华南埃迪卡拉纪晚期深水相氮循环过程重建

叶凯云; 赵坤; 童霞; 李松倬; 郎咸国

doi:10.3799/dqkx.2023.116

Volume 49 Issue 9

Sep. 2024

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Article Navigation > Earth Science > 2024 > 49(9): 3212-3227

Ye Kaiyun, Zhao Kun, Tong Xia, Li Songzhuo, Lang Xianguo, 2024. Reconstruction of Deep-Water Nitrogen Cycle during the Late Ediacaran in South China. Earth Science, 49(9): 3212-3227. doi: 10.3799/dqkx.2023.116

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Ye Kaiyun, Zhao Kun, Tong Xia, Li Songzhuo, Lang Xianguo, 2024. Reconstruction of Deep-Water Nitrogen Cycle during the Late Ediacaran in South China. Earth Science, 49(9): 3212-3227. doi: 10.3799/dqkx.2023.116

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Reconstruction of Deep-Water Nitrogen Cycle during the Late Ediacaran in South China

doi: 10.3799/dqkx.2023.116

Ye Kaiyun^{1
,
,},
Zhao Kun¹,
Tong Xia¹,
Li Songzhuo^{1, 2},
Lang Xianguo^{1
,
,}

1.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
2.
Chengdu Exploration and Development Research Institute of PetroChina Daqing Oilfield Co., Ltd., Chengdu 610051, China

Received Date: 2023-02-07
Available Online: 2024-10-16
Publish Date: 2024-09-25

Abstract

Abstract

The reconstruction of the paleo-ocean nitrogen cycle in geological history is helpful to understanding the REDOX state of the ocean at that time, whereas the study of the Late Ediacaran marine nitrogen cycle is relatively insufficient. Here we report detailed nitrogen isotope (δ¹⁵N) and organic carbon isotopic compositions (δ¹³C_org) from the Silikou section in northern Guangxi and the Shangdiping section in southeastern Guizhou Province. The results show that the average values of δ¹⁵N from the Silikou section and Shangdiping section are (1.6±2.0)‰ and (3.5±1.1)‰, respectively, both of which show a gradual decrease from old to new. The mean δ¹³C_org values of the two sections are (-30.0±1.4)‰ and (-30.6±1.4)‰, respectively. The relatively high δ¹⁵N values indicate that there was an aerobic nitrogen cycle coupled with nitrification and denitrification, and there was a stable marine nitrate reservoir in the Late Ediacaran. The gradual decrease from old to new in δ¹⁵N may result from the expansion of deep water anoxia in which denitrification and anammox can consume a large amount of NO₃^‒ and stimulate nitrogen fixation. Thus, the expansion of deep anoxic water column at the end of the Ediacaran may have exacerbated the extinction of the Ediacaran biota at ~542 Ma.
- nitrogen isotope,
- Late Ediacaran,
- deep water facies,
- South China,
- geochemistry,
- stratigraphy

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References(48)

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Reconstruction of Deep-Water Nitrogen Cycle during the Late Ediacaran in South China

doi: 10.3799/dqkx.2023.116

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