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Article: Eclogites and blueschists of the Pam Peninsula, NE New Caledonia: A reappraisal

TitleEclogites and blueschists of the Pam Peninsula, NE New Caledonia: A reappraisal
Authors
KeywordsBlueschist
Eclogite
High-P metamorphism
New Caledonia
Thermobarometry
Issue Date1997
PublisherOxford University Press. The Journal's web site is located at http://petrology.oxfordjournals.org/
Citation
Journal Of Petrology, 1997, v. 38 n. 7, p. 843-876 How to Cite?
AbstractHigh-P rocks of the Pam Peninsula, NE New Caledonia, are divided into three zones: (1) an uppermost ferroglaucophane-lawsonite zone of Cretaceous to Eocene metasediments and metavolcanics of the Diahot terrane that experienced peak conditions involving P=7-9 kbar and T=400±58°C; (2) albite-epidote-omphacite zone Diahot terrane rocks that experienced blueschist facies conditions of P=12·6±1·2 kbar and T=570±36°C; (3) lowermost metabasic eclogites of uncertain age that form the Pouébo terrane, which experienced high-P conditions of P=23·9±3·0 kbar and T∼600°C. Eclogite occurs as metre- to kilometre-scale pods in coarse grained hydrous mineral-rich 'glaucophanite' formed during hydration and decompression of the Pouébo terrane. Metamorphism and deformation were consequent to 44-51 Ma Eocene convergence, when sedimentary and ophiolitic nappes were thrust over the eclogites in a SW direction; white mica ages constrain metamorphism to have ended by 37±1 Ma. Large steps in metamorphic grade are coincident with SW-dipping and NE-dipping faults that separate the three zones and were formed during two stages: (1) comparatively slow uplift and hydration of the Pouébo terrane before it was juxtaposed with the albite-epidote-omphacite zone at P∼14 kbar; (2) comparatively rapid uplift of both the Pouébo terrane and the albite-epidote-omphacite zone to form a domal core of eclogite flanked by significantly lower-grade rocks to the SW and NE.
Persistent Identifierhttp://hdl.handle.net/10722/72568
ISSN
2015 Impact Factor: 3.768
2015 SCImago Journal Rankings: 2.992
References

 

DC FieldValueLanguage
dc.contributor.authorClarke, GLen_HK
dc.contributor.authorAitchison, JCen_HK
dc.contributor.authorCluzel, Den_HK
dc.date.accessioned2010-09-06T06:43:03Z-
dc.date.available2010-09-06T06:43:03Z-
dc.date.issued1997en_HK
dc.identifier.citationJournal Of Petrology, 1997, v. 38 n. 7, p. 843-876en_HK
dc.identifier.issn0022-3530en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72568-
dc.description.abstractHigh-P rocks of the Pam Peninsula, NE New Caledonia, are divided into three zones: (1) an uppermost ferroglaucophane-lawsonite zone of Cretaceous to Eocene metasediments and metavolcanics of the Diahot terrane that experienced peak conditions involving P=7-9 kbar and T=400±58°C; (2) albite-epidote-omphacite zone Diahot terrane rocks that experienced blueschist facies conditions of P=12·6±1·2 kbar and T=570±36°C; (3) lowermost metabasic eclogites of uncertain age that form the Pouébo terrane, which experienced high-P conditions of P=23·9±3·0 kbar and T∼600°C. Eclogite occurs as metre- to kilometre-scale pods in coarse grained hydrous mineral-rich 'glaucophanite' formed during hydration and decompression of the Pouébo terrane. Metamorphism and deformation were consequent to 44-51 Ma Eocene convergence, when sedimentary and ophiolitic nappes were thrust over the eclogites in a SW direction; white mica ages constrain metamorphism to have ended by 37±1 Ma. Large steps in metamorphic grade are coincident with SW-dipping and NE-dipping faults that separate the three zones and were formed during two stages: (1) comparatively slow uplift and hydration of the Pouébo terrane before it was juxtaposed with the albite-epidote-omphacite zone at P∼14 kbar; (2) comparatively rapid uplift of both the Pouébo terrane and the albite-epidote-omphacite zone to form a domal core of eclogite flanked by significantly lower-grade rocks to the SW and NE.en_HK
dc.languageengen_HK
dc.publisherOxford University Press. The Journal's web site is located at http://petrology.oxfordjournals.org/en_HK
dc.relation.ispartofJournal of Petrologyen_HK
dc.rightsJournal of Petrology. Copyright © Oxford University Press.en_HK
dc.subjectBlueschisten_HK
dc.subjectEclogiteen_HK
dc.subjectHigh-P metamorphismen_HK
dc.subjectNew Caledoniaen_HK
dc.subjectThermobarometryen_HK
dc.titleEclogites and blueschists of the Pam Peninsula, NE New Caledonia: A reappraisalen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-3530&volume=36&spage=843&epage=876&date=1997&atitle=Eclogites+and+blueschists+of+the+Pam+Peninsula,+NE+New+Caledonia:+a+reappraisalen_HK
dc.identifier.emailAitchison, JC: jona@hku.hken_HK
dc.identifier.authorityAitchison, JC=rp00658en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0031434785en_HK
dc.identifier.hkuros34566en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031434785&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue7en_HK
dc.identifier.spage843en_HK
dc.identifier.epage876en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridClarke, GL=34967848500en_HK
dc.identifier.scopusauthoridAitchison, JC=7102533858en_HK
dc.identifier.scopusauthoridCluzel, D=6701533022en_HK

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