High-Alumina Glaucony from the Middle Cambrian of Oland and Bornholm, Southern Baltoscandia

Other| September 01, 1983 High-alumina glaucony from the Middle Cambrian of Oeland and Bornholm, southern Baltoscandia Vivianne Berg-Madsen Vivianne Berg-Madsen Univ. Uppsala, Dep. Paleobio., Uppsala, Sweden Search for other works by this author on: GSW Google Scholar Author and Article Information Vivianne Berg-Madsen Univ. Uppsala, Dep. Paleobio., Uppsala, Sweden Publisher: SEPM Society for Sedimentary Geology First Online: 03 Mar 2017 Online ISSN: 1938-3681 Print ISSN: 1527-1404 GeoRef, Copyright 2006, American Geological Institute. Journal of Sedimentary Research (1983) 53 (3): 875–893. https://doi.org/10.1306/212F82DD-2B24-11D7-8648000102C1865D Article history First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Vivianne Berg-Madsen; High-alumina glaucony from the Middle Cambrian of Oeland and Bornholm, southern Baltoscandia. Journal of Sedimentary Research 1983;; 53 (3): 875–893. doi: https://doi.org/10.1306/212F82DD-2B24-11D7-8648000102C1865D 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 SocietyJournal of Sedimentary Research Search Advanced Search Abstract These glauconies show a characteristic high silica (> 50%), high alumina (> 10%), and low iron (< 18%) content. The total iron values, as well as substitution of aluminum by iron, indicate a gradual transition between illitic and glauconitic minerals, and support the layer-structure theory to some extent. There is no correlation between interlayer cations, and aluminum/iron. The chemical composition can be related to formation and deposition in shallow, cool water. All progressive stages of weathering from glaucony to goethite are found in the Kalby Member of the Exsulans Ls. Fm. A new morphological type of glaucony is described: molds closely replicating the (inorganic) pore space where they occur, having imprints of crystal faces from the surrounding calcite cement.--Modified journal abstract. 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.