Primary and diagenetic carbonates in the anoxic sediments of Lake Bosumtwi, Ghana

Research Article| November 01, 1986 Primary and diagenetic carbonates in the anoxic sediments of Lake Bosumtwi, Ghana M. R. Talbot; M. R. Talbot 1Geologisk Institutt, Avd. A, Universitetet i Bergen, Allégaten 41, 5014 Bergen, Norway Search for other works by this author on: GSW Google Scholar K. Kelts K. Kelts 2Geology Section, Swiss Federal Institute of Water Resources (EAWAG/ETH), CH 8600 Dübendorf, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information M. R. Talbot 1Geologisk Institutt, Avd. A, Universitetet i Bergen, Allégaten 41, 5014 Bergen, Norway K. Kelts 2Geology Section, Swiss Federal Institute of Water Resources (EAWAG/ETH), CH 8600 Dübendorf, Switzerland Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1986) 14 (11): 912–916. https://doi.org/10.1130/0091-7613(1986)14<912:PADCIT>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation M. R. Talbot, K. Kelts; Primary and diagenetic carbonates in the anoxic sediments of Lake Bosumtwi, Ghana. Geology 1986;; 14 (11): 912–916. doi: https://doi.org/10.1130/0091-7613(1986)14<912:PADCIT>2.0.CO;2 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 Cores of organic-rich muds from the tropical meteorite crater Lake Bosumtwi, Ghana, contain laminae of authigenic calcite polyhedra and aragonite needles, as well as scattered diagenetic calcite, Mg-calcite spherulites, and aggregates of dolomite crystals. Their respective origins are traced by analyses of oxygen and carbon stable isotopes. Anoxic dolomite and Mg-calcite formed in pore waters reflecting highest degrees of evaporative concentration and high rates of methanogenesis. Carbon dioxide reduction must have been the dominant methanogenic pathway, producing diagenetic carbonates with δ13C values up to ±27‰ PDB. This example shows the inherent problems of interpreting bulk samples with progressive mineralogical sequences of calcite to Mg-calcite to aragonite to dolomite merely in terms of Mg2+/Ca2+ in lake waters. It provides a model for the interpretation of ancient lacustrine carbonates from organic-rich environments. 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.