全球增强的汞沉积和K/Pg和PT边界的汞同位素:与火山作用有关

Goldschmidt Abstracts Pub Date : 2020-01-01 DOI:10.46427/gold2020.2378

A. Sial, Jiubin Chen, L. D. de Lacerda, C. Korte, Jorge Spnagenberg, J. C. Silva-Tamayo, C. Gaucher, V. Ferreira, J. Barbosa, N. Pereira, P. Riedel

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引用次数: 0

摘要

八个经典PTB剖面的汞(Hg/TOC)峰值在灭绝间隔中显示出相似的模式。在梅山，这些峰值在LPME和ETME，而在Hovea-3, Ursula Creek, Idrijca和Rizvanu š a，它们在LPME和PTB。Rizvanu š a剖面显示ETME有一个峰;Zal和Abadeh剖面在LPME和ETME富集，Misci剖面在LPME富集。在Stevns Klint, Gubbio, Um Sohringkew和Poty K/Pg剖面中可以看到三个Hg/TOC峰值:CF2生物带内的峰值I, K/Pg边界层内的峰值II和P1a亚带内的峰值III。在δ 202 Hg (MDF) vs∆201 Hg (MIF)图中，大部分PT消光区间的样品位于火山喷发盒内。Hg同位素特征是火山和正常海相沉积物汞混合形成的，形成4个趋势，其中∆201 Hg的变化可以忽略不计。里兹瓦努什、伊德里贾察和米西各区，较靠近STLIP;

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Globally Enhanced Hg Deposition and Hg Isotopes in the K/Pg and PT Boundaries: Link to Volcanism

Mercury (Hg/TOC) spikes from eight classical PTB sections display similar patterns across the extinction interval. At Meishan, these spikes are in the LPME and ETME while at Hovea-3, Ursula Creek, Idrijca and Rizvanu š a they are at the LPME and PTB. The Rizvanu š a section displays one peak at the ETME; Zal and Abadeh sections, at the LPME and ETME, while Misci shows enrichment at the LPME. Three Hg/TOC spikes are seen in the Stevns Klint, Gubbio, Um Sohringkew and Poty K/Pg sections: spike I within the CF2 biozone, spike II at the K/Pg boundary layer, and spike III within the P1a subzone. In a δ 202 Hg (MDF) vs ∆ 201 Hg (MIF) plot, most samples from the PT extinction interval lie within the volcanic-emission box. Hg-isotope signatures resulted from mixing of volcanic and normal marine sediment Hg, generating four trends whose ∆ 201 Hg show negligible variation. Rizvanu š a, Idrijca and Misci sections, closer to the STLIP,

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