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Article: Timing of subduction zone metamorphism during the formation and emplacement of Troodos and Baer-Bassit ophiolites: Insights from 40Ar-39Ar geochronology

TitleTiming of subduction zone metamorphism during the formation and emplacement of Troodos and Baer-Bassit ophiolites: Insights from 40Ar-39Ar geochronology
Authors
Keywords40Ar-39Ar.
Ayia Varvara
Baer-Bassit Ophiolite
Troodos Ophiolite
Issue Date2007
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
Citation
Geological Magazine, 2007, v. 144 n. 5, p. 797-810 How to Cite?
AbstractThe Troodos ophiolite in Cyprus and Baer-Bassit ophiolite in Syria together form part of the Tethyan ophiolite belt. They were generated in a supra-subduction zone setting in Late Cretaceous times. As with many of the ophiolite occurrences in this belt, the sequences are closely associated with tectonic 'coloured mélange' zones, which contain, among a variety of lithologies, metre- to kilometre-size blocks of metamorphic rocks. Precise 40Ar-39Ar laser step-heating experiments performed on four amphibolites from SW Cyprus and six from NW Syria, yield plateau ages ranging from 75.7 ± 0.3 Ma to 88.9 ± 0.8 Ma in Cyprus and 71.7 ± 0.5 to 88.4 ± 0.4 Ma in Syria. The older limits of these time spans are coeval with the age of the formation of the associated ophiolites. Unlike other metamorphic sole rocks which seem to form in relatively short time spans, these metamorphic rocks found in Cyprus and Syria are interpreted to have formed in Late Cretaceous times by accretion below the overriding Troodos and Baer-Bassit crust for a period of 15-18 Ma. The metamorphic complexes were exhumed by extension and crustal thinning associated with subduction roll-back and the rotation of the overriding plate until the cessation of subduction in Maastrichtian times. In Cyprus, the exhumed metamorphic complex was incorporated into an accretionary prism constructed primarily of the collapsed Mamonia passive margin sequence intercalated with rocks of the Troodos ophiolite during plate collision in the Maastrichtian. Concomitantly, in Syria, the Baer-Bassit ophiolite and subcreted metamorphic complex were emplaced onto the Arabian passive margin and fragmented into blocks and knockers, forming the Baer-Bassit mélange.
Persistent Identifierhttp://hdl.handle.net/10722/178229
ISSN
2015 Impact Factor: 1.863
2015 SCImago Journal Rankings: 1.119
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChan, GHNen_US
dc.contributor.authorMalpas, Jen_US
dc.contributor.authorXenophontos, Cen_US
dc.contributor.authorLo, CHen_US
dc.date.accessioned2012-12-19T09:43:33Z-
dc.date.available2012-12-19T09:43:33Z-
dc.date.issued2007en_US
dc.identifier.citationGeological Magazine, 2007, v. 144 n. 5, p. 797-810en_US
dc.identifier.issn0016-7568en_US
dc.identifier.urihttp://hdl.handle.net/10722/178229-
dc.description.abstractThe Troodos ophiolite in Cyprus and Baer-Bassit ophiolite in Syria together form part of the Tethyan ophiolite belt. They were generated in a supra-subduction zone setting in Late Cretaceous times. As with many of the ophiolite occurrences in this belt, the sequences are closely associated with tectonic 'coloured mélange' zones, which contain, among a variety of lithologies, metre- to kilometre-size blocks of metamorphic rocks. Precise 40Ar-39Ar laser step-heating experiments performed on four amphibolites from SW Cyprus and six from NW Syria, yield plateau ages ranging from 75.7 ± 0.3 Ma to 88.9 ± 0.8 Ma in Cyprus and 71.7 ± 0.5 to 88.4 ± 0.4 Ma in Syria. The older limits of these time spans are coeval with the age of the formation of the associated ophiolites. Unlike other metamorphic sole rocks which seem to form in relatively short time spans, these metamorphic rocks found in Cyprus and Syria are interpreted to have formed in Late Cretaceous times by accretion below the overriding Troodos and Baer-Bassit crust for a period of 15-18 Ma. The metamorphic complexes were exhumed by extension and crustal thinning associated with subduction roll-back and the rotation of the overriding plate until the cessation of subduction in Maastrichtian times. In Cyprus, the exhumed metamorphic complex was incorporated into an accretionary prism constructed primarily of the collapsed Mamonia passive margin sequence intercalated with rocks of the Troodos ophiolite during plate collision in the Maastrichtian. Concomitantly, in Syria, the Baer-Bassit ophiolite and subcreted metamorphic complex were emplaced onto the Arabian passive margin and fragmented into blocks and knockers, forming the Baer-Bassit mélange.en_US
dc.languageengen_US
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEOen_US
dc.relation.ispartofGeological Magazineen_US
dc.subject40Ar-39Ar.en_US
dc.subjectAyia Varvaraen_US
dc.subjectBaer-Bassit Ophioliteen_US
dc.subjectTroodos Ophioliteen_US
dc.titleTiming of subduction zone metamorphism during the formation and emplacement of Troodos and Baer-Bassit ophiolites: Insights from 40Ar-39Ar geochronologyen_US
dc.typeArticleen_US
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_US
dc.identifier.authorityMalpas, J=rp00059en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1017/S0016756807003792en_US
dc.identifier.scopuseid_2-s2.0-34548450808en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34548450808&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume144en_US
dc.identifier.issue5en_US
dc.identifier.spage797en_US
dc.identifier.epage810en_US
dc.identifier.isiWOS:000250071400003-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridChan, GHN=20733736600en_US
dc.identifier.scopusauthoridMalpas, J=7006136845en_US
dc.identifier.scopusauthoridXenophontos, C=6701391872en_US
dc.identifier.scopusauthoridLo, CH=7401771288en_US

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