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Article: Oceanic lithosphere 4. The origin and evolution of oceanic lithosphere: Magmatic processes at oceanic spreading centres

TitleOceanic lithosphere 4. The origin and evolution of oceanic lithosphere: Magmatic processes at oceanic spreading centres
Authors
Issue Date2000
PublisherGeological Association of Canada. The Journal's web site is located at http://www.gac.ca/JOURNALS/geocan.html
Citation
Geoscience Canada, 2000, v. 27 n. 3, p. 131-146 How to Cite?
AbstractPrimary melts generated in the oceanic mantle migrate upward and pond at major discontinuities to form magma chambers. Such chambers have thus far been identified only on fast- and intermediate-spreading ridges but probably also exist at slow-spreading ridges. The size, shape and longevity of subrift chambers reflect the magma supply rate, the extent of hydrothermal cooling, and the regional stress field. Ophiolite studies suggest small, ephemeral chambers rather than large, long-lived bodies. At fast-spreading ridges the chambers probably consist largely of crystalline mush, possibly with some melt sills, and a thin melt zone at the top. At slower-spreading ridges, magmatic activity is more episodic and seafloor spreading may be punctuated by periods of mainly tectonic extension. Fractionating melts in the chambers are buffered by injections of more primitive melt from depth to produce the relatively uniform composition of MORB. The gross structural uniformity of the ocean crust must reflect extensive interplay and feedback of magmatic, hydrothermal and tectonic processes, resulting in a self-ordered system.
Persistent Identifierhttp://hdl.handle.net/10722/72875
ISSN
2015 Impact Factor: 1.225
2015 SCImago Journal Rankings: 0.577
References

 

DC FieldValueLanguage
dc.contributor.authorMalpas, Jen_HK
dc.contributor.authorRobinson, PTen_HK
dc.date.accessioned2010-09-06T06:45:55Z-
dc.date.available2010-09-06T06:45:55Z-
dc.date.issued2000en_HK
dc.identifier.citationGeoscience Canada, 2000, v. 27 n. 3, p. 131-146en_HK
dc.identifier.issn0315-0941en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72875-
dc.description.abstractPrimary melts generated in the oceanic mantle migrate upward and pond at major discontinuities to form magma chambers. Such chambers have thus far been identified only on fast- and intermediate-spreading ridges but probably also exist at slow-spreading ridges. The size, shape and longevity of subrift chambers reflect the magma supply rate, the extent of hydrothermal cooling, and the regional stress field. Ophiolite studies suggest small, ephemeral chambers rather than large, long-lived bodies. At fast-spreading ridges the chambers probably consist largely of crystalline mush, possibly with some melt sills, and a thin melt zone at the top. At slower-spreading ridges, magmatic activity is more episodic and seafloor spreading may be punctuated by periods of mainly tectonic extension. Fractionating melts in the chambers are buffered by injections of more primitive melt from depth to produce the relatively uniform composition of MORB. The gross structural uniformity of the ocean crust must reflect extensive interplay and feedback of magmatic, hydrothermal and tectonic processes, resulting in a self-ordered system.en_HK
dc.languageengen_HK
dc.publisherGeological Association of Canada. The Journal's web site is located at http://www.gac.ca/JOURNALS/geocan.htmlen_HK
dc.relation.ispartofGeoscience Canadaen_HK
dc.titleOceanic lithosphere 4. The origin and evolution of oceanic lithosphere: Magmatic processes at oceanic spreading centresen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0315-0941&volume=273&spage=131&epage=146&date=2000&atitle=Oceanic+Lithosphere+4.+The+Origin+and+Evolution+of+Oceanic+Lithosphere:+Magmatic+Processes+at+Oceanic+Spreading+Centres.en_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0040194026en_HK
dc.identifier.hkuros64705en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0040194026&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume27en_HK
dc.identifier.issue3en_HK
dc.identifier.spage131en_HK
dc.identifier.epage146en_HK
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.scopusauthoridRobinson, PT=7403720506en_HK

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