Neodymium Isotope Geochemistry of a Subterranean Estuary

Rare earth elements (REE) and Nd isotope compositions of surface and groundwaters from the Indian River Lagoon in Florida were measured to investigate the influence of submarine groundwater discharge (SGD) on these parameters in coastal waters. The Nd flux of the terrestrial component of SGD is arou...

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Autores principales:	Darren A. Chevis, T. Jade Mohajerin, Ningfang Yang, Jaye E. Cable, E. Troy Rasbury, Sidney R. Hemming, David J. Burdige, Jonathan B. Martin, Christopher D. White, Karen H. Johannesson
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	neodymium isotopes submarine groundwater discharge Indian River Lagoon rare earth elements subterranean estuary Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/ec3c070ed4b24b4d9600d49aa0943524
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spelling	oai:doaj.org-article:ec3c070ed4b24b4d9600d49aa09435242021-11-10T08:34:33ZNeodymium Isotope Geochemistry of a Subterranean Estuary2624-937510.3389/frwa.2021.778344https://doaj.org/article/ec3c070ed4b24b4d9600d49aa09435242021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/frwa.2021.778344/fullhttps://doaj.org/toc/2624-9375Rare earth elements (REE) and Nd isotope compositions of surface and groundwaters from the Indian River Lagoon in Florida were measured to investigate the influence of submarine groundwater discharge (SGD) on these parameters in coastal waters. The Nd flux of the terrestrial component of SGD is around 0.7±0.03 μmol Nd/day per m of shoreline across the nearshore seepage face of the subterranean estuary. This translates to a terrestrial SGD Nd flux of 4±0.2 mmol/day for the entire 5,880 m long shoreline of the studied portion of the lagoon. The Nd flux from bioirrigation across the nearshore seepage face is 1±0.05 μmol Nd/day per m of shoreline, or 6±0.3 mmol/day for the entire shoreline. The combination of these two SGD fluxes is the same as the local, effective river water flux of Nd to the lagoon of 12.7±5.3 mmol/day. Using a similar approach, the marine-sourced SGD flux of Nd is 31.4±1.6 μmol Nd/day per m of shoreline, or 184±9.2 mmol/day for the investigated portion of the lagoon, which is 45 times higher than the terrestrial SGD Nd flux. Terrestrial-sourced SGD has an εNd(0) value of −5±0.42, which is similar to carbonate rocks (i.e., Ocala Limestone) from the Upper Floridan Aquifer (−5.6), but more radiogenic than the recirculated marine SGD, for which εNd(0) is −7±0.24. Marine SGD has a Nd isotope composition that is identical to the εNd(0) of Fe(III) oxide/oxyhydroxide coated sands of the surficial aquifer (−7.15±0.24 and −6.98±0.36). These secondary Fe(III) oxides/oxyhydroxides formed during subaerial weathering when sea level was substantially lower during the last glacial maximum. Subsequent flooding of these surficial sands by rising sea level followed by reductive dissolution of the Fe(III) oxide/oxyhydroxide coatings can explain the Nd isotope composition of the marine SGD component. Surficial waters of the Indian River Lagoon have an εNd(0) of −6.47±0.32, and are a mixture of terrestrial and marine SGD components, as well as the local rivers (−8.63 and −8.14). Nonetheless, the chief Nd source is marine SGD that has reacted with Fe(III) oxide/oxyhydroxide coatings on the surficial aquifer sands of the subterranean estuary.Darren A. ChevisT. Jade MohajerinNingfang YangJaye E. CableE. Troy RasburySidney R. HemmingDavid J. BurdigeJonathan B. MartinChristopher D. WhiteChristopher D. WhiteKaren H. JohannessonKaren H. JohannessonFrontiers Media S.A.articleneodymium isotopessubmarine groundwater dischargeIndian River Lagoonrare earth elementssubterranean estuaryEnvironmental technology. Sanitary engineeringTD1-1066ENFrontiers in Water, Vol 3 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	neodymium isotopes submarine groundwater discharge Indian River Lagoon rare earth elements subterranean estuary Environmental technology. Sanitary engineering TD1-1066
