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A subduction originfor komatiites andcratonic lithosphericmantle S. W. Parman2004 год

A subduction origin for komatiites and cratonic lithospheric mantle
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Аннотация: Research Article| June 01, 2004 A subduction origin for komatiites and cratonic lithospheric mantle Stephen W. Parman; Stephen W. Parman Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA, e-mail: parman@mit.edu, tlgrove@mit.edu, djdann@prodigy.net Search for other works by this author on: GSW Google Scholar Timothy L. Grove; Timothy L. Grove Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA, e-mail: parman@mit.edu, tlgrove@mit.edu, djdann@prodigy.net Search for other works by this author on: GSW Google Scholar Jesse C. Dann; Jesse C. Dann Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA, e-mail: parman@mit.edu, tlgrove@mit.edu, djdann@prodigy.net Search for other works by this author on: GSW Google Scholar Maarten J. de Wit Maarten J. de Wit Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa, e-mail: maarten@cigces.uct.ac.za Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen W. Parman Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA, e-mail: parman@mit.edu, tlgrove@mit.edu, djdann@prodigy.net Timothy L. Grove Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA, e-mail: parman@mit.edu, tlgrove@mit.edu, djdann@prodigy.net Jesse C. Dann Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA, e-mail: parman@mit.edu, tlgrove@mit.edu, djdann@prodigy.net Maarten J. de Wit Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa, e-mail: maarten@cigces.uct.ac.za Publisher: Geological Society of South Africa First Online: 07 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2003 Geological Society of South Africa South African Journal of Geology (2004) 107 (1-2): 107–118. https://doi.org/10.2113/107.1-2.107 Article history First Online: 07 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 Stephen W. Parman, Timothy L. Grove, Jesse C. Dann, Maarten J. de Wit; A subduction origin for komatiites and cratonic lithospheric mantle. South African Journal of Geology 2004;; 107 (1-2): 107–118. doi: https://doi.org/10.2113/107.1-2.107 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 SocietySouth African Journal of Geology Search Advanced Search Abstract We present a model in which the generation of komatiites in Archaean subduction zones produced depleted mantle residues that eventually formed the highly depleted portions of the Kaapvaal lithospheric mantle. The envisioned melting process is similar to that which has formed boninites in Phanerozoic subduction zones such as the Izu-Bonin-Mariana arc. The primary differences between the Archaean and Phanerozoic melting regimes are higher mean melting temperatures (1450 versus 1350 °C) and higher mean melting pressures (2.5 versus 1.5 GPa) for the komatiites. The komatiites from the Komati Formation in the Barberton greenstone belt are mafic enough to have produced the depletion seen in most Kaapvaal granular peridotite xenoliths. However, the most highly depleted Kaapvaal xenoliths require an even more Mg-rich magma than the Komati komatiites (Kk). Samples of boninite mantle residues from the fore-arc of the Marianas subduction zone are nearly as depleted as the Kaapvaal cratonic mantle, indicating that buoyant, craton-like mantle is being produced today. We speculate that production rates of cratonic mantle were greater in the Archaean due to the greater depth of melting for komatiites (relative to boninites) and greater worldwide arc length. The high production rates and high buoyancy of the komatiite mantle residues gave rise to the rapid growth and stabilization of the Kaapvaal craton in the Archaean. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 2004
Авторы: S. W. Parman
Издательство: Geological Society of South Africa
Источник: South African Journal of Geology
Ключевые слова: High-pressure geophysics and materials, Geological and Geochemical Analysis, earthquake and tectonic studies
Другие ссылки: South African Journal of Geology (HTML)
Open University of Cape Town (University of Cape Town) (PDF)
Open University of Cape Town (University of Cape Town) (HTML)