globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.07.019
论文题名:
Mercury as a proxy for volcanic activity during extreme environmental turnover: The Cretaceous-Paleogene transition
作者: Sial A.N.; Lacerda L.D.; Ferreira V.P.; Frei R.; Marquillas R.A.; Barbosa J.A.; Gaucher C.; Windmöller C.C.; Pereira N.S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 387
起始页码: 153
结束页码: 164
语种: 英语
英文关键词: Carbon isotope stratigraphy ; Cretaceous-Paleogene transition ; Mercury ; Thermo-desorption ; Volcanism
英文摘要: The usually low geological background concentrations of Hg makes this trace element suitable for identifying accumulation pulses in sediments that can be tentatively related to weathering processes and thus to climatic changes. Intense volcanism has witnessed the Cretaceous-Paleogene transition (KTB) and was, perhaps, responsible for dramatic climatic changes and decrease in biodiversity and mass extinction. We have used Hg concentrations as a proxy for volcanic activity and atmospheric Hg and CO2 buildup across the KTB at three localities. In the Salta Basin, Argentina, Hg contents display several spikes across the KTB, with a maximum value of 250ng·g-1. In three drill cores across the KTB in the Paraíba Basin, northeastern Brazil, Hg contents increase from the late Maastrichtian to early Danian and Hg spikes predate the KTB, perhaps, as a record of volcanic activity before (but very close to) this transition. At Stevns Klint, Denmark, Hg contents reached almost 250ng·g-1 within a 5cm thick-clay layer, the Fiskeler Member ('Fish Clay') that comprises the KTB. Some co-variation between Hg and Al2O3 contents has been observed in all of the studied sections across the KTB, suggesting that Hg is probably adsorbed onto clays. Thermo-desorption experiments in selected samples from the Yacoraite Formation showed Hg+2 as the major species present, which is in agreement with a volcanic origin. Combined Hg and C-isotope chemostratigraphy may become a powerful tool for the eventual assessment of the role of volcanic activity during extreme climatic and biotic events, such as those during the KTB. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69625
Appears in Collections:过去全球变化的重建

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作者单位: NEG-LABISE, Department of Geology, Federal University of Pernambuco, Recife, PE 50740-530, Brazil; LABOMAR, Institute of Marine Sciences, Federal University of Ceará, Fortaleza 60165-081, Brazil; Institute of Geography and Geology, University of Copenhagen, Oster Volgade 10, Copenhagen 1350, Denmark; Universidad de Salta, CONICET, Buenos Aires 177, 4400 Salta, Argentina; LAGESE, Department Geology, Federal University of Pernambuco, Recife 50740-530, Brazil; Facultad de Ciencias, Universidad de La Republica, Montevideo, Uruguay; Department of Chemistry, Federal University of Minas Gerais, Av. AntÔnio Carlos 6627, Belo Horizonte, Minas Gerais 31270-901, Brazil

Recommended Citation:
Sial A.N.,Lacerda L.D.,Ferreira V.P.,et al. Mercury as a proxy for volcanic activity during extreme environmental turnover: The Cretaceous-Paleogene transition[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,387
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