Events and sea-level changes on Gondwana's margin: The Meguma Zone (Cambrian to Devonian) of Nova Scotia, Canada

Abstract

Research Article| April 01, 1991 Events and sea-level changes on Gondwana's margin: The Meguma Zone (Cambrian to Devonian) of Nova Scotia, Canada PAUL E. SCHENK PAUL E. SCHENK 1Department of Geology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1991) 103 (4): 512–521. https://doi.org/10.1130/0016-7606(1991)103<0512:EASLCO>2.3.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 PAUL E. SCHENK; Events and sea-level changes on Gondwana's margin: The Meguma Zone (Cambrian to Devonian) of Nova Scotia, Canada. GSA Bulletin 1991;; 103 (4): 512–521. doi: https://doi.org/10.1130/0016-7606(1991)103<0512:EASLCO>2.3.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 SocietyGSA Bulletin Search Advanced Search Abstract The Meguma Zone consists of thick, siliciclastic and volcaniclastic strata, and granitic plutons that underlie southern Nova Scotia and offshore areas. The strata were deposited from Late Cambrian through Early Devonian time on the continental margin of Gondwana. Grain size of the major stratigraphic units reflects the changing elevations of base level in the source region. Twelve major events in the zone can be related to changes in relative sea level and combined into four, second-order cycles. Each cycle consists of a fining-, then coarsening-upward sequence that is capped by subaerial volcaniclastic material. These subaerial events are assumed to represent significant hiati, and so are bounding unconformities. Two unconformities are at system boundaries; two, at sequence boundaries. Third-order cycles suggest idiosyncrasies of the source land. Ultimate cause of the Meguma cycles may be mantle activity that affected continental base level, relative sea level, and direction of continental drift. The Meguma curve is similar to that of northwest Africa. 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.