Formation and emplacement ages of the Masirah ophiolite, Sultanate of Oman

Abstract

Research Article| May 01, 1991 Formation and emplacement ages of the Masirah ophiolite, Sultanate of Oman J. D. Smewing; J. D. Smewing 1Earth Resources Institute, University Innovation Centre, Singleton Park, Swansea SA2 8PP, England Search for other works by this author on: GSW Google Scholar I. L. Abbotts; I. L. Abbotts 2Clyde Petroleum plc, Coddington Court, Coddington, Ledbury, Herefordshire HR8 1JL, England Search for other works by this author on: GSW Google Scholar L. A. Dunne; L. A. Dunne 3Amoco Production Company, P.O. Box 3092, Houston, Texas 77253 Search for other works by this author on: GSW Google Scholar D. C. Rex D. C. Rex 4Department of Earth Sciences, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire LS2 9JT, England Search for other works by this author on: GSW Google Scholar Author and Article Information J. D. Smewing 1Earth Resources Institute, University Innovation Centre, Singleton Park, Swansea SA2 8PP, England I. L. Abbotts 2Clyde Petroleum plc, Coddington Court, Coddington, Ledbury, Herefordshire HR8 1JL, England L. A. Dunne 3Amoco Production Company, P.O. Box 3092, Houston, Texas 77253 D. C. Rex 4Department of Earth Sciences, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire LS2 9JT, England Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (5): 453–456. https://doi.org/10.1130/0091-7613(1991)019<0453:FAEAOT>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J. D. Smewing, I. L. Abbotts, L. A. Dunne, D. C. Rex; Formation and emplacement ages of the Masirah ophiolite, Sultanate of Oman. Geology 1991;; 19 (5): 453–456. doi: https://doi.org/10.1130/0091-7613(1991)019<0453:FAEAOT>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 SocietyGeology Search Advanced Search Abstract Hornblende separates from gabbros and biotite separates from crosscutting potassic granites of the Masirah ophiolite have been analyzed by conventional K-Ar techniques. The gabbros have Late Jurassic-Early Cretaceous ages (126-158 Ma), and the granites have broadly similar ages (124-146 Ma). Because the gabbros are likely to give ophiolite formation ages and the granites ophiolite emplacement ages, it can be concluded that the Masirah ophiolite was emplaced very soon after formation. The Late Jurassic-Early Cretaceous ages contrast with the middle Cretaceous ages (90-95 Ma) of the Semail ophiolite, confirming earlier suggestions that the Masirah ophiolite cannot simply be a right-laterally displaced fragment of the Semail ophiolite, but is instead an uplifted block of Indian Ocean crust. The formation and emplacement of the Masirah ophiolite are discussed in the context of the late Mesozoic evolution of the western Indian Ocean. 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.