New U-Pb zircon dates for the Neoproterozoic Ghubrah glaciation and for the top of the Huqf Supergroup, Oman

Research Article| February 01, 2000 New U-Pb zircon dates for the Neoproterozoic Ghubrah glaciation and for the top of the Huqf Supergroup, Oman Martin Brasier; Martin Brasier 1Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK Search for other works by this author on: GSW Google Scholar Gretta McCarron; Gretta McCarron 1Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK Search for other works by this author on: GSW Google Scholar Robert Tucker; Robert Tucker 2Department of Earth and Planetary Sciences, Washington University, Campus Box 1169, One Brookings Drive, St. Louis, Missouri 63130, USA Search for other works by this author on: GSW Google Scholar Jonathan Leather; Jonathan Leather 3Department of Geology, Trinity College, Dublin, Ireland Search for other works by this author on: GSW Google Scholar Philip Allen; Philip Allen 3Department of Geology, Trinity College, Dublin, Ireland Search for other works by this author on: GSW Google Scholar Graham Shields Graham Shields 4Centre de Geochimie de la Surface, CNRS-UMR 7517, Strasbourg, France Search for other works by this author on: GSW Google Scholar Author and Article Information Martin Brasier 1Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK Gretta McCarron 1Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK Robert Tucker 2Department of Earth and Planetary Sciences, Washington University, Campus Box 1169, One Brookings Drive, St. Louis, Missouri 63130, USA Jonathan Leather 3Department of Geology, Trinity College, Dublin, Ireland Philip Allen 3Department of Geology, Trinity College, Dublin, Ireland Graham Shields 4Centre de Geochimie de la Surface, CNRS-UMR 7517, Strasbourg, France Publisher: Geological Society of America Received: 15 Jun 1999 Revision Received: 09 Nov 1999 Accepted: 19 Nov 1999 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2000) 28 (2): 175–178. https://doi.org/10.1130/0091-7613(2000)282.0.CO;2 Article history Received: 15 Jun 1999 Revision Received: 09 Nov 1999 Accepted: 19 Nov 1999 First Online: 02 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 Martin Brasier, Gretta McCarron, Robert Tucker, Jonathan Leather, Philip Allen, Graham Shields; New U-Pb zircon dates for the Neoproterozoic Ghubrah glaciation and for the top of the Huqf Supergroup, Oman. Geology 2000;; 28 (2): 175–178. doi: https://doi.org/10.1130/0091-7613(2000)282.0.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 Huqf Supergroup, Oman, contains volcanic horizons with the potential to calibrate Neoproterozoic events and chemostratigraphy using U-Pb zircon geochronology. A tuffaceous bed near the base, within the lower (Ghubrah) diamictite and beneath a lower cap carbonate, provides the first U-Pb zircon date obtained from within a Neoproterozoic glacial deposit. This date of 723 +16/−10 Ma suggests a Sturtian age. Diamictites about 1 km higher in the section are overlain by the Hadash cap dolomite, which compares with cap dolomites above Marinoan glacial units elsewhere. A U-Pb zircon age of 544.5 ± 3.3 Ma from ignimbrites in the Fara Formation, near the top of the supergroup, is just beneath that of the Precambrian-Cambrian boundary (ca. 543 Ma), consistent with the presence of the Neoproterozoic skeletal-fossil Cloudina in correlative subsurface rocks. This revised chronology confirms the existence of four negative δ13C excursions between ca. 723 and 543 Ma, the lower two of which are clearly associated with glaciations. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.