Multiproxy characterization of sedimentary facies in a submarine sulphide mine tailings dumping site and their environmental significance : The study case of Portmán Bay (SE Spain)
Copyright © 2021 The Authors. Published by Elsevier B.V. All rights reserved..
Mining activities are essential to our society, but ore extraction and treatment produce waste that must be stored in safe places without harm to the environment. For a long time, seafloor disposal has been viewed as a cheap option with barely visible impacts. In Portmán Bay, SE of Spain, large amounts of tailings from open pit sulphide mining were discharged directly into the coastal sea over 33 years, thus forming a massive deposit that completely infilled the bay and expanded seawards over the inner continental shelf. Here we present the first multiproxy physicochemical characterization of the submarine tailings in Portmán Bay, mostly by using non-destructive techniques, also including pre-dumping and post-dumping sediments. Eight distinct sedimentary facies, grouped in four stratigraphic units, have been thus identified in a set of up to 4.3 m long gravity cores totalling more than 60 m. Geogenic and anthropogenic geochemical proxies consistently allow differentiating pre-dumping sediments from tailings. Potentially toxic metals if made bioavailable can reach high concentrations in units including or formed exclusively by tailings (i.e. up to 3455, 2755 and 1007 mg kg-1 for Pb, As, and Zn, respectively). Some physical properties, such as magnetic susceptibility, are particularly useful as the tailings are rich in Fe-bearing minerals (>30% Fe in some layers). Estimated sedimentation rates show a strong gradient from proximal to distal locations, with rates in excess of 50 cm yr-1 to less than 1 cm yr-1. We ultimately document the history of the transformation of Portmán Bay from an almost natural state to a new condition after a long period of massive dumping of mine tailings. Our study provides guidance to further assessments in a context where the diversity of marine environments impacted by the disposal of mine waste is expected to grow in the near future.
| Medienart: |
E-Artikel |
|---|
| Erscheinungsjahr: |
2022 |
|---|---|
| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:810 |
|---|---|
| Enthalten in: |
The Science of the total environment - 810(2022) vom: 01. März, Seite 151183 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Baza-Varas, Andrea [VerfasserIn] |
|---|
| Links: |
|---|
| Themen: |
Chemical-physical properties |
|---|
| Anmerkungen: |
Date Completed 20.01.2022 Date Revised 20.01.2022 published: Print-Electronic Citation Status MEDLINE |
|---|
| doi: |
10.1016/j.scitotenv.2021.151183 |
|---|
| funding: |
|
|---|---|
| Förderinstitution / Projekttitel: |
|
| PPN (Katalog-ID): |
NLM332535258 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | NLM332535258 | ||
| 003 | DE-627 | ||
| 005 | 20231225215753.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 231225s2022 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1016/j.scitotenv.2021.151183 |2 doi | |
| 028 | 5 | 2 | |a pubmed24n1108.xml |
| 035 | |a (DE-627)NLM332535258 | ||
| 035 | |a (NLM)34715228 | ||
| 035 | |a (PII)S0048-9697(21)06261-6 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Baza-Varas, Andrea |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Multiproxy characterization of sedimentary facies in a submarine sulphide mine tailings dumping site and their environmental significance |b The study case of Portmán Bay (SE Spain) |
| 264 | 1 | |c 2022 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 20.01.2022 | ||
| 500 | |a Date Revised 20.01.2022 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright © 2021 The Authors. Published by Elsevier B.V. All rights reserved. | ||
| 520 | |a Mining activities are essential to our society, but ore extraction and treatment produce waste that must be stored in safe places without harm to the environment. For a long time, seafloor disposal has been viewed as a cheap option with barely visible impacts. In Portmán Bay, SE of Spain, large amounts of tailings from open pit sulphide mining were discharged directly into the coastal sea over 33 years, thus forming a massive deposit that completely infilled the bay and expanded seawards over the inner continental shelf. Here we present the first multiproxy physicochemical characterization of the submarine tailings in Portmán Bay, mostly by using non-destructive techniques, also including pre-dumping and post-dumping sediments. Eight distinct sedimentary facies, grouped in four stratigraphic units, have been thus identified in a set of up to 4.3 m long gravity cores totalling more than 60 m. Geogenic and anthropogenic geochemical proxies consistently allow differentiating pre-dumping sediments from tailings. Potentially toxic metals if made bioavailable can reach high concentrations in units including or formed exclusively by tailings (i.e. up to 3455, 2755 and 1007 mg kg-1 for Pb, As, and Zn, respectively). Some physical properties, such as magnetic susceptibility, are particularly useful as the tailings are rich in Fe-bearing minerals (>30% Fe in some layers). Estimated sedimentation rates show a strong gradient from proximal to distal locations, with rates in excess of 50 cm yr-1 to less than 1 cm yr-1. We ultimately document the history of the transformation of Portmán Bay from an almost natural state to a new condition after a long period of massive dumping of mine tailings. Our study provides guidance to further assessments in a context where the diversity of marine environments impacted by the disposal of mine waste is expected to grow in the near future | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Chemical-physical properties | |
| 650 | 4 | |a Ecosystem impact | |
| 650 | 4 | |a Metal-rich deposit | |
| 650 | 4 | |a Mine waste | |
| 650 | 4 | |a Non-destructive sediment core analysis | |
| 650 | 4 | |a Shallow coastal sea | |
| 650 | 7 | |a Sulfides |2 NLM | |
| 650 | 7 | |a Water Pollutants, Chemical |2 NLM | |
| 700 | 1 | |a Canals, Miquel |e verfasserin |4 aut | |
| 700 | 1 | |a Frigola, Jaime |e verfasserin |4 aut | |
| 700 | 1 | |a Cerdà-Domènech, Marc |e verfasserin |4 aut | |
| 700 | 1 | |a Rodés, Nil |e verfasserin |4 aut | |
| 700 | 1 | |a Tarrés, Marta |e verfasserin |4 aut | |
| 700 | 1 | |a Sanchez-Vidal, Anna |e verfasserin |4 aut | |
| 700 | 0 | |a NUREIEVA-MAR1 shipboard party |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t The Science of the total environment |d 1972 |g 810(2022) vom: 01. März, Seite 151183 |w (DE-627)NLM000215562 |x 1879-1026 |7 nnns |
| 773 | 1 | 8 | |g volume:810 |g year:2022 |g day:01 |g month:03 |g pages:151183 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1016/j.scitotenv.2021.151183 |3 Volltext |
| 912 | |a GBV_USEFLAG_A | ||
| 912 | |a GBV_NLM | ||
| 951 | |a AR | ||
| 952 | |d 810 |j 2022 |b 01 |c 03 |h 151183 | ||