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Article: Oceanic inside corner detachments of the Limassol Forest area, Troodos ophiolite, Cyprus

TitleOceanic inside corner detachments of the Limassol Forest area, Troodos ophiolite, Cyprus
Authors
KeywordsDetachment faults
Metamorphic core complexes
Transform faults
Troodos ophiolite
Issue Date2001
PublisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/gsl/publications/journals/jgs
Citation
Journal Of The Geological Society, 2001, v. 158 n. 5, p. 757-767 How to Cite?
AbstractFlat-lying extensional detachment faults have been imaged in the inside corner regions of ridge-transform intersections on the Mid-Atlantic Ridge. Exposed detachment surfaces are 10 km or more across, and are corrugated in the direction of spreading, as are continental detachments. Beneath the detachments lie core complexes of peridotite and gabbro; these are overlain by blocks of crustal material. We argue here that similar detachments are an essential component of the Limassol Forest area of the Troodos ophiolite in Cyprus, which lies south of the Arakapas Fault zone, previously recognized as a palaco-transform fault, and here interpreted as a transform fault that evolved into a fracture zone. In the Limassol Forest, core complexes of mantle peridotite can be shown to have been exposed at the sea floor, or to have been covered by overlapping crustal blocks, separated from the peridotite core and from each other by low-angle extensional faults. The extension can be shown to have occured shortly after crustal construction, and the already extended terrain was then intruded by swarms of dykes and plutons. We interpret these relations as arising when crust is constructed in an inside corner area, extended by detachment faulting, deformed further during slip along the transform, and then intruded by new magma as it passes the second spreading centre. The structurally deeper parts of the crustal blocks that overlie the detachment lie broadly towards the west, indicating that the spreading axis lay in that direction. The ophiolite north of the transform is much less extended, and we interpret this as a section of outside corner crust. In this interpretation, the Troodos ophiolite formed to the east (in its current orientation) of a ridge-transform-ridge intersection, in which the transform had a dextral offset and sinistral slip. The part of the ophiolite that forms the Limassol Forest was produced at the western inside corner, and spread eastward until it passed the second spreading axis, at which point the ophiolite north of the Arakapas Fault was created and welded to the Limassol Forest when the transform became a fracture zone.
Persistent Identifierhttp://hdl.handle.net/10722/44695
ISSN
2015 Impact Factor: 2.473
2015 SCImago Journal Rankings: 1.449
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCann, JRen_HK
dc.contributor.authorPrichard, HMen_HK
dc.contributor.authorMalpas, JGen_HK
dc.contributor.authorXenophontos, Cen_HK
dc.date.accessioned2007-10-30T06:07:58Z-
dc.date.available2007-10-30T06:07:58Z-
dc.date.issued2001en_HK
dc.identifier.citationJournal Of The Geological Society, 2001, v. 158 n. 5, p. 757-767en_HK
dc.identifier.issn0016-7649en_HK
dc.identifier.urihttp://hdl.handle.net/10722/44695-
dc.description.abstractFlat-lying extensional detachment faults have been imaged in the inside corner regions of ridge-transform intersections on the Mid-Atlantic Ridge. Exposed detachment surfaces are 10 km or more across, and are corrugated in the direction of spreading, as are continental detachments. Beneath the detachments lie core complexes of peridotite and gabbro; these are overlain by blocks of crustal material. We argue here that similar detachments are an essential component of the Limassol Forest area of the Troodos ophiolite in Cyprus, which lies south of the Arakapas Fault zone, previously recognized as a palaco-transform fault, and here interpreted as a transform fault that evolved into a fracture zone. In the Limassol Forest, core complexes of mantle peridotite can be shown to have been exposed at the sea floor, or to have been covered by overlapping crustal blocks, separated from the peridotite core and from each other by low-angle extensional faults. The extension can be shown to have occured shortly after crustal construction, and the already extended terrain was then intruded by swarms of dykes and plutons. We interpret these relations as arising when crust is constructed in an inside corner area, extended by detachment faulting, deformed further during slip along the transform, and then intruded by new magma as it passes the second spreading centre. The structurally deeper parts of the crustal blocks that overlie the detachment lie broadly towards the west, indicating that the spreading axis lay in that direction. The ophiolite north of the transform is much less extended, and we interpret this as a section of outside corner crust. In this interpretation, the Troodos ophiolite formed to the east (in its current orientation) of a ridge-transform-ridge intersection, in which the transform had a dextral offset and sinistral slip. The part of the ophiolite that forms the Limassol Forest was produced at the western inside corner, and spread eastward until it passed the second spreading axis, at which point the ophiolite north of the Arakapas Fault was created and welded to the Limassol Forest when the transform became a fracture zone.en_HK
dc.format.extent2517252 bytes-
dc.format.extent3083 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/gsl/publications/journals/jgsen_HK
dc.relation.ispartofJournal of the Geological Societyen_HK
dc.rightsJournal of Geological Society. Copyright © Geological Society Publishing House.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectDetachment faultsen_HK
dc.subjectMetamorphic core complexesen_HK
dc.subjectTransform faultsen_HK
dc.subjectTroodos ophioliteen_HK
dc.titleOceanic inside corner detachments of the Limassol Forest area, Troodos ophiolite, Cyprusen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0016-7649&volume=158&issue=5&spage=757&epage=767&date=2001&atitle=Oceanic+inside+corner+detachments+of+the+Limassol+Forest+area,+Troodos+ophiolite,+Cyprusen_HK
dc.identifier.emailMalpas, JG: jgmalpas@hku.hken_HK
dc.identifier.authorityMalpas, JG=rp00059en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1144/0016-764900-143en_HK
dc.identifier.hkuros73754-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034772427&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume158en_HK
dc.identifier.issue5en_HK
dc.identifier.spage757en_HK
dc.identifier.epage767en_HK
dc.identifier.isiWOS:000171734900004-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCann, JR=7005433416en_HK
dc.identifier.scopusauthoridPrichard, HM=35565229600en_HK
dc.identifier.scopusauthoridMalpas, JG=7006136845en_HK
dc.identifier.scopusauthoridXenophontos, C=6701391872en_HK

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