Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weathering
We present rare earth element (REE) and Mo isotope data from the middle Gaoyuzhuang Formation in North China in order to contribute to the debate on the Mesoproterozoic marine redox state. Sequential leaching of the Gaoyuzhuang calcareous shales exhibits distinct enrichment patterns of trace metals...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Geosystems and Geoenvironment |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772883822001480 |
| _version_ | 1797851287273865216 |
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| author | Yuntao Ye Huajian Wang Xiaomei Wang Jie Li Chaodong Wu Shuichang Zhang |
| author_facet | Yuntao Ye Huajian Wang Xiaomei Wang Jie Li Chaodong Wu Shuichang Zhang |
| author_sort | Yuntao Ye |
| collection | DOAJ |
| description | We present rare earth element (REE) and Mo isotope data from the middle Gaoyuzhuang Formation in North China in order to contribute to the debate on the Mesoproterozoic marine redox state. Sequential leaching of the Gaoyuzhuang calcareous shales exhibits distinct enrichment patterns of trace metals between carbonate and authigenic phases, which are likely caused by element redistribution during organic matter degradation. Collectively, our results and literature data of the Gaoyuzhuang Formation show stratigraphically coupled variations in Ce anomalies and Mo stable isotope signatures. These geochemical shifts can be interpreted as a response to progressive oxygenation in regional and global settings, respectively. However, the oxygenation magnitudes expressed by Ce anomalies (Ce/Ce* = ∼0.8) and Mo isotopes (δ98Mo = 2.33‰) are markedly different. Rather than prevalent ocean oxygenation, we suggest that the modern-like seawater Mo isotope values represent accelerated input of reactive Fe from volcanism-induced weathering and subsequent burial of light Mo isotopes into the sediments. Furthermore, the documented transition coincides with the occurrence of macroscopic fossils, supporting a causal relationship between volcanism, environmental change, and biological evolution. |
| first_indexed | 2024-04-09T19:14:22Z |
| format | Article |
| id | doaj.art-2d11985dd6564fcc94cf13f6206c5fe2 |
| institution | Directory Open Access Journal |
| issn | 2772-8838 |
| language | English |
| last_indexed | 2024-04-09T19:14:22Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geosystems and Geoenvironment |
| spelling | doaj.art-2d11985dd6564fcc94cf13f6206c5fe22023-04-06T06:15:23ZengElsevierGeosystems and Geoenvironment2772-88382023-05-0122100173Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weatheringYuntao Ye0Huajian Wang1Xiaomei Wang2Jie Li3Chaodong Wu4Shuichang Zhang5Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China; Key Laboratory of Petroleum Geochemistry, Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, ChinaKey Laboratory of Petroleum Geochemistry, Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, ChinaKey Laboratory of Petroleum Geochemistry, Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, ChinaState Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, ChinaKey Laboratory of Petroleum Geochemistry, Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China; Corresponding author.We present rare earth element (REE) and Mo isotope data from the middle Gaoyuzhuang Formation in North China in order to contribute to the debate on the Mesoproterozoic marine redox state. Sequential leaching of the Gaoyuzhuang calcareous shales exhibits distinct enrichment patterns of trace metals between carbonate and authigenic phases, which are likely caused by element redistribution during organic matter degradation. Collectively, our results and literature data of the Gaoyuzhuang Formation show stratigraphically coupled variations in Ce anomalies and Mo stable isotope signatures. These geochemical shifts can be interpreted as a response to progressive oxygenation in regional and global settings, respectively. However, the oxygenation magnitudes expressed by Ce anomalies (Ce/Ce* = ∼0.8) and Mo isotopes (δ98Mo = 2.33‰) are markedly different. Rather than prevalent ocean oxygenation, we suggest that the modern-like seawater Mo isotope values represent accelerated input of reactive Fe from volcanism-induced weathering and subsequent burial of light Mo isotopes into the sediments. Furthermore, the documented transition coincides with the occurrence of macroscopic fossils, supporting a causal relationship between volcanism, environmental change, and biological evolution.http://www.sciencedirect.com/science/article/pii/S2772883822001480Sequential leachingCerium anomaliesMolybdenum isotopesGaoyuzhuang formationNorth China |
| spellingShingle | Yuntao Ye Huajian Wang Xiaomei Wang Jie Li Chaodong Wu Shuichang Zhang Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weathering Geosystems and Geoenvironment Sequential leaching Cerium anomalies Molybdenum isotopes Gaoyuzhuang formation North China |
| title | Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weathering |
| title_full | Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weathering |
| title_fullStr | Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weathering |
| title_full_unstemmed | Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weathering |
| title_short | Regional and global proxies for varying ocean redox conditions at ∼1.57 Ga: A causal connection with volcanism-induced weathering |
| title_sort | regional and global proxies for varying ocean redox conditions at ∼1 57 ga a causal connection with volcanism induced weathering |
| topic | Sequential leaching Cerium anomalies Molybdenum isotopes Gaoyuzhuang formation North China |
| url | http://www.sciencedirect.com/science/article/pii/S2772883822001480 |
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