利用氮硫同位素联用重建氧化还原景观鄂尔多斯盆地(华北)延长地层中-晚三叠世昌七层组案例研究

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-08-12 DOI:10.1029/2024GC011656
Xubin Wang, Lin Dong, Tong Li, Kun Ling, Changhu Zhang, Yijie Bin, Ziyi Wang, Zhijun Jin, Jinhua Fu
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引用次数: 0

摘要

缺氧是一种重要的地质条件,通常意味着地球历史上因缺氧而导致的更严重的物种灭绝事件。尽管在古氧化还原研究中对各种代用指标进行了广泛探索,但大多数代用指标主要用于重建大气中的 pO2、缺氧水相对于整个盆地的比例以及氧化还原状态的更广泛趋势。然而,很少有证据能够精确划分封闭区域内的局部缺氧状态。为了弥补这一空白并深入了解底栖生物缺氧的时空范围,我们建议利用总氮同位素(δ15NTN)和黄铁矿硫同位素(δ34Spy)进行协同分析。我们的研究重点是华北鄂尔多斯盆地延长地层三叠系长七组。通过对鄂尔多斯盆地内 11 个钻孔岩心的 δ15NTN 和 δ34Spy 系统学研究,我们重建了长七期底栖动物优生带的时空分布。我们的研究结果表明,底栖氧化还原条件具有很强的空间异质性,氧化还原边界从湖泊中部转移到了西南部地段。此外,我们还确定了氧化还原的控制因素,包括有机碳负荷、水深和潜在的水循环,并评估了它们与底栖氧化还原的相互作用。此外,水循环模式的识别可能为恢复古风向提供一种创新方法。这些发现凸显了将δ15NTN和δ34Spy耦合在一起重建底栖环境局部底栖氧化还原景观的有效性,并丰富了我们对生物地球化学过程的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Reconstructing Redox Landscape With Coupled Nitrogen-Sulfur Isotopes: A Case Study From Middle-Late Triassic Chang 7 Member of the Yanchang Formation in the Ordos Basin (North China)

Euxinia, a crucial geological condition, usually signifies more severe extinction events attributed to deoxygenation in Earth's history. Despite extensive exploration of various proxies in paleoredox studies, most are primarily utilized to reconstruct atmospheric pO2, the proportion of anoxic water relative to the entire basin, and broader trends in redox states. Few, however, hold the capacity to precisely delineate local euxinia within confined areas. To address this gap and gain insights into the temporal and spatial extent of benthic euxinia, we propose leveraging the synergistic analysis of total nitrogen isotopes (δ15NTN) and pyrite sulfur isotopes (δ34Spy). Our study focuses on the Triassic Chang 7 Member from the Yanchang Formation, Ordos Basin, North China. Through coupling the δ15NTN and δ34Spy systematics on 11 drill cores within the Ordos Basin, we reconstruct the temporal and spatial distribution of the benthic euxinia zone during the Chang-7 period. Our results suggest strong spatial heterogeneity of benthic redox conditions, with the euxinia boundary shifting from the central lake to the southwestern sections. Moreover, we identify redox-controlling factors, including organic carbon loading, water depth, and potential water circulation, and evaluate their interplay with benthic euxinia. Furthermore, the discernment of water circulation patterns may provide an innovative approach to restore the paleowind direction. These findings highlight the effectiveness of coupling δ15NTN and δ34Spy in reconstructing the local benthic redox landscape of benthic environments, and enrich our understanding of biogeochemical processes.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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