Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence
Sediments at marine cold seep areas provide potential archives of past fluid flow, which allow insights into the evolution of past methane seepage activities. However, signals for anaerobic oxidation of methane (AOM) might be obscured in bulk sediments in cold-seep settings due to several factors, e...
Published in: | International Journal of Environmental Research and Public Health |
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ftpubmed:oai:pubmedcentral.nih.gov:6650871 2023-05-15T18:01:12+02:00 Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence Wu, Daidai Sun, Tiantian Xie, Rui Pan, Mengdi Chen, Xuegang Ye, Ying Liu, Lihua Wu, Nengyou 2019-06-28 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6650871/ http://www.ncbi.nlm.nih.gov/pubmed/31261753 https://doi.org/10.3390/ijerph16132299 en eng MDPI http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6650871/ http://www.ncbi.nlm.nih.gov/pubmed/31261753 http://dx.doi.org/10.3390/ijerph16132299 © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). CC-BY Article Text 2019 ftpubmed https://doi.org/10.3390/ijerph16132299 2019-08-18T00:17:45Z Sediments at marine cold seep areas provide potential archives of past fluid flow, which allow insights into the evolution of past methane seepage activities. However, signals for anaerobic oxidation of methane (AOM) might be obscured in bulk sediments in cold-seep settings due to several factors, especially flood and turbidite deposition. Comprehensive inorganic data were gathered in this study to explore the availability of related records at cold seeps and to provide insights into the evolution of past methane seepage activities. Sediments collected from the site 973-4 in the Taixinan Basin on the northern slope of the South China Sea were characterized in terms of total carbon and sulfur, δ(13)C values of total organic carbon (δ(13)C(TIC)), δ(34)S values of chromium reducible sulfur (δ(34)S(CRS)), and foraminiferal oxygen and carbon isotopes. The results confirmed a strong correlation between formation of authigenic minerals and AOM. Moreover, the (34)S enrichments and abundant chromium reducible sulfur (CRS) contents in the authigenic sulfides in the sulfate–methane transition zone (SMTZ) within 619–900 cm below seafloor (cmbsf) reflected past high methane fluxes supported by constant methane seepages. Lithological distribution and AMS (Accelerator Mass Spectra) (14)C dating of planktonic foraminifera show that the turbidite (~35.14 ka) was related to a foraminifera-rich interval (Unit II: 440-619 cmbsf) and increased carbonate productivity during the last glacial maximum (LGM). Enrichment of Mo and U was observed accompanied by low contents of nutrient metals (Al, Ti, V, Ni, Fe, Mn, and Cu) in Unit II. The foraminifera-rich interval (Unit II) of cold seep sediments was probably linked to the phenomenon of inconsecutive sedimentary sequence due to the turbidites, which resulted in the lack of Fe, Mn, and Ba enrichment. There is no U enrichment but only Mo enrichment within Unit III, which might be related to H(2)S produced by AOM during the methane seepages. Based on the above results, it can be speculated ... Text Planktonic foraminifera PubMed Central (PMC) International Journal of Environmental Research and Public Health 16 13 2299 |
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Article Wu, Daidai Sun, Tiantian Xie, Rui Pan, Mengdi Chen, Xuegang Ye, Ying Liu, Lihua Wu, Nengyou Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence |
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Sediments at marine cold seep areas provide potential archives of past fluid flow, which allow insights into the evolution of past methane seepage activities. However, signals for anaerobic oxidation of methane (AOM) might be obscured in bulk sediments in cold-seep settings due to several factors, especially flood and turbidite deposition. Comprehensive inorganic data were gathered in this study to explore the availability of related records at cold seeps and to provide insights into the evolution of past methane seepage activities. Sediments collected from the site 973-4 in the Taixinan Basin on the northern slope of the South China Sea were characterized in terms of total carbon and sulfur, δ(13)C values of total organic carbon (δ(13)C(TIC)), δ(34)S values of chromium reducible sulfur (δ(34)S(CRS)), and foraminiferal oxygen and carbon isotopes. The results confirmed a strong correlation between formation of authigenic minerals and AOM. Moreover, the (34)S enrichments and abundant chromium reducible sulfur (CRS) contents in the authigenic sulfides in the sulfate–methane transition zone (SMTZ) within 619–900 cm below seafloor (cmbsf) reflected past high methane fluxes supported by constant methane seepages. Lithological distribution and AMS (Accelerator Mass Spectra) (14)C dating of planktonic foraminifera show that the turbidite (~35.14 ka) was related to a foraminifera-rich interval (Unit II: 440-619 cmbsf) and increased carbonate productivity during the last glacial maximum (LGM). Enrichment of Mo and U was observed accompanied by low contents of nutrient metals (Al, Ti, V, Ni, Fe, Mn, and Cu) in Unit II. The foraminifera-rich interval (Unit II) of cold seep sediments was probably linked to the phenomenon of inconsecutive sedimentary sequence due to the turbidites, which resulted in the lack of Fe, Mn, and Ba enrichment. There is no U enrichment but only Mo enrichment within Unit III, which might be related to H(2)S produced by AOM during the methane seepages. Based on the above results, it can be speculated ... |
format |
Text |
author |
Wu, Daidai Sun, Tiantian Xie, Rui Pan, Mengdi Chen, Xuegang Ye, Ying Liu, Lihua Wu, Nengyou |
author_facet |
Wu, Daidai Sun, Tiantian Xie, Rui Pan, Mengdi Chen, Xuegang Ye, Ying Liu, Lihua Wu, Nengyou |
author_sort |
Wu, Daidai |
title |
Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence |
title_short |
Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence |
title_full |
Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence |
title_fullStr |
Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence |
title_full_unstemmed |
Characteristics of Authigenic Minerals around the Sulfate-Methane Transition Zone in the Methane-Rich Sediments of the Northern South China Sea: Inorganic Geochemical Evidence |
title_sort |
characteristics of authigenic minerals around the sulfate-methane transition zone in the methane-rich sediments of the northern south china sea: inorganic geochemical evidence |
publisher |
MDPI |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6650871/ http://www.ncbi.nlm.nih.gov/pubmed/31261753 https://doi.org/10.3390/ijerph16132299 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6650871/ http://www.ncbi.nlm.nih.gov/pubmed/31261753 http://dx.doi.org/10.3390/ijerph16132299 |
op_rights |
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
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CC-BY |
op_doi |
https://doi.org/10.3390/ijerph16132299 |
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International Journal of Environmental Research and Public Health |
container_volume |
16 |
container_issue |
13 |
container_start_page |
2299 |
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1766170577111875584 |