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Article: Geochemical evolution within a Devonian intra-oceanic island arc: The Gamilaroi terrane, southern New England orogen, Australia

TitleGeochemical evolution within a Devonian intra-oceanic island arc: The Gamilaroi terrane, southern New England orogen, Australia
Authors
KeywordsDevonian
Gamilaroi terrane
Geochemistry
Island arc
New England orogen
Issue Date1997
PublisherBlackwell Publishing Asia. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IAR
Citation
Island Arc, 1997, v. 6 n. 2, p. 213-227 How to Cite?
AbstractGeochemical analyses of volcanic rocks in the Gamilaroi terrane reveal several phases of arc activity within an intra-oceanic island-arc terrane. Felsic volcanic rocks at the base of the section have rare earth element (REE) and trace element compositions which indicate that they were derived from an island-arc source. Basalts immediately overlying the felsic volcanic rocks have a distinctive geochemical signature with low levels of Ti and Y and high levels of Ni, Cr and Mg. Low concentrations of REE and trace elements relative to mid-ocean-ridge basalts (MORB) indicate that they were also derived from an intra-oceanic island-arc source. Extensive basalts and basaltic and andesites among the youngest rocks of the terrane have typically flat to enriched REE and trace element compositions, indicating a transitional arc-back-arc source. The change in basalt compositions indicates that rifting had occurred by this stage in the evolution of the arc. Confirmation of an intra-oceanic setting for this terrane enables a more detailed comparison with similar intra-oceanic rocks in the northern New England orogen. This study of the Gamilaroi terrane is an example of the potential use of geochemical data to identify other ancient intra-oceanic island-arc-rift suites.
Persistent Identifierhttp://hdl.handle.net/10722/72501
ISSN
2015 Impact Factor: 1.397
2015 SCImago Journal Rankings: 0.823
References

 

DC FieldValueLanguage
dc.contributor.authorStratford, JMCen_HK
dc.contributor.authorAitchison, JCen_HK
dc.date.accessioned2010-09-06T06:42:26Z-
dc.date.available2010-09-06T06:42:26Z-
dc.date.issued1997en_HK
dc.identifier.citationIsland Arc, 1997, v. 6 n. 2, p. 213-227en_HK
dc.identifier.issn1038-4871en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72501-
dc.description.abstractGeochemical analyses of volcanic rocks in the Gamilaroi terrane reveal several phases of arc activity within an intra-oceanic island-arc terrane. Felsic volcanic rocks at the base of the section have rare earth element (REE) and trace element compositions which indicate that they were derived from an island-arc source. Basalts immediately overlying the felsic volcanic rocks have a distinctive geochemical signature with low levels of Ti and Y and high levels of Ni, Cr and Mg. Low concentrations of REE and trace elements relative to mid-ocean-ridge basalts (MORB) indicate that they were also derived from an intra-oceanic island-arc source. Extensive basalts and basaltic and andesites among the youngest rocks of the terrane have typically flat to enriched REE and trace element compositions, indicating a transitional arc-back-arc source. The change in basalt compositions indicates that rifting had occurred by this stage in the evolution of the arc. Confirmation of an intra-oceanic setting for this terrane enables a more detailed comparison with similar intra-oceanic rocks in the northern New England orogen. This study of the Gamilaroi terrane is an example of the potential use of geochemical data to identify other ancient intra-oceanic island-arc-rift suites.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Asia. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IARen_HK
dc.relation.ispartofIsland Arcen_HK
dc.subjectDevonianen_HK
dc.subjectGamilaroi terraneen_HK
dc.subjectGeochemistryen_HK
dc.subjectIsland arcen_HK
dc.subjectNew England orogenen_HK
dc.titleGeochemical evolution within a Devonian intra-oceanic island arc: The Gamilaroi terrane, southern New England orogen, Australiaen_HK
dc.typeArticleen_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-s2.0-0031457615en_HK
dc.identifier.hkuros34578en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031457615&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume6en_HK
dc.identifier.issue2en_HK
dc.identifier.spage213en_HK
dc.identifier.epage227en_HK
dc.publisher.placeAustraliaen_HK
dc.identifier.scopusauthoridStratford, JMC=7004570510en_HK
dc.identifier.scopusauthoridAitchison, JC=7102533858en_HK

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