Precambrian dolomites: Petrographic and isotopic evidence that they differ from Phanerozoic dolomites

Research Article| January 01, 1982 Precambrian dolomites: Petrographic and isotopic evidence that they differ from Phanerozoic dolomites Maurice E. Tucker Maurice E. Tucker 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Author and Article Information Maurice E. Tucker 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1982) 10 (1): 7–12. https://doi.org/10.1130/0091-7613(1982)102.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Maurice E. Tucker; Precambrian dolomites: Petrographic and isotopic evidence that they differ from Phanerozoic dolomites. Geology 1982;; 10 (1): 7–12. doi: https://doi.org/10.1130/0091-7613(1982)102.0.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 Dolomites are more common in Precambrian than in Phanerozoic rocks and, from a petrographic-isotopic study of the middle to upper Proterozoic Beck Spring Dolomite of eastern California, it is suggested that Precambrian dolomites are different from those of the Phanerozoic. Petrographically, all fabric details of Precambrian dolomites studied are preserved, just as if they were limestones, and isotopically, they show the same trend as limestones: increasingly negative δI8O and to a lesser extent increasingly light δI8C, from depositional components, through early fibrous dolomite cements to later dolomite spar cements. The data suggest that in Precambrian time dolomite was the principal carbonate mineral precipitated from seawater and during diagenesis, and this implies that Precambrian seawater was different from that of the Phanerozoic. 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.