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Article: Petrology and P-T history of the Wutai amphibolites: Implications for tectonic evolution of the Wutai Complex, China

TitlePetrology and P-T history of the Wutai amphibolites: Implications for tectonic evolution of the Wutai Complex, China
Authors
KeywordsAmphibolite Facies
Continental Collision
Decompression Reactions
Deformatio
Greenschist Facies
Metamorphism
Issue Date1999
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 1999, v. 93 n. 2-3, p. 181-199 How to Cite?
AbstractThe Wutai Complex represents the best preserved granite-greenstone terrane in the North China Craton. The complex comprises a sequence of metamorphosed ultramafic to felsic volcanic rocks, variably deformed granitoid rocks, along with lesser amounts of siliciclastic and carbonate rocks and banded iron formations. petrological evidence from the Wutai amphibolites indicates four metamorphic evolutionary stages. The M1 assemblage is composed of plagioclase+quartz+actinolite+chlorite+epidote+biotite+rutile, preserved as mineral inclusions in garnet porphyroblasts. The metamorphic conditions for this assemblage cannot be quantitatively estimated. The M2 stage is represented by garnet porphyroblasts in a matrix of quartz, plagioclase, amphibole, biotite, rutile and ilmenite. P-T conditions for this assemblage have been estimated using the program TWEEQU at 10-12 kbar and 600-650°C. The M3 assemblage is shown by amphibole+plagioclase±ilