Effects of microbial activity on the delta¹⁸O of dissolved inorganic phosphate and textural features of synthetic apatites

Abstract

Other| December 01, 1998 Effects of microbial activity on the delta 18 O of dissolved inorganic phosphate and textural features of synthetic apatites R. E. Blake; R. E. Blake University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States Search for other works by this author on: GSW Google Scholar J. R. O'Neil; J. R. O'Neil Search for other works by this author on: GSW Google Scholar G. A. Garcia G. A. Garcia Search for other works by this author on: GSW Google Scholar Author and Article Information R. E. Blake University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States J. R. O'Neil G. A. Garcia Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online ISSN: 1945-3027 Print ISSN: 0003-004X GeoRef, Copyright 2004, American Geological Institute. American Mineralogist (1998) 83 (11-12_Part_2): 1516–1531. https://doi.org/10.2138/am-1998-11-1240 Article history First Online: 02 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 R. E. Blake, J. R. O'Neil, G. A. Garcia; Effects of microbial activity on the delta 18 O of dissolved inorganic phosphate and textural features of synthetic apatites. American Mineralogist 1998;; 83 (11-12_Part_2): 1516–1531. doi: https://doi.org/10.2138/am-1998-11-1240 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 SocietyAmerican Mineralogist Search Advanced Search Abstract Laboratory growth experiments were conducted to investigate the oxygen isotope effects associated with bacterial metabolism of phosphatic compounds commonly available in nature. The observed oxygen isotope fractionations suggest complex patterns of exchange between dissolved inorganic phosphate (P i ) and water, and significant circulation of P i between intracellular and extracellular locations with extensive recycling of the dissolved P i pool, even at high concentrations of dissolved P i . Results of these experiments also support current models for bacterial utilization of phosphate. These results have important implications for the use of delta 18 O values of dissolved P i to trace sources of P, and bear on integrity of original oxygen isotope compositions of biogenic and sedimentary apatite minerals that have been subjected to processes of recrystallization and diagenesis. SEM images of laboratory synthesized apatite minerals show that similar textural features may be produced by microbially mediated and abiotic reactions, and that spheroidal structures may be produced by processes of dissolution as well as precipitation. The interpretation of certain mineral structures as microbial in origin solely on the basis of morphological and textural features may be misleading. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.