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Article: Exhumation P-T path of UHP eclogites in the Hong'an area, western Dabie Mountains, China

TitleExhumation P-T path of UHP eclogites in the Hong'an area, western Dabie Mountains, China
Authors
KeywordsCoesite
Eclogite
Exhumation
P-T path
The Dabie Mountains
UHP metamorphism
Issue Date2006
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2006, v. 89 n. 1-2, p. 154-173 How to Cite?
AbstractFour generations of mineral assemblages have been identified in ultrahigh-pressure (UHP) eclogites from the Hong'an area, recording four metamorphic stages of the exhumation trajectory, i.e., garnet + omphacite + kyanite+ zoisite/epidote + rutile + coesite formed at the UHP stage, garnet + omphacite + paragonite + phengite + amphibole + epidote + quartz at the high-pressure (HP) eclogitic stage, amphibole + epidote + albite-oligoclase + paragonite + quartz at the epidote-amphibolite facies (EA) stage, and actinolite+ albite and pumpellyite + albite + K-feldspar + muscovite + chlorite + margarite + epidote + quartz at the greenschist facies (GS) stage. Garnet formed at the UHP stage was overgrown by atoll garnet at the HP stage. X-ray images, mineral compositions and compositional profiles indicate that the UHP garnet experienced a variable Fe-Mg modification in response to Fe-Mg exchange between garnet and omphacite prior to the overgrowth of atoll HP garnet. A volume diffusion zone was also observed between the UHP and HP garnets. The following P-T conditions were estimated for these mineral assemblages: 480 to 560 °C and 2.5 to 2.9 GPa with median values of 520 °C and 2.8 GPa at UHP stage, 575 to 685 °C and 1.6 to 1.9 GPa with the average results of 634 ± 37 °C and 1.8 ± 0.06 GPa at the HP stage, 500 to 640 °C and 0.4 to 1 GPa at the EA stage, and 160 to 320 °C and 0.2 to 0.8 GPa at the GS stage. The Hong'an UHP eclogites experienced a temperature increase of over 100 °C from the UHP to HP stages and continued to exhume from the HP to EA stages through a process of approximately isothermal depression, which was followed by a significantly cooling from the EA to GS stages. In the process of exhumation, UHP eclogites witnessed a series of events involving fluid influx, resulting in the formation of hydrous minerals at different stages. The nature of fluids changed from K-rich at the HP stage to K-poor at the EA stage and then K-rich again at the GS stage. © 2005 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72661
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Jen_HK
dc.contributor.authorYe, Ken_HK
dc.contributor.authorSun, Men_HK
dc.date.accessioned2010-09-06T06:43:55Z-
dc.date.available2010-09-06T06:43:55Z-
dc.date.issued2006en_HK
dc.identifier.citationLithos, 2006, v. 89 n. 1-2, p. 154-173en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72661-
dc.description.abstractFour generations of mineral assemblages have been identified in ultrahigh-pressure (UHP) eclogites from the Hong'an area, recording four metamorphic stages of the exhumation trajectory, i.e., garnet + omphacite + kyanite+ zoisite/epidote + rutile + coesite formed at the UHP stage, garnet + omphacite + paragonite + phengite + amphibole + epidote + quartz at the high-pressure (HP) eclogitic stage, amphibole + epidote + albite-oligoclase + paragonite + quartz at the epidote-amphibolite facies (EA) stage, and actinolite+ albite and pumpellyite + albite + K-feldspar + muscovite + chlorite + margarite + epidote + quartz at the greenschist facies (GS) stage. Garnet formed at the UHP stage was overgrown by atoll garnet at the HP stage. X-ray images, mineral compositions and compositional profiles indicate that the UHP garnet experienced a variable Fe-Mg modification in response to Fe-Mg exchange between garnet and omphacite prior to the overgrowth of atoll HP garnet. A volume diffusion zone was also observed between the UHP and HP garnets. The following P-T conditions were estimated for these mineral assemblages: 480 to 560 °C and 2.5 to 2.9 GPa with median values of 520 °C and 2.8 GPa at UHP stage, 575 to 685 °C and 1.6 to 1.9 GPa with the average results of 634 ± 37 °C and 1.8 ± 0.06 GPa at the HP stage, 500 to 640 °C and 0.4 to 1 GPa at the EA stage, and 160 to 320 °C and 0.2 to 0.8 GPa at the GS stage. The Hong'an UHP eclogites experienced a temperature increase of over 100 °C from the UHP to HP stages and continued to exhume from the HP to EA stages through a process of approximately isothermal depression, which was followed by a significantly cooling from the EA to GS stages. In the process of exhumation, UHP eclogites witnessed a series of events involving fluid influx, resulting in the formation of hydrous minerals at different stages. The nature of fluids changed from K-rich at the HP stage to K-poor at the EA stage and then K-rich again at the GS stage. © 2005 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.en_HK
dc.subjectCoesiteen_HK
dc.subjectEclogiteen_HK
dc.subjectExhumationen_HK
dc.subjectP-T pathen_HK
dc.subjectThe Dabie Mountainsen_HK
dc.subjectUHP metamorphismen_HK
dc.titleExhumation P-T path of UHP eclogites in the Hong'an area, western Dabie Mountains, Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=89&spage=154&epage=173.&date=2006&atitle=Exhumation+P-T+path+of+UHP+eclogites+in+the+Hong%27an+area,+western+Dabie+Mountains,+China.en_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2005.12.002en_HK
dc.identifier.scopuseid_2-s2.0-33646872039en_HK
dc.identifier.hkuros127647en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33646872039&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume89en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage154en_HK
dc.identifier.epage173en_HK
dc.identifier.isiWOS:000238476100008-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLiu, J=27170233100en_HK
dc.identifier.scopusauthoridYe, K=7102173832en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK

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