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Phosphorus sources for phosphatic Cambrian carbonates

2013; Geological Society of America; Volume: 126; Issue: 1-2 Linguagem: Inglês

10.1130/b30819.1

1943-2674

Jessica R. Creveling, David T. Johnston, Simon W. Poulton, Benjamin Kotrc, Christian März, Daniel P. Schrag, Andrew H. Knoll,

Calcium Carbonate Crystallization and Inhibition

Research Article| January 01, 2014 Phosphorus sources for phosphatic Cambrian carbonates Jessica R. Creveling; Jessica R. Creveling † 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA †E-mails: jcrevel@gps.caltech.edu; johnston@eps.harvard.edu Search for other works by this author on: GSW Google Scholar David T. Johnston; David T. Johnston † 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA †E-mails: jcrevel@gps.caltech.edu; johnston@eps.harvard.edu Search for other works by this author on: GSW Google Scholar Simon W. Poulton; Simon W. Poulton 2School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK Search for other works by this author on: GSW Google Scholar Benjamin Kotrc; Benjamin Kotrc 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar Christian März; Christian März 3School of Civil Engineering and Geosciences, Newcastle University, Drummond Building, Newcastle upon Tyne, NE1 7RU, UK Search for other works by this author on: GSW Google Scholar Daniel P. Schrag; Daniel P. Schrag 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar Andrew H. Knoll Andrew H. Knoll 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA4Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Jessica R. Creveling † 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA David T. Johnston † 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Simon W. Poulton 2School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK Benjamin Kotrc 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Christian März 3School of Civil Engineering and Geosciences, Newcastle University, Drummond Building, Newcastle upon Tyne, NE1 7RU, UK Daniel P. Schrag 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Andrew H. Knoll 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA4Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, Massachusetts 02138, USA †E-mails: jcrevel@gps.caltech.edu; johnston@eps.harvard.edu Publisher: Geological Society of America Received: 06 Nov 2012 Revision Received: 13 Aug 2013 Accepted: 30 Sep 2013 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2013 Geological Society of America GSA Bulletin (2014) 126 (1-2): 145–163. https://doi.org/10.1130/B30819.1 Article history Received: 06 Nov 2012 Revision Received: 13 Aug 2013 Accepted: 30 Sep 2013 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jessica R. Creveling, David T. Johnston, Simon W. Poulton, Benjamin Kotrc, Christian März, Daniel P. Schrag, Andrew H. Knoll; Phosphorus sources for phosphatic Cambrian carbonates. GSA Bulletin 2014;; 126 (1-2): 145–163. doi: https://doi.org/10.1130/B30819.1 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 SocietyGSA Bulletin Search Advanced Search Abstract The fossilization of organic remains and shell material by calcium phosphate minerals provides an illuminating, but time-bounded, window into Ediacaran–Cambrian animal evolution. For reasons that remain unknown, phosphatic fossil preservation declined significantly through Cambrian Series 2. Here, we investigate the phosphorus (P) sources for phosphatic Cambrian carbonates, presenting sedimentological, petrographic, and geochemical data from the Cambrian Series 2–3 Thorntonia Limestone, Australia, some of the youngest Cambrian strata to display exceptional phosphatic preservation of small shelly fossils. We find that within Thorntonia sediments, phosphate was remobilized by organic decay and bacterial iron reduction, with subsequent reprecipitation largely as apatite within the interiors of small shelly fossils. We discuss the merits of bioclastic-derived, organic matter–bound, or iron-bound P as potential sources to these strata. Petrographic observations suggest that the dissolution of phosphatic skeletal material did not provide the P for fossil preservation. In contrast, high organic carbon contents imply significant organic fluxes of P to Thorntonia sediments. Sedimentology and iron-speciation data indicate that phosphorus enrichment occurred during times of expanded anoxic, ferruginous conditions in subsurface water masses, suggesting that phosphorus adsorption to iron minerals precipitating from the water column provided a second significant P source to Thorntonia sediments. Simple stoichiometric models suggest that, by themselves, neither organic carbon burial nor an iron shuttle can account for the observed phosphorus enrichment. Thus, we infer that both processes were necessary for the observed phosphorus enrichment and subsequent fossil preservation in the Thorntonia Limestone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.