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Article: Magnetic properties of ultrahigh-pressure eclogites controlled by retrograde metamorphism: A case study from the ZK703 drillhole in Donghai, eastern China

TitleMagnetic properties of ultrahigh-pressure eclogites controlled by retrograde metamorphism: A case study from the ZK703 drillhole in Donghai, eastern China
Authors
KeywordsRetrograde metamorphism
Rock magnetism
Sulu orogen
Ultrahigh-pressure eclogite
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/pepi
Citation
Physics Of The Earth And Planetary Interiors, 2007, v. 160 n. 3-5, p. 181-191 How to Cite?
AbstractParallel studies on rock magnetic properties, petrology and mineralogy were conducted on 16 eclogite samples from the ZK703 hole and magnetic susceptibilities and densities of 41 eclogite samples with different degree of retrograde metamorphism (from fresh eclogite to fully-retrograded eclogite) from the Chinese Continental Scientific Drilling (CCSD) near the ZK703 hole, located at Donghai, southern Sulu ultrahigh-pressure metamorphic belt, eastern China. Results show: (1) that the high-field slopes obtained from the hysteresis loops (the paramagnetic fraction χ para) and density have a positive correlation with the volume concentration of garnet + omphacite, a typical mineral assemblage used to semi-quantify the degree of retrograde metamorphism. The low-field slopes obtained from hysteresis loops (the ferrimagnetic susceptibility fraction χ ferri), saturation isothermal remanent magnetization M rs and saturation magnetization M s have a positive correlation with the volume concentration of symplectite, a mineral related to retrograded metamorphism. Therefore they could be potential indicators for quickly semi-quantifying the degree of retrograde metamorphism of the eclogite units. (2) The dominant magnetic carriers in retrograded eclogites are magnetite particles in pseudo-single domain grain size region. (3) The P-T conditions during the retrograde (decompressional) process could first increase the concentration of magnetite, which can reach up to 3% for extensively retrograded eclogite and then was dissolved for fully-retrograded eclogite. Therefore, change in the magnetite contents during the retrograde process is the major factor controlling the magnetism of retrograde eclogites. © 2006.
Persistent Identifierhttp://hdl.handle.net/10722/72766
ISSN
2015 Impact Factor: 2.605
2015 SCImago Journal Rankings: 2.140
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Qen_HK
dc.contributor.authorLiu, Qen_HK
dc.contributor.authorZhang, Zen_HK
dc.contributor.authorXu, Hen_HK
dc.contributor.authorChan, Len_HK
dc.contributor.authorYang, Ten_HK
dc.contributor.authorJin, Zen_HK
dc.date.accessioned2010-09-06T06:44:54Z-
dc.date.available2010-09-06T06:44:54Z-
dc.date.issued2007en_HK
dc.identifier.citationPhysics Of The Earth And Planetary Interiors, 2007, v. 160 n. 3-5, p. 181-191en_HK
dc.identifier.issn0031-9201en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72766-
dc.description.abstractParallel studies on rock magnetic properties, petrology and mineralogy were conducted on 16 eclogite samples from the ZK703 hole and magnetic susceptibilities and densities of 41 eclogite samples with different degree of retrograde metamorphism (from fresh eclogite to fully-retrograded eclogite) from the Chinese Continental Scientific Drilling (CCSD) near the ZK703 hole, located at Donghai, southern Sulu ultrahigh-pressure metamorphic belt, eastern China. Results show: (1) that the high-field slopes obtained from the hysteresis loops (the paramagnetic fraction χ para) and density have a positive correlation with the volume concentration of garnet + omphacite, a typical mineral assemblage used to semi-quantify the degree of retrograde metamorphism. The low-field slopes obtained from hysteresis loops (the ferrimagnetic susceptibility fraction χ ferri), saturation isothermal remanent magnetization M rs and saturation magnetization M s have a positive correlation with the volume concentration of symplectite, a mineral related to retrograded metamorphism. Therefore they could be potential indicators for quickly semi-quantifying the degree of retrograde metamorphism of the eclogite units. (2) The dominant magnetic carriers in retrograded eclogites are magnetite particles in pseudo-single domain grain size region. (3) The P-T conditions during the retrograde (decompressional) process could first increase the concentration of magnetite, which can reach up to 3% for extensively retrograded eclogite and then was dissolved for fully-retrograded eclogite. Therefore, change in the magnetite contents during the retrograde process is the major factor controlling the magnetism of retrograde eclogites. © 2006.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/pepien_HK
dc.relation.ispartofPhysics of the Earth and Planetary Interiorsen_HK
dc.rightsPhysics of the Earth and Planetary Interiors . Copyright © Elsevier BV.en_HK
dc.subjectRetrograde metamorphismen_HK
dc.subjectRock magnetismen_HK
dc.subjectSulu orogenen_HK
dc.subjectUltrahigh-pressure eclogiteen_HK
dc.titleMagnetic properties of ultrahigh-pressure eclogites controlled by retrograde metamorphism: A case study from the ZK703 drillhole in Donghai, eastern Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0031-9201&volume=160 &spage=181–191&epage=&date=2007&atitle=Magnetic+Properties+Of+Ultrahigh-pressure+Eclogites+Controlled+By+Retrograde+Metamorphism:+A+Case+Study+From+The+Zk703+Drillhole+In+Donghai,+Eastern+Chinaen_HK
dc.identifier.emailChan, L:chanls@hku.hken_HK
dc.identifier.authorityChan, L=rp00665en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.pepi.2006.10.001en_HK
dc.identifier.scopuseid_2-s2.0-33846564456en_HK
dc.identifier.hkuros134769en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33846564456&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume160en_HK
dc.identifier.issue3-5en_HK
dc.identifier.spage181en_HK
dc.identifier.epage191en_HK
dc.identifier.isiWOS:000244572200001-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLiu, Q=8729121400en_HK
dc.identifier.scopusauthoridLiu, Q=7406293686en_HK
dc.identifier.scopusauthoridZhang, Z=9939613100en_HK
dc.identifier.scopusauthoridXu, H=7407449674en_HK
dc.identifier.scopusauthoridChan, L=7403540528en_HK
dc.identifier.scopusauthoridYang, T=9840350900en_HK
dc.identifier.scopusauthoridJin, Z=23485672000en_HK

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