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• W2070335768 abstract "Research Article| May 01, 2003 Plate-kinematic explanation for mid-oceanic-ridge depth discontinuities Christopher Small; Christopher Small 1Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar Leonid V. Danyushevsky Leonid V. Danyushevsky 2School of Earth Sciences and Centre for Ore Deposit Research, University of Tasmania, Hobart, Tasmania 7001, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Christopher Small 1Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA Leonid V. Danyushevsky 2School of Earth Sciences and Centre for Ore Deposit Research, University of Tasmania, Hobart, Tasmania 7001, Australia Publisher: Geological Society of America Received: 06 Aug 2002 Revision Received: 13 Jan 2003 Accepted: 21 Jan 2003 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (5): 399–402. https://doi.org/10.1130/0091-7613(2003)031<0399:PEFMDD>2.0.CO;2 Article history Received: 06 Aug 2002 Revision Received: 13 Jan 2003 Accepted: 21 Jan 2003 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 Christopher Small, Leonid V. Danyushevsky; Plate-kinematic explanation for mid-oceanic-ridge depth discontinuities. Geology 2003;; 31 (5): 399–402. doi: https://doi.org/10.1130/0091-7613(2003)031<0399:PEFMDD>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 global mid-ocean-ridge system is characterized by several regional-scale depth and geochemical anomalies. A prominent depth discontinuity between the East Pacific Rise and the Pacific-Antarctic Rise also coincides with a geochemical discontinuity that has been suggested by previous workers to indicate a boundary between distinct mantle- upwelling domains with separate convective histories. We propose a plate-kinematic origin for this discontinuity in which different rates of asthenospheric sequestration and spreading-center migration result in different equilibrium depths for different spreading centers. Absolute plate motions determine both the rate at which asthenosphere is converted to lithosphere (i.e., the sequestration rate) and the rate at which the spreading center moves relative to hotspots (i.e., the migration rate). If limits on the consumption (i.e., the sequestration/migration ratio) of asthenosphere by spreading centers are determined by the thickness and flux of asthenosphere, then the fast-spreading, slowly migrating East Pacific Rise should have a deeper equilibrium depth than the slower-spreading, rapidly migrating Pacific-Antarctic Rise. Sustained, localized asthenospheric consumption by the East Pacific Rise contrasts with the lower consumption and abundance of asthenospheric flux from hotspots near the Pacific-Antarctic Rise. A similar mechanism could explain the discontinuity between the localized depth anomaly on the Southwest Indian Ridge near the Bouvet hotspot and the much broader, but deeper, anomaly on the adjacent Mid-Atlantic Ridge, where asthenosphere is being transformed to lithosphere at more than three times the rate of the Southwest Indian or American-Antarctic Ridge. Geochemical evidence is consistent with the notion of deeper, more extensive melting under both of the spreading centers with anomalously high sequestration/migration ratios. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2070335768 title "Plate-kinematic explanation for mid-oceanic-ridge depth discontinuities" @default.
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• W2070335768 doi "https://doi.org/10.1130/0091-7613(2003)031<0399:pefmdd>2.0.co;2" @default.
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