spellingShingle	neodymium isotopes submarine groundwater discharge Indian River Lagoon rare earth elements subterranean estuary Environmental technology. Sanitary engineering TD1-1066 Darren A. Chevis T. Jade Mohajerin Ningfang Yang Jaye E. Cable E. Troy Rasbury Sidney R. Hemming David J. Burdige Jonathan B. Martin Christopher D. White Christopher D. White Karen H. Johannesson Karen H. Johannesson Neodymium Isotope Geochemistry of a Subterranean Estuary
description	Rare earth elements (REE) and Nd isotope compositions of surface and groundwaters from the Indian River Lagoon in Florida were measured to investigate the influence of submarine groundwater discharge (SGD) on these parameters in coastal waters. The Nd flux of the terrestrial component of SGD is around 0.7±0.03 μmol Nd/day per m of shoreline across the nearshore seepage face of the subterranean estuary. This translates to a terrestrial SGD Nd flux of 4±0.2 mmol/day for the entire 5,880 m long shoreline of the studied portion of the lagoon. The Nd flux from bioirrigation across the nearshore seepage face is 1±0.05 μmol Nd/day per m of shoreline, or 6±0.3 mmol/day for the entire shoreline. The combination of these two SGD fluxes is the same as the local, effective river water flux of Nd to the lagoon of 12.7±5.3 mmol/day. Using a similar approach, the marine-sourced SGD flux of Nd is 31.4±1.6 μmol Nd/day per m of shoreline, or 184±9.2 mmol/day for the investigated portion of the lagoon, which is 45 times higher than the terrestrial SGD Nd flux. Terrestrial-sourced SGD has an εNd(0) value of −5±0.42, which is similar to carbonate rocks (i.e., Ocala Limestone) from the Upper Floridan Aquifer (−5.6), but more radiogenic than the recirculated marine SGD, for which εNd(0) is −7±0.24. Marine SGD has a Nd isotope composition that is identical to the εNd(0) of Fe(III) oxide/oxyhydroxide coated sands of the surficial aquifer (−7.15±0.24 and −6.98±0.36). These secondary Fe(III) oxides/oxyhydroxides formed during subaerial weathering when sea level was substantially lower during the last glacial maximum. Subsequent flooding of these surficial sands by rising sea level followed by reductive dissolution of the Fe(III) oxide/oxyhydroxide coatings can explain the Nd isotope composition of the marine SGD component. Surficial waters of the Indian River Lagoon have an εNd(0) of −6.47±0.32, and are a mixture of terrestrial and marine SGD components, as well as the local rivers (−8.63 and −8.14). Nonetheless, the chief Nd source is marine SGD that has reacted with Fe(III) oxide/oxyhydroxide coatings on the surficial aquifer sands of the subterranean estuary.
format	article
author	Darren A. Chevis T. Jade Mohajerin Ningfang Yang Jaye E. Cable E. Troy Rasbury Sidney R. Hemming David J. Burdige Jonathan B. Martin Christopher D. White Christopher D. White Karen H. Johannesson Karen H. Johannesson
author_facet	Darren A. Chevis T. Jade Mohajerin Ningfang Yang Jaye E. Cable E. Troy Rasbury Sidney R. Hemming David J. Burdige Jonathan B. Martin Christopher D. White Christopher D. White Karen H. Johannesson Karen H. Johannesson
author_sort	Darren A. Chevis
title	Neodymium Isotope Geochemistry of a Subterranean Estuary
title_short	Neodymium Isotope Geochemistry of a Subterranean Estuary
title_full	Neodymium Isotope Geochemistry of a Subterranean Estuary
title_fullStr	Neodymium Isotope Geochemistry of a Subterranean Estuary
title_full_unstemmed	Neodymium Isotope Geochemistry of a Subterranean Estuary
title_sort	neodymium isotope geochemistry of a subterranean estuary
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/ec3c070ed4b24b4d9600d49aa0943524
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Neodymium Isotope Geochemistry of a Subterranean Estuary

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