File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Petrology and P-T path of the Yishui mafic granulites: Implications for tectonothermal evolution of the Western Shandong Complex in the Eastern Block of the North China Craton

TitlePetrology and P-T path of the Yishui mafic granulites: Implications for tectonothermal evolution of the Western Shandong Complex in the Eastern Block of the North China Craton
Authors
KeywordsLate Archean
Mafic Granulite
Metamorphism
North China Craton
P-T Path
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2012, v. 222-223, p. 312-324 How to Cite?
AbstractMafic granulites from the Yishui Group of the Western Shandong Complex in the Eastern Block of the North China Craton occur as enclaves or boudins within Late Archean TTG gneisses, and are composed mainly of garnet, clinopyroxene, orthopyroxene, plagioclase, hornblende, and minor quartz, ilmenite, and magnetite. Petrographic examination has revealed three distinct metamorphic mineral assemblages: the pre-peak prograde assemblage (M1) of hornblende + plagioclase + quartz + ilmenite + magnetite occurring as inclusions within garnet and pyroxene grains, peak assemblage (M2) of orthopyroxene + clinopyroxene + plagioclase + garnet + hornblende + quartz + ilmenite + magnetite, and post-peak assemblage (M3) represented by garnet + quartz and garnet + ilmenite/magnetite symplectites. Pseudosection modeling using THERMOCALC in the NCFMASHTO model system for a representative sample constrains the P-T conditions of M1, M2 and M3 stages at 660-730 °C/<6.6 kbar, 800-820 °C/8.0-8.5 kbar and 686-710 °C/7.6-8.6 kbar, respectively. The results of petrology and quantitative P-T pseudosection modeling define an anticlockwise P-T path involving near-isobaric cooling following the peak medium-pressure granulite-facies metamorphism, suggesting that the metamorphism of the Yishui Group was most likely related to the intrusion and underplating of mantle-derived magmas. Although the underplating of voluminous mantle-derived magmas leading to granulite-facies metamorphism with an anticlockwise P-T path involving isobaric cooling may occur in continental magmatic arc regions, above hot spots driven by mantle plumes, or in continental rift environments, a mantle plume model is favored because this model can reasonably interpret many other geological features of Late Archean basement rocks from the Western Shandong Complex in the Eastern Block of the North China Craton as well as their anticlockwise P-T paths involving isobaric cooling. The relatively cooler mantle-plume head heated the crust initially, causing amphibolite-facies metamorphism (M1). Subsequently, the relatively hotter mantle-plume tail heated the crust, causing granulite-facies metamorphism (M2). Finally, a near-isobaric cooling process (M3) occurred when the mantle plume ceased to heat the crust. © 2011 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151347
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWu, Men_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorYin, Cen_US
dc.contributor.authorLi, Sen_US
dc.contributor.authorTam, PYen_US
dc.date.accessioned2012-06-26T06:20:54Z-
dc.date.available2012-06-26T06:20:54Z-
dc.date.issued2012en_US
dc.identifier.citationPrecambrian Research, 2012, v. 222-223, p. 312-324en_US
dc.identifier.issn0301-9268en_US
dc.identifier.urihttp://hdl.handle.net/10722/151347-
dc.description.abstractMafic granulites from the Yishui Group of the Western Shandong Complex in the Eastern Block of the North China Craton occur as enclaves or boudins within Late Archean TTG gneisses, and are composed mainly of garnet, clinopyroxene, orthopyroxene, plagioclase, hornblende, and minor quartz, ilmenite, and magnetite. Petrographic examination has revealed three distinct metamorphic mineral assemblages: the pre-peak prograde assemblage (M1) of hornblende + plagioclase + quartz + ilmenite + magnetite occurring as inclusions within garnet and pyroxene grains, peak assemblage (M2) of orthopyroxene + clinopyroxene + plagioclase + garnet + hornblende + quartz + ilmenite + magnetite, and post-peak assemblage (M3) represented by garnet + quartz and garnet + ilmenite/magnetite symplectites. Pseudosection modeling using THERMOCALC in the NCFMASHTO model system for a representative sample constrains the P-T conditions of M1, M2 and M3 stages at 660-730 °C/<6.6 kbar, 800-820 °C/8.0-8.5 kbar and 686-710 °C/7.6-8.6 kbar, respectively. The results of petrology and quantitative P-T pseudosection modeling define an anticlockwise P-T path involving near-isobaric cooling following the peak medium-pressure granulite-facies metamorphism, suggesting that the metamorphism of the Yishui Group was most likely related to the intrusion and underplating of mantle-derived magmas. Although the underplating of voluminous mantle-derived magmas leading to granulite-facies metamorphism with an anticlockwise P-T path involving isobaric cooling may occur in continental magmatic arc regions, above hot spots driven by mantle plumes, or in continental rift environments, a mantle plume model is favored because this model can reasonably interpret many other geological features of Late Archean basement rocks from the Western Shandong Complex in the Eastern Block of the North China Craton as well as their anticlockwise P-T paths involving isobaric cooling. The relatively cooler mantle-plume head heated the crust initially, causing amphibolite-facies metamorphism (M1). Subsequently, the relatively hotter mantle-plume tail heated the crust, causing granulite-facies metamorphism (M2). Finally, a near-isobaric cooling process (M3) occurred when the mantle plume ceased to heat the crust. © 2011 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_US
dc.relation.ispartofPrecambrian Researchen_US
dc.subjectLate Archeanen_US
dc.subjectMafic Granuliteen_US
dc.subjectMetamorphismen_US
dc.subjectNorth China Cratonen_US
dc.subjectP-T Pathen_US
dc.titlePetrology and P-T path of the Yishui mafic granulites: Implications for tectonothermal evolution of the Western Shandong Complex in the Eastern Block of the North China Cratonen_US
dc.typeArticleen_US
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_US
dc.identifier.emailSun, M:minsun@hku.hken_US
dc.identifier.authorityZhao, G=rp00842en_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.precamres.2011.08.008en_US
dc.identifier.scopuseid_2-s2.0-84857627684en_US
dc.identifier.hkuros219472-
dc.identifier.isiWOS:000313765700016-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridWu, M=52664471800en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridYin, C=16053843700en_US
dc.identifier.scopusauthoridLi, S=35248444400en_US
dc.identifier.scopusauthoridTam, PY=49964607300en_US
dc.identifier.citeulike9776139-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats