Mercury Deposition in South China Across the Ordovician-Silurian Transition: Implications for Climate Change

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Weiliang Kong, Zhen Qiu, Jiaqiang Zhang, Wen Liu, Qin Zhang
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Abstract

Most of the global climate changes are closely associated with volcanic activity. However, the link between global cooling during the Ordovician-Silurian (O-S) transition and volcanism remains unclear due to limited constraints on large volcanic events before, during, and after the peak of the Hirnantian glaciation (PHG). Here, we present high-resolution mercury (Hg) concentrations and isotopes from South China across the O-S transition to assess volcanic activity and its contributions to climate changes. Anomalous Hg enrichments and volcanic-range Hg isotopes in samples above volcanic ash layers confirm the effectiveness of Hg as a tracer of volcanic events. Variations in Hg isotopes across the O-S transition reveal multiple Hg sources related to volcanic activity, that is, dominant volcanic Hg input during pre-PHG and post-PHG-2, deposition of volcanic-sourced atmospheric Hg(II) to seawater during PHG, and increased terrestrial Hg input from enhanced weathering during post-PHG-1. We propose that prolonged global cooling was driven by an albedo catastrophe caused by volcanic aerosols and sustained by reduced atmospheric CO2 levels due to enhanced organic carbon burial and weathering. This study highlights Hg as a tracer of volcanic activity and provides new evidence on the role of volcanism in driving climate changes across the O-S transition.

Abstract Image

中国南方奥陶—志留纪过渡时期的汞沉积:对气候变化的影响
大多数全球气候变化都与火山活动密切相关。然而,奥陶-志留纪(O-S)过渡期间的全球变冷与火山作用之间的联系仍然不清楚,因为对希尔南天冰期(PHG)高峰之前、期间和之后的大型火山事件的限制有限。在这里,我们利用高分辨率的汞(Hg)浓度和同位素,从整个O-S过渡华南评估火山活动及其对气候变化的贡献。火山灰层上方样品中异常的汞富集和火山范围汞同位素证实了汞作为火山事件示踪剂的有效性。在整个O-S转换过程中,汞同位素的变化揭示了与火山活动有关的多种汞来源,即PHG前和PHG-2后的主要火山汞输入,PHG期间火山来源的大气汞(II)沉积到海水中,以及PHG-1后风化作用增强导致的陆地汞输入增加。我们认为,长期的全球变冷是由火山气溶胶引起的反照率灾难驱动的,并由有机碳埋藏和风化作用增强导致的大气二氧化碳水平降低所维持。这项研究强调了汞作为火山活动的示踪剂,并为火山作用在整个O-S过渡中驱动气候变化的作用提供了新的证据。
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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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