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Article: Oxygen isotope composition of granulites from Dabieshan in Eastern China and its implications for geodynamics of Yangtze plate subduction

TitleOxygen isotope composition of granulites from Dabieshan in Eastern China and its implications for geodynamics of Yangtze plate subduction
Authors
Issue Date2001
Citation
Physics And Chemistry Of The Earth, Part A: Solid Earth And Geodesy, 2001, v. 26 n. 9-10, p. 673-684 How to Cite?
AbstractThe oxygen isotope composition of whole-rock and mineral separates was measured for granulite rocks from Dabieshan. According to their whole-rock δ18O values relative to the normal mantle δ18O values of 5.7±0.5‰, two groups are classified: (1) mafic granulite which exhibits lower δ18O values of 3.5 to 4.7‰, and (2) felsic granulite which shows higher δ18O values of 7.6 to 7.8‰. Consistent isotope temperatures of 800 to 900°C are obtained for mineral pairs containing such refractory minerals as pyroxene, garnet, hornblende and iron oxides, suggesting the achievement and preservation of oxygen isotope equilibrium at the conditions of the peak granulite-facies metamorphism. This not only points to a rapid cooling and ascent for the granulite rocks in the early stage of exhumation, but also precludes the infiltration of external fluids during exhumation as the cause for the 18O-depletion in the mafic granulite. It is evident that the granulite rocks acquired the low δ18O values before the granulite-facies metamorphism by interaction with a certain 18O-depleted surface fluid. The surface fluid is assumed to exchange oxygen isotopes with the granulite protoliths prior to plate subduction. Fluid-absent metamorphism is suggested for the formation of the granulites on local scales. It is likely that the granulites together with the ultrahigh pressure eclogites and gneisses in Dabieshan were part of a single tectonic entity in the processes of subduction and Triassic metamorphism but experienced differential two-stage uplifts prior to amphibolite-facies retrogression. © 2001 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151049
ISSN
2003 Impact Factor: 1.197
2004 SCImago Journal Rankings: 0.854
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZheng, YFen_US
dc.contributor.authorFu, Ben_US
dc.contributor.authorLi, YLen_US
dc.contributor.authorWei, CSen_US
dc.contributor.authorZhou, JBen_US
dc.date.accessioned2012-06-26T06:16:30Z-
dc.date.available2012-06-26T06:16:30Z-
dc.date.issued2001en_US
dc.identifier.citationPhysics And Chemistry Of The Earth, Part A: Solid Earth And Geodesy, 2001, v. 26 n. 9-10, p. 673-684en_US
dc.identifier.issn1464-1895en_US
dc.identifier.urihttp://hdl.handle.net/10722/151049-
dc.description.abstractThe oxygen isotope composition of whole-rock and mineral separates was measured for granulite rocks from Dabieshan. According to their whole-rock δ18O values relative to the normal mantle δ18O values of 5.7±0.5‰, two groups are classified: (1) mafic granulite which exhibits lower δ18O values of 3.5 to 4.7‰, and (2) felsic granulite which shows higher δ18O values of 7.6 to 7.8‰. Consistent isotope temperatures of 800 to 900°C are obtained for mineral pairs containing such refractory minerals as pyroxene, garnet, hornblende and iron oxides, suggesting the achievement and preservation of oxygen isotope equilibrium at the conditions of the peak granulite-facies metamorphism. This not only points to a rapid cooling and ascent for the granulite rocks in the early stage of exhumation, but also precludes the infiltration of external fluids during exhumation as the cause for the 18O-depletion in the mafic granulite. It is evident that the granulite rocks acquired the low δ18O values before the granulite-facies metamorphism by interaction with a certain 18O-depleted surface fluid. The surface fluid is assumed to exchange oxygen isotopes with the granulite protoliths prior to plate subduction. Fluid-absent metamorphism is suggested for the formation of the granulites on local scales. It is likely that the granulites together with the ultrahigh pressure eclogites and gneisses in Dabieshan were part of a single tectonic entity in the processes of subduction and Triassic metamorphism but experienced differential two-stage uplifts prior to amphibolite-facies retrogression. © 2001 Elsevier Science Ltd. All rights reserved.en_US
dc.languageengen_US
dc.relation.ispartofPhysics and Chemistry of the Earth, Part A: Solid Earth and Geodesyen_US
dc.titleOxygen isotope composition of granulites from Dabieshan in Eastern China and its implications for geodynamics of Yangtze plate subductionen_US
dc.typeArticleen_US
dc.identifier.emailLi, YL:yiliang@hkucc.hku.hken_US
dc.identifier.authorityLi, YL=rp01354en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S1464-1895(01)00118-1en_US
dc.identifier.scopuseid_2-s2.0-0034857367en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034857367&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume26en_US
dc.identifier.issue9-10en_US
dc.identifier.spage673en_US
dc.identifier.epage684en_US
dc.identifier.isiWOS:000171606900003-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridZheng, YF=7404838286en_US
dc.identifier.scopusauthoridFu, B=35960736900en_US
dc.identifier.scopusauthoridLi, YL=27171876700en_US
dc.identifier.scopusauthoridWei, CS=7401657950en_US
dc.identifier.scopusauthoridZhou, JB=7405547094en_US

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