Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran
During the early Ediacaran, there was a large influx of phosphorus into the oceans and a resultant high phosphorus concentration in seawater, where multicellular eukaryotes may have been the primary type of marine productivity. The eukaryotes could play a critical role in regulating Zn cycling and i...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | http://ir.gig.ac.cn/handle/344008/39941 https://doi.org/10.1029/2018JC014068 |
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ftchacadscgigcas:oai:ir.gig.ac.cn:344008/39941 2023-05-15T18:25:44+02:00 Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran Fan, Haifeng Wen, Hanjie Xiao, Chaoyi Zhou, Ting Cloquet, Christophe Zhu, Xiangkun 2018-08-01 http://ir.gig.ac.cn/handle/344008/39941 https://doi.org/10.1029/2018JC014068 英语 eng AMER GEOPHYSICAL UNION JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS http://ir.gig.ac.cn/handle/344008/39941 doi:10.1029/2018JC014068 Oceanography zinc geochemical cycling Zn isotopes phosphorus-rich ocean early Ediacaran south China ZN ISOTOPIC FRACTIONATION DOUSHANTUO FORMATION SNOWBALL EARTH TRACE-ELEMENTS SOUTHERN-OCEAN MASS-BALANCE EVOLUTION PHOSPHATE CONSTRAINTS CU 期刊论文 2018 ftchacadscgigcas https://doi.org/10.1029/2018JC014068 2020-12-22T07:21:34Z During the early Ediacaran, there was a large influx of phosphorus into the oceans and a resultant high phosphorus concentration in seawater, where multicellular eukaryotes may have been the primary type of marine productivity. The eukaryotes could play a critical role in regulating Zn cycling and isotopes. To establish Zn geochemical cycling patterns in the phosphorus-rich ocean, this study investigates Zn isotopic signatures of shallow water phosphorite that contains phosphatized microfossils (Weng'an biota) and deep-water shale from the Doushantuo Formation. Our results indicate that phosphorite commonly preserves heavier Zn isotope composition, with an average of 0.80. The positive Zn-66 values in phosphorites may be ascribed to Zn isotope fractionation associated with the complexation of Zn with phosphate and the adsorption of isotopically heavy Zn onto Fe-Mn oxides and organism's surfaces. We argue that phosphorite may represent an important sink of isotopically heavy Zn in a phosphorus-rich ocean during Earth history. Meanwhile, deep-water organic-rich shale shows an enrichment of isotopically light Zn with an average of 0.23, which may be attributed to sulfide precipitation in mid-depth environment. The organic-rich shale may represent an isotopically light Zn sink. In addition, the highest Zn-66 value (0.45) in a euxinic black shale may indicate that Zn isotope signal of anoxic deep water is similar to that of modern deep seawater. If that is the case, it suggests that Zn geochemical cycling in the early Ediacaran oceans was similar to that of modern oceans. Report Southern Ocean Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) Southern Ocean Journal of Geophysical Research: Oceans 123 8 5248 5260 |
institution |
Open Polar |
collection |
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscgigcas |
language |
English |
topic |
Oceanography zinc geochemical cycling Zn isotopes phosphorus-rich ocean early Ediacaran south China ZN ISOTOPIC FRACTIONATION DOUSHANTUO FORMATION SNOWBALL EARTH TRACE-ELEMENTS SOUTHERN-OCEAN MASS-BALANCE EVOLUTION PHOSPHATE CONSTRAINTS CU |
spellingShingle |
Oceanography zinc geochemical cycling Zn isotopes phosphorus-rich ocean early Ediacaran south China ZN ISOTOPIC FRACTIONATION DOUSHANTUO FORMATION SNOWBALL EARTH TRACE-ELEMENTS SOUTHERN-OCEAN MASS-BALANCE EVOLUTION PHOSPHATE CONSTRAINTS CU Fan, Haifeng Wen, Hanjie Xiao, Chaoyi Zhou, Ting Cloquet, Christophe Zhu, Xiangkun Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran |
topic_facet |
Oceanography zinc geochemical cycling Zn isotopes phosphorus-rich ocean early Ediacaran south China ZN ISOTOPIC FRACTIONATION DOUSHANTUO FORMATION SNOWBALL EARTH TRACE-ELEMENTS SOUTHERN-OCEAN MASS-BALANCE EVOLUTION PHOSPHATE CONSTRAINTS CU |
description |
During the early Ediacaran, there was a large influx of phosphorus into the oceans and a resultant high phosphorus concentration in seawater, where multicellular eukaryotes may have been the primary type of marine productivity. The eukaryotes could play a critical role in regulating Zn cycling and isotopes. To establish Zn geochemical cycling patterns in the phosphorus-rich ocean, this study investigates Zn isotopic signatures of shallow water phosphorite that contains phosphatized microfossils (Weng'an biota) and deep-water shale from the Doushantuo Formation. Our results indicate that phosphorite commonly preserves heavier Zn isotope composition, with an average of 0.80. The positive Zn-66 values in phosphorites may be ascribed to Zn isotope fractionation associated with the complexation of Zn with phosphate and the adsorption of isotopically heavy Zn onto Fe-Mn oxides and organism's surfaces. We argue that phosphorite may represent an important sink of isotopically heavy Zn in a phosphorus-rich ocean during Earth history. Meanwhile, deep-water organic-rich shale shows an enrichment of isotopically light Zn with an average of 0.23, which may be attributed to sulfide precipitation in mid-depth environment. The organic-rich shale may represent an isotopically light Zn sink. In addition, the highest Zn-66 value (0.45) in a euxinic black shale may indicate that Zn isotope signal of anoxic deep water is similar to that of modern deep seawater. If that is the case, it suggests that Zn geochemical cycling in the early Ediacaran oceans was similar to that of modern oceans. |
format |
Report |
author |
Fan, Haifeng Wen, Hanjie Xiao, Chaoyi Zhou, Ting Cloquet, Christophe Zhu, Xiangkun |
author_facet |
Fan, Haifeng Wen, Hanjie Xiao, Chaoyi Zhou, Ting Cloquet, Christophe Zhu, Xiangkun |
author_sort |
Fan, Haifeng |
title |
Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran |
title_short |
Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran |
title_full |
Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran |
title_fullStr |
Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran |
title_full_unstemmed |
Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran |
title_sort |
zinc geochemical cycling in a phosphorus-rich ocean during the early ediacaran |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2018 |
url |
http://ir.gig.ac.cn/handle/344008/39941 https://doi.org/10.1029/2018JC014068 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS http://ir.gig.ac.cn/handle/344008/39941 doi:10.1029/2018JC014068 |
op_doi |
https://doi.org/10.1029/2018JC014068 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
8 |
container_start_page |
5248 |
op_container_end_page |
5260 |
_version_ |
1766207374707654656 |