
Mercury anomaly, Deccan volcanism, and the end-Cretaceous mass extinction
2016; Geological Society of America; Volume: 44; Issue: 2 Linguagem: Inglês
10.1130/g37451.1
ISSN1943-2682
AutoresEric Font, Thierry Adatte, Alcídes N. Sial, Luiz Drude de Lacerda, Gerta Keller, Jahnavi Punekar,
Tópico(s)Geology and Paleoclimatology Research
ResumoResearch Article| February 01, 2016 Mercury anomaly, Deccan volcanism, and the end-Cretaceous mass extinction Eric Font; Eric Font * 1IDL-FCUL (Instituto Dom Luís, Faculdade de Ciências da Universidade de Lisboa), Campo Grande, Edifício C1, Piso 1, 1749-016 Lisbon, Portugal *E-mail: font_eric@hotmail.com Search for other works by this author on: GSW Google Scholar Thierry Adatte; Thierry Adatte 2ISTE (Institute of Earth Sciences), Geopolis, University of Lausanne, CH-1015 Lausanne, Switzerland Search for other works by this author on: GSW Google Scholar Alcides Nobrega Sial; Alcides Nobrega Sial 3NEG-LABISE (Nucleus of Geochemical Studies Stable Isotope Laboratory), Department of Geology, Federal University of Pernambuco, P.O. Box 7852, Recife, PE 50740-530, Brazil Search for other works by this author on: GSW Google Scholar Luiz Drude de Lacerda; Luiz Drude de Lacerda 4LABOMAR, Institute of Marine Sciences, Federal University of Ceará, Fortaleza, 60165-081, Brazil Search for other works by this author on: GSW Google Scholar Gerta Keller; Gerta Keller 5Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544, USA Search for other works by this author on: GSW Google Scholar Jahnavi Punekar Jahnavi Punekar 5Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Eric Font * 1IDL-FCUL (Instituto Dom Luís, Faculdade de Ciências da Universidade de Lisboa), Campo Grande, Edifício C1, Piso 1, 1749-016 Lisbon, Portugal Thierry Adatte 2ISTE (Institute of Earth Sciences), Geopolis, University of Lausanne, CH-1015 Lausanne, Switzerland Alcides Nobrega Sial 3NEG-LABISE (Nucleus of Geochemical Studies Stable Isotope Laboratory), Department of Geology, Federal University of Pernambuco, P.O. Box 7852, Recife, PE 50740-530, Brazil Luiz Drude de Lacerda 4LABOMAR, Institute of Marine Sciences, Federal University of Ceará, Fortaleza, 60165-081, Brazil Gerta Keller 5Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544, USA Jahnavi Punekar 5Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544, USA *E-mail: font_eric@hotmail.com Publisher: Geological Society of America Received: 28 Oct 2015 Revision Received: 30 Dec 2015 Accepted: 05 Jan 2016 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2016 Geological Society of America Geology (2016) 44 (2): 171–174. https://doi.org/10.1130/G37451.1 Article history Received: 28 Oct 2015 Revision Received: 30 Dec 2015 Accepted: 05 Jan 2016 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Eric Font, Thierry Adatte, Alcides Nobrega Sial, Luiz Drude de Lacerda, Gerta Keller, Jahnavi Punekar; Mercury anomaly, Deccan volcanism, and the end-Cretaceous mass extinction. Geology 2016;; 44 (2): 171–174. doi: https://doi.org/10.1130/G37451.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The contribution of the Deccan Traps (west-central India) volcanism in the Cretaceous-Paleogene (KPg) crisis is still a matter of debate. Recent U-Pb dating of zircons interbedded within the Deccan lava flows indicate that the main eruptive phase (>1.1 × 106 km3 of basalts) initiated ∼250 k.y. before and ended ∼500 k.y. after the KPg boundary. However, the global geochemical effects of Deccan volcanism in the marine sedimentary record are still poorly resolved. Here we investigate the mercury (Hg) content of the Bidart (France) section, where an interval of low magnetic susceptibility (MS) located just below the KPg boundary was hypothesized to result from paleoenvironmental perturbations linked to the paroxysmal Deccan phase 2. Results show Hg concentrations >2 orders of magnitude higher from ∼80 cm below to ∼50 cm above the KPg boundary (maximum 46.6 ppb) and coincident with the low MS interval. Increase in Hg contents shows no correlation with clay or total organic carbon contents, suggesting that the Hg anomalies resulted from higher input of atmospheric Hg species into the marine realm, rather than organic matter scavenging and/or increased runoff. The Hg anomalies correlate with high shell fragmentation and dissolution effects in planktic foraminifera, suggesting correlative changes in marine biodiversity. This discovery represents an unprecedented piece of evidence of the nature and importance of the Deccan-related environmental changes at the onset of the KPg mass extinction. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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