18</volume><issue>3</issue><spage>935</spage><epage>955</epage><pages>935-955</pages><issn>1525-2027</issn><eissn>1525-2027</eissn><abstract>Although rare earth element (REE) has been widely applied for provenance study and paleoenvironmental reconstruction, its mobility and fractionation during earth surface processes from weathering to sediment deposition remain more clarification. We investigated the REE fractionations during chemical weathering and river sediment transport based on the systematic observations from a granodiorite‐weathering profile and Mulanxi River sediments in southeast China. Two chemical phases (leachates and residues) were separated by 1 N HCl leaching and the leachates account for 20–70% of the bulk REE concentration. REEs in the weathering profile have been mobilized and fractionated to different extents during chemical weathering and pedogenesis. Remarkable cerium anomalies (Ce/Ce* = 0.1–10.6) occur during weathering as a result of coprecipitation with Mn (hydro)oxides in the profile, while poor or no Ce anomalies in the river sediments were observed. This contrasting feature sheds new light on the indication of Ce anomaly for redox change. The hydraulic sorting‐induced mineral redistribution can further homogenize the weathering and pedogenic alterations and thus weaken the REE fractionations in river sediments. The mineral assemblage is the ultimate control on REE composition, and the Mn‐Fe (hydro)oxides and secondary phosphate minerals are the main hosts of acid‐leachable REEs while the clay minerals could be important reservoirs for residual REEs. We thus suggest that the widely used REE proxies such as (LREE/HREE)UCC ratio in the residues is reliable for the indication of sediment provenance, while the ratio in the leachates can indicate the total weathering process to some extent.
Key Points
Remarkable REE fractionations occur during chemical weathering, but can be weakened by hydraulic sorting
Mineral assemblage controls the acid‐leachable and residual REE compositions of sediments
REE proxies such as (LREE/HREE)UCC and ∑REEUCC ratios can indicate weathering and sorting processes</abstract><cop>Washington</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/2016GC006659</doi><tpages>21</tpages><orcidid>https://orcid.org/0000-0002-4810-6598</orcidid></addata></record> |
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| ispartof | Geochemistry, geophysics, geosystems : G3, 2017-03, Vol.18 (3), p.935-955 |
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| subjects | Anomalies Cerium Chemical weathering Clay Clay minerals Composition Coprecipitation Earth Earth surface Fluvial sediments Fractionation Hosts hydraulic sorting Iron Leachates Leaching Manganese Mineral assemblages Minerals Oxides Oxidoreductions Phosphate minerals Phosphates Provenance Rare earth elements Ratios river River sediment transport River sediments Rivers Sediment Sediment transport Transport Weathering |
| title | Revisit of rare earth element fractionation during chemical weathering and river sediment transport |
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