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Article: Early Cretaceous volcanism of the Coastal Ranges, NW Syria: Magma genesis and regional dynamics

TitleEarly Cretaceous volcanism of the Coastal Ranges, NW Syria: Magma genesis and regional dynamics
Authors
Keywords40Ar/ 39Ar Dating
Hornblendite
Levant Magmatism
Lithospheric Mantle
Metasomatism
Rifting
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2011, v. 126 n. 3-4, p. 290-306 How to Cite?
AbstractEarly Cretaceous volcanism in the present Coastal Ranges, NW Syria, dated at 106.3±0.2Ma and 103.4±0.3Ma (bulk-rock 40Ar/ 39Ar ages), represents the last instance of Mesozoic intraplate magmatism in the Levant region. On the basis of the petrography and chemistry of the lavas, the rocks can be divided into an ankaramite series and a transitional basalt series, which exhibit distinct isotopic compositions (ankaramites: εNd (t)=5.1-5.6, 87Sr/ 87Sr (t)=0.70293-0.70302, 187Os/ 188Os (t)=0.227-0.242; transitional basalts: εNd (t)=4.0-4.6, 87Sr/ 87Sr (t)=0.70320-0.70424, 187Os/ 188Os (t)=0.392). Fractional crystallisation and assimilation-fractional crystallisation modelling suggests minor roles for both processes, despite the generally high Os isotopic ratios and excepting that the ankaramites experienced small amounts of olivine, clinopyroxene and rare Cr-spinel fractionation. The modelling also precludes derivation of one lava series from the other, suggesting that the isotopic distinction as well as other chemical distinction between the ankaramites (lower SiO 2, higher TiO 2, Nb/U, Nb/Th, Nb/La and Ce/Pb) and the transitional basalts must be inherited from the source. It is interpreted that these chemical characteristics represent a significant component derived from metasomatic amphibole-rich veins in the source region. Both the ankaramites and transitional basalts were generated from this source which contained veins of metasomatic cumulates in a peridotitic host. A contribution from deeper mantle sources or an anomalously hot mantle (e.g. arrival of a mantle plume) is not required to explain the data, which is better considered a result of melting of a metasomatically hydrated lithospheric mantle at relatively low temperatures during times of Levant regional extension. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/178244
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMa, GSKen_US
dc.contributor.authorMalpas, Jen_US
dc.contributor.authorXenophontos, Cen_US
dc.contributor.authorSuzuki, Ken_US
dc.contributor.authorLo, CHen_US
dc.date.accessioned2012-12-19T09:43:51Z-
dc.date.available2012-12-19T09:43:51Z-
dc.date.issued2011en_US
dc.identifier.citationLithos, 2011, v. 126 n. 3-4, p. 290-306en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/178244-
dc.description.abstractEarly Cretaceous volcanism in the present Coastal Ranges, NW Syria, dated at 106.3±0.2Ma and 103.4±0.3Ma (bulk-rock 40Ar/ 39Ar ages), represents the last instance of Mesozoic intraplate magmatism in the Levant region. On the basis of the petrography and chemistry of the lavas, the rocks can be divided into an ankaramite series and a transitional basalt series, which exhibit distinct isotopic compositions (ankaramites: εNd (t)=5.1-5.6, 87Sr/ 87Sr (t)=0.70293-0.70302, 187Os/ 188Os (t)=0.227-0.242; transitional basalts: εNd (t)=4.0-4.6, 87Sr/ 87Sr (t)=0.70320-0.70424, 187Os/ 188Os (t)=0.392). Fractional crystallisation and assimilation-fractional crystallisation modelling suggests minor roles for both processes, despite the generally high Os isotopic ratios and excepting that the ankaramites experienced small amounts of olivine, clinopyroxene and rare Cr-spinel fractionation. The modelling also precludes derivation of one lava series from the other, suggesting that the isotopic distinction as well as other chemical distinction between the ankaramites (lower SiO 2, higher TiO 2, Nb/U, Nb/Th, Nb/La and Ce/Pb) and the transitional basalts must be inherited from the source. It is interpreted that these chemical characteristics represent a significant component derived from metasomatic amphibole-rich veins in the source region. Both the ankaramites and transitional basalts were generated from this source which contained veins of metasomatic cumulates in a peridotitic host. A contribution from deeper mantle sources or an anomalously hot mantle (e.g. arrival of a mantle plume) is not required to explain the data, which is better considered a result of melting of a metasomatically hydrated lithospheric mantle at relatively low temperatures during times of Levant regional extension. © 2011 Elsevier B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_US
dc.relation.ispartofLithosen_US
dc.subject40Ar/ 39Ar Datingen_US
dc.subjectHornblenditeen_US
dc.subjectLevant Magmatismen_US
dc.subjectLithospheric Mantleen_US
dc.subjectMetasomatismen_US
dc.subjectRiftingen_US
dc.titleEarly Cretaceous volcanism of the Coastal Ranges, NW Syria: Magma genesis and regional dynamicsen_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.doi10.1016/j.lithos.2011.07.025en_US
dc.identifier.scopuseid_2-s2.0-80054037037en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80054037037&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume126en_US
dc.identifier.issue3-4en_US
dc.identifier.spage290en_US
dc.identifier.epage306en_US
dc.identifier.isiWOS:000296822900012-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridMa, GSK=36863809900en_US
dc.identifier.scopusauthoridMalpas, J=7006136845en_US
dc.identifier.scopusauthoridXenophontos, C=6701391872en_US
dc.identifier.scopusauthoridSuzuki, K=7501776651en_US
dc.identifier.scopusauthoridLo, CH=35078881900en_US
dc.identifier.citeulike9824270-

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