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Jurassic-Cretaceous boundary age and mid-ocean-ridge–type mantle source for Shatsky Rise

2005; Geological Society of America; Volume: 33; Issue: 3 Linguagem: Inglês

10.1130/g21378.1

1943-2682

John J. Mahoney, Robert A. Duncan, M. L. G. Tejada, William W. Sager, Timothy J. Bralower,

earthquake and tectonic studies

Research Article| March 01, 2005 Jurassic-Cretaceous boundary age and mid-ocean-ridge–type mantle source for Shatsky Rise J.J. Mahoney; J.J. Mahoney 1School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822, USA Search for other works by this author on: GSW Google Scholar R.A. Duncan; R.A. Duncan 2College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar M.L.G. Tejada; M.L.G. Tejada 3National Institute of Geological Sciences, University of the Philippines, Quezon City 1101, Philippines Search for other works by this author on: GSW Google Scholar W.W. Sager; W.W. Sager 4Department of Oceanography, Texas A&M University, College Station, Texas 77834, USA Search for other works by this author on: GSW Google Scholar T.J. Bralower T.J. Bralower 5Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA Search for other works by this author on: GSW Google Scholar Author and Article Information J.J. Mahoney 1School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822, USA R.A. Duncan 2College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA M.L.G. Tejada 3National Institute of Geological Sciences, University of the Philippines, Quezon City 1101, Philippines W.W. Sager 4Department of Oceanography, Texas A&M University, College Station, Texas 77834, USA T.J. Bralower 5Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA Publisher: Geological Society of America Received: 16 Nov 2004 Revision Received: 29 Nov 2004 Accepted: 30 Nov 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2005) 33 (3): 185–188. https://doi.org/10.1130/G21378.1 Article history Received: 16 Nov 2004 Revision Received: 29 Nov 2004 Accepted: 30 Nov 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation J.J. Mahoney, R.A. Duncan, M.L.G. Tejada, W.W. Sager, T.J. Bralower; Jurassic-Cretaceous boundary age and mid-ocean-ridge–type mantle source for Shatsky Rise. Geology 2005;; 33 (3): 185–188. doi: https://doi.org/10.1130/G21378.1 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 Basalt sills cored in lowermost Berriasian sediments on Shatsky Rise in the northwest Pacific yield a mean 40Ar-39Ar incremental heating age of 144.6 ± 0.8 Ma, providing a minimum estimate on the age of the Jurassic-Cretaceous boundary. The largest part of the rise was emplaced at rates similar to those of several continental flood basalts. The rise formed at an oceanic triple junction, and the sills, as well as lavas from two dredge sites, exhibit an ocean ridge–type Nd-Pb-Sr isotope signature. This signature is provisionally consistent with either a perisphere or meteorite-impact model, but is not predicted by the plume-head model of plateau formation. However, no model can yet be rejected, given the very sparse sampling of Shatsky Rise. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.