Terrestrial sources as the primary delivery mechanism of mercury to the oceans across the Toarcian Oceanic Anoxic Event (Early Jurassic) | |
T.R. Them II; C.H. Jagoe; A.H. Caruthers; B.C. Gill; S.E. Grasby; D.R. Gröcke; R. Yin; J.D. Owens | |
2019 | |
发表期刊 | Earth and Planetary Science Letters |
卷号 | 507页码:62-72 |
摘要 | This study evaluates the utility of sedimentary mercury (Hg) contents as a proxy for fingerprinting ancient massive volcanism, which is often associated with biogeochemical perturbations. Herein we present new Hg geochemical data from anoxic marine basins across the Toarcian Oceanic Anoxic Event (T-OAE; ∼183 Ma) as a test of the complex Hg cycle. The T-OAE was likely initiated by the main eruptive phase of the Karoo–Ferrar large igneous province, which caused a subsequent cascade of environmental perturbations and resulting mass extinction. At present the leading interpretation of sedimentary Hg anomalies has been volcanogenic outgassing as the primary source. Our study and compilation results suggest, however, that Hg/TOC anomalies were restricted to shallow-water, and/or proximal environments, while deep-water, more distal depositional settings document no significant Hg-related anomalies. Furthermore, asynchronous stratigraphic deviations in Hg enrichments favor terrestrially sourced materials and local redox variability, rather than direct volcanogenic emissions, as a primary control mechanism. Additionally, Hg isotope signatures from our only study site documenting an Hg anomaly are also consistent with a terrestrial Hg origin during the T-OAE. Therefore, our results suggest that Hg anomalies in the geological record need to be re-evaluated as a “smoking gun” proxy that only infers volcanogenic inputs. |
关键词 | Toarcian Oceanic Anoxic Event Carbon Isotope Excursion Hg Anomalies Hg Isotopes Large Igneous Provinces Mass Extinction |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/10917 |
专题 | 矿床地球化学国家重点实验室 |
作者单位 | 1.Department of Geology and Environmental Geosciences, College of Charleston, Charleston, SC 29424, USA 2.School of the Environment, Florida A&M University, Tallahassee, FL 32307, USA 3.Department of Geosciences, Western Michigan University, Kalamazoo, MI 49006, USA 4.Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA 5.Geological Survey of Canada, Natural Resources Canada, Calgary, Alberta T2L 2A7, Canada 6.Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK 7.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 8.Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32306, USA 9.National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA |
推荐引用方式 GB/T 7714 | T.R. Them II;C.H. Jagoe;A.H. Caruthers;B.C. Gill;S.E. Grasby;D.R. Gröcke;R. Yin; J.D. Owens. Terrestrial sources as the primary delivery mechanism of mercury to the oceans across the Toarcian Oceanic Anoxic Event (Early Jurassic)[J]. Earth and Planetary Science Letters,2019,507:62-72. |
APA | T.R. Them II;C.H. Jagoe;A.H. Caruthers;B.C. Gill;S.E. Grasby;D.R. Gröcke;R. Yin; J.D. Owens.(2019).Terrestrial sources as the primary delivery mechanism of mercury to the oceans across the Toarcian Oceanic Anoxic Event (Early Jurassic).Earth and Planetary Science Letters,507,62-72. |
MLA | T.R. Them II;C.H. Jagoe;A.H. Caruthers;B.C. Gill;S.E. Grasby;D.R. Gröcke;R. Yin; J.D. Owens."Terrestrial sources as the primary delivery mechanism of mercury to the oceans across the Toarcian Oceanic Anoxic Event (Early Jurassic)".Earth and Planetary Science Letters 507(2019):62-72. |
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