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SURVIVING IN THE WATER COLUMN: DEFINING THE TAPHONOMICALLY ACTIVE ZONE IN PELAGIC SYSTEMS

2018; Society for Sedimentary Geology; Volume: 33; Issue: 3 Linguagem: Inglês

10.2110/palo.2017.032

1938-5323

Sandro Monticelli Petró, Matias do Nascimento Ritter, M A Pivel, João Carlos Coimbra,

Mercury impact and mitigation studies

Research Article| March 12, 2018 SURVIVING IN THE WATER COLUMN: DEFINING THE TAPHONOMICALLY ACTIVE ZONE IN PELAGIC SYSTEMS SANDRO MONTICELLI PETRÓ; SANDRO MONTICELLI PETRÓ 1Programa de Pós-Graduação em Geociências, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil Search for other works by this author on: GSW Google Scholar MATIAS DO NASCIMENTO RITTER; MATIAS DO NASCIMENTO RITTER 1Programa de Pós-Graduação em Geociências, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil Search for other works by this author on: GSW Google Scholar MARÍA ALEJANDRA GÓMEZ PIVEL; MARÍA ALEJANDRA GÓMEZ PIVEL 2Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil Search for other works by this author on: GSW Google Scholar JOÃO CARLOS COIMBRA JOÃO CARLOS COIMBRA 2Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information SANDRO MONTICELLI PETRÓ 1Programa de Pós-Graduação em Geociências, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil MATIAS DO NASCIMENTO RITTER 1Programa de Pós-Graduação em Geociências, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil MARÍA ALEJANDRA GÓMEZ PIVEL 2Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil JOÃO CARLOS COIMBRA 2Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Rio Grande do Sul, Brazil e-mail: sandro.m.petro@gmail.com Publisher: SEPM Society for Sedimentary Geology First Online: 20 Mar 2018 Online Issn: 1938-5323 Print Issn: 0883-1351 Copyright © 2018, SEPM (Society for Sedimentary Geology) PALAIOS (2018) 33 (3): 85–93. https://doi.org/10.2110/palo.2017.032 Article history First Online: 20 Mar 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation SANDRO MONTICELLI PETRÓ, MATIAS DO NASCIMENTO RITTER, MARÍA ALEJANDRA GÓMEZ PIVEL, JOÃO CARLOS COIMBRA; SURVIVING IN THE WATER COLUMN: DEFINING THE TAPHONOMICALLY ACTIVE ZONE IN PELAGIC SYSTEMS. PALAIOS 2018;; 33 (3): 85–93. doi: https://doi.org/10.2110/palo.2017.032 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 SocietyPALAIOS Search Advanced Search Abstract The dynamic physical interval where postmortem alteration of biological remains takes place is widely known as the taphonomically active zone (TAZ). In benthic systems, the TAZ is conventionally considered to be delimited by an upper boundary at the sediment-water interface and a lower boundary corresponding roughly to the deepest sediment layer influenced by bioturbation. However, this definition was developed in the context of marine or continental environments inhabited by benthic fauna and disregards the modifications that pelagic remains undergo while sinking through the water column. Indeed, long before the skeletal remains of planktonic organisms reach the sediment-water interface, they may suffer significant taphonomic damage, primarily due to dissolution. The magnitude of dissolution depends on the composition of the skeletal remains, seawater properties, and the nature and intensity of biological processes in the water column. In open ocean environments, siliceous remains (e.g., diatoms, radiolarians) suffer enhanced dissolution in the upper water column, where seawater is undersaturated in silica, whereas pelagic carbonate remains (e.g., foraminifers, coccolithophores) experience higher dissolution below the lysocline (the depth where there is a sharp increase in dissolution rate) until they reach the carbonate compensation depth (CCD), where dissolution is complete. Therefore, we argue that the TAZ concept for pelagic organisms should be extended to include the water column through which they settle after death. Furthermore, the extent of taphonomic damage of pelagic microfossils can be used as a potential proxy for past changes in seawater chemistry and circulation related to oceanographic conditions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.