The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum
The cause of massive blooms of Ethmodiscus rex laminated diatom mats (LDMs) in the eastern Philippine Sea (EPS) during the Last Glacial Maximum (LGM) remains uncertain. In order to better understand the mechanism of formation of E. rex LDMs from the perspective of dissolved silicon (DSi) utilization...
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/50104 2023-05-15T13:40:37+02:00 The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum Xiong, Zhifang Li, Tiegang Algeo, Thomas Doering, Kristin Frank, Martin Brzezinski, Mark A. Chang, Fengming Opfergelt, Sophie Crosta, Xavier Jiang, Fuqing Wan, Shiming Zhai, Bin 2015-07-01 http://ir.qdio.ac.cn/handle/337002/50104 https://doi.org/10.1002/2015PA002793 英语 eng PALEOCEANOGRAPHY Xiong, Zhifang,Li, Tiegang,Algeo, Thomas,et al. The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum[J]. PALEOCEANOGRAPHY,2015,30(7):803-823. http://ir.qdio.ac.cn/handle/337002/50104 doi:10.1002/2015PA002793 Article 期刊论文 2015 ftchinacasciocas https://doi.org/10.1002/2015PA002793 2022-06-27T05:37:20Z The cause of massive blooms of Ethmodiscus rex laminated diatom mats (LDMs) in the eastern Philippine Sea (EPS) during the Last Glacial Maximum (LGM) remains uncertain. In order to better understand the mechanism of formation of E. rex LDMs from the perspective of dissolved silicon (DSi) utilization, we determined the silicon isotopic composition of single E. rex diatom frustules (delta Si-30(E.rex)) from two sediment cores in the Parece Vela Basin of the EPS. In the study cores, delta Si-30(E.rex) varies from -1.23 parts per thousand to -0.83 parts per thousand (average -1.04 parts per thousand), a range that is atypical of marine diatom delta Si-30 and that corresponds to the lower limit of reported diatom delta Si-30 values of any age. A binary mixing model (upwelled silicon versus eolian silicon) accounting for silicon isotopic fractionation during DSi uptake by diatoms was constructed. The binary mixing model demonstrates that E. rex dominantly utilized DSi from eolian sources (i.e., Asian dust) with only minor contributions from upwelled seawater sources (i.e., advected from Subantarctic Mode Water, Antarctic Intermediate Water, or North Pacific Intermediate Water). E. rex utilized only similar to 24% of available DSi, indicating that surface waters of the EPS were eutrophic with respect to silicon during the LGM. Our results suggest that giant diatoms did not always use a buoyancy strategy to obtain nutrients from the deep nutrient pool, thus revising previously proposed models for the formation of E. rex LDMs. Article in Journal/Newspaper Antarc* Antarctic Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Antarctic Pacific Paleoceanography 30 7 803 823 |
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Open Polar |
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Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
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ftchinacasciocas |
language |
English |
description |
The cause of massive blooms of Ethmodiscus rex laminated diatom mats (LDMs) in the eastern Philippine Sea (EPS) during the Last Glacial Maximum (LGM) remains uncertain. In order to better understand the mechanism of formation of E. rex LDMs from the perspective of dissolved silicon (DSi) utilization, we determined the silicon isotopic composition of single E. rex diatom frustules (delta Si-30(E.rex)) from two sediment cores in the Parece Vela Basin of the EPS. In the study cores, delta Si-30(E.rex) varies from -1.23 parts per thousand to -0.83 parts per thousand (average -1.04 parts per thousand), a range that is atypical of marine diatom delta Si-30 and that corresponds to the lower limit of reported diatom delta Si-30 values of any age. A binary mixing model (upwelled silicon versus eolian silicon) accounting for silicon isotopic fractionation during DSi uptake by diatoms was constructed. The binary mixing model demonstrates that E. rex dominantly utilized DSi from eolian sources (i.e., Asian dust) with only minor contributions from upwelled seawater sources (i.e., advected from Subantarctic Mode Water, Antarctic Intermediate Water, or North Pacific Intermediate Water). E. rex utilized only similar to 24% of available DSi, indicating that surface waters of the EPS were eutrophic with respect to silicon during the LGM. Our results suggest that giant diatoms did not always use a buoyancy strategy to obtain nutrients from the deep nutrient pool, thus revising previously proposed models for the formation of E. rex LDMs. |
format |
Article in Journal/Newspaper |
author |
Xiong, Zhifang Li, Tiegang Algeo, Thomas Doering, Kristin Frank, Martin Brzezinski, Mark A. Chang, Fengming Opfergelt, Sophie Crosta, Xavier Jiang, Fuqing Wan, Shiming Zhai, Bin |
spellingShingle |
Xiong, Zhifang Li, Tiegang Algeo, Thomas Doering, Kristin Frank, Martin Brzezinski, Mark A. Chang, Fengming Opfergelt, Sophie Crosta, Xavier Jiang, Fuqing Wan, Shiming Zhai, Bin The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum |
author_facet |
Xiong, Zhifang Li, Tiegang Algeo, Thomas Doering, Kristin Frank, Martin Brzezinski, Mark A. Chang, Fengming Opfergelt, Sophie Crosta, Xavier Jiang, Fuqing Wan, Shiming Zhai, Bin |
author_sort |
Xiong, Zhifang |
title |
The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum |
title_short |
The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum |
title_full |
The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum |
title_fullStr |
The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum |
title_full_unstemmed |
The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum |
title_sort |
silicon isotope composition of ethmodiscus rex laminated diatom mats from the tropical west pacific: implications for silicate cycling during the last glacial maximum |
publishDate |
2015 |
url |
http://ir.qdio.ac.cn/handle/337002/50104 https://doi.org/10.1002/2015PA002793 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
PALEOCEANOGRAPHY Xiong, Zhifang,Li, Tiegang,Algeo, Thomas,et al. The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum[J]. PALEOCEANOGRAPHY,2015,30(7):803-823. http://ir.qdio.ac.cn/handle/337002/50104 doi:10.1002/2015PA002793 |
op_doi |
https://doi.org/10.1002/2015PA002793 |
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Paleoceanography |
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30 |
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7 |
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803 |
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823 |
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1766137538846654464 |