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Article: Metamorphic P-T path and implications of high-pressure pelitic granulites from the Jiaobei massif in the Jiao-Liao-Ji Belt, North China Craton

TitleMetamorphic P-T path and implications of high-pressure pelitic granulites from the Jiaobei massif in the Jiao-Liao-Ji Belt, North China Craton
Authors
KeywordsHigh-Pressure Pelitic Granulites
Jiao-Liao-Ji Belt
North China Craton
P-T Path
Paleoproterozoic
Petrology
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2012, v. 22 n. 1, p. 104-117 How to Cite?
AbstractHigh-pressure pelitic granulites have recently been found from the Jiaobei massif in the southern segment of the Jiao-Liao-Ji Belt (JLJB), which separates the Eastern Block of the North China Craton into the Longgang and Langrim Blocks. Petrological evidence from these high-pressure pelitic granulites indicates three distinct metamorphic stages (M1-M3). The pre-peak (M1) stage is represented by a mineral assemblage of garnet (core). +. inclusion-type minerals within the garnet (biotite. +. kyanite. +. muscovite. +. plagioclase. +. quartz. +. ilmenite). The peak (M2) stage is marked by a mineral assemblage of garnet (mantle). +. K-feldspar. +. kyanite. +. plagioclase. +. biotite. +. rutile. +. ilmenite. +. quartz. The post-peak (M3) stage is featured by a mineral assemblage of garnet (rim). +. sillimanite. +. plagioclase. +. biotite. +. ilmenite. +. quartz. Using the THERMOCALAC technique, the NCKFMASHTO system has been applied to construct pseudosections for a representative high-pressure pelitic granulite sample. P-T conditions for the M1, M2 and M3 stages are constrained at 9.3-10.7. kbar/645-670. °C, 14.8-16.2. kbar/860-890. °C, and 6.3-8.5. kbar/710-740. °C, respectively. The mineral assemblages and P-T conditions of the high-pressure pelitic granulites define a clockwise P-T path involving decompression and cooling following the peak high-pressure granulite facies metamorphism. This suggests that the high-pressure pelitic granulites experienced the initial crustal thickening (M1 and M2), followed by exhumation and cooling (M3), which implies that the southern segment of the JLJB must have been involved in subduction- or collision-related tectonic processes. Therefore, the JLJB may represent another Paleoproterozoic collisional belt along which the Longgang and Langrim Blocks amalgamated to form the Eastern Block. © 2011 International Association for Gondwana Research.
Persistent Identifierhttp://hdl.handle.net/10722/151362
ISSN
2015 Impact Factor: 8.743
2015 SCImago Journal Rankings: 4.949
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong RGC GRFHKU7057/08P
Chinese NSFC41072152
40730315
40872123
Funding Information:

This study was financially supported by the Hong Kong RGC GRF project (HKU7057/08P) and the Chinese NSFC Grants (41072152, 40730315 and 40872123). We thank two anonymous journal reviewers for their constructive comments. Special thanks are given to Mr. Allen Leung for great comments on constructing pseudosections, Dr. Mao Qian and Dr. Xia Qunke for helping the EPMA studies, and Dr. George Ma and Dr. Jean Wong for constructive and helpful discussion.

References

 

DC FieldValueLanguage
dc.contributor.authorTam, PYen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorZhou, Xen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorGuo, Jen_US
dc.contributor.authorLi, Sen_US
dc.contributor.authorYin, Cen_US
dc.contributor.authorWu, Men_US
dc.contributor.authorHe, Yen_US
dc.date.accessioned2012-06-26T06:21:10Z-
dc.date.available2012-06-26T06:21:10Z-
dc.date.issued2012en_US
dc.identifier.citationGondwana Research, 2012, v. 22 n. 1, p. 104-117en_US
dc.identifier.issn1342-937Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/151362-
dc.description.abstractHigh-pressure pelitic granulites have recently been found from the Jiaobei massif in the southern segment of the Jiao-Liao-Ji Belt (JLJB), which separates the Eastern Block of the North China Craton into the Longgang and Langrim Blocks. Petrological evidence from these high-pressure pelitic granulites indicates three distinct metamorphic stages (M1-M3). The pre-peak (M1) stage is represented by a mineral assemblage of garnet (core). +. inclusion-type minerals within the garnet (biotite. +. kyanite. +. muscovite. +. plagioclase. +. quartz. +. ilmenite). The peak (M2) stage is marked by a mineral assemblage of garnet (mantle). +. K-feldspar. +. kyanite. +. plagioclase. +. biotite. +. rutile. +. ilmenite. +. quartz. The post-peak (M3) stage is featured by a mineral assemblage of garnet (rim). +. sillimanite. +. plagioclase. +. biotite. +. ilmenite. +. quartz. Using the THERMOCALAC technique, the NCKFMASHTO system has been applied to construct pseudosections for a representative high-pressure pelitic granulite sample. P-T conditions for the M1, M2 and M3 stages are constrained at 9.3-10.7. kbar/645-670. °C, 14.8-16.2. kbar/860-890. °C, and 6.3-8.5. kbar/710-740. °C, respectively. The mineral assemblages and P-T conditions of the high-pressure pelitic granulites define a clockwise P-T path involving decompression and cooling following the peak high-pressure granulite facies metamorphism. This suggests that the high-pressure pelitic granulites experienced the initial crustal thickening (M1 and M2), followed by exhumation and cooling (M3), which implies that the southern segment of the JLJB must have been involved in subduction- or collision-related tectonic processes. Therefore, the JLJB may represent another Paleoproterozoic collisional belt along which the Longgang and Langrim Blocks amalgamated to form the Eastern Block. © 2011 International Association for Gondwana Research.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcren_US
dc.relation.ispartofGondwana Researchen_US
dc.subjectHigh-Pressure Pelitic Granulitesen_US
dc.subjectJiao-Liao-Ji Belten_US
dc.subjectNorth China Cratonen_US
dc.subjectP-T Pathen_US
dc.subjectPaleoproterozoicen_US
dc.subjectPetrologyen_US
dc.titleMetamorphic P-T path and implications of high-pressure pelitic granulites from the Jiaobei massif in the Jiao-Liao-Ji Belt, North China Cratonen_US
dc.typeArticleen_US
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_US
dc.identifier.emailZhou, X: zhouxw@hku.hken_US
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.authorityZhao, G=rp00842en_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.gr.2011.09.006en_US
dc.identifier.scopuseid_2-s2.0-84857634740en_US
dc.identifier.hkuros204259-
dc.identifier.hkuros219096-
dc.identifier.hkuros252290-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84857634740&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume22en_US
dc.identifier.issue1en_US
dc.identifier.spage104en_US
dc.identifier.epage117en_US
dc.identifier.isiWOS:000305106800008-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridTam, PY=49964607300en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridZhou, X=7410090761en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridGuo, J=35368525900en_US
dc.identifier.scopusauthoridLi, S=35248444400en_US
dc.identifier.scopusauthoridYin, C=16053843700en_US
dc.identifier.scopusauthoridWu, M=52664471800en_US
dc.identifier.scopusauthoridHe, Y=8678944900en_US
dc.identifier.citeulike10164713-

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