Origin of minor limestone-shale cycles: Climatically induced or diagenetic?

Research Article| July 01, 1986 Origin of minor limestone-shale cycles: Climatically induced or diagenetic? A. Hallam A. Hallam 1Department of Geological Sciences, University of Birmingham, P.O. Box 363, Birmingham B15 2TT, England Search for other works by this author on: GSW Google Scholar Geology (1986) 14 (7): 609–612. https://doi.org/10.1130/0091-7613(1986)14<609:OOMLCC>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 MailTo Tools Icon Tools Get Permissions Search Site Citation A. Hallam; Origin of minor limestone-shale cycles: Climatically induced or diagenetic?. Geology 1986;; 14 (7): 609–612. doi: https://doi.org/10.1130/0091-7613(1986)14<609:OOMLCC>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 The opinion is widely held that each limestone bed in minor limestone-shale cyclic sequences, however modified subsequently by diagenesis, reflects an environmental event. On the assumption that this is true, attempts have recently been made to relate limestone-shale cycles to climatic variations affected by "Milankovitch" orbital cycles. A test is proposed and illustrated mainly with reference to the Blue Lias Formation of Dorset, England, that appears to indicate that many limestones can be produced solely by rhythmic unmixing of CaCO3 during diagenesis. Unless such limestones can be clearly distinguished from those that record genuine environmental signals, orbital cycle analysis based on such sequences will give meaningless results. 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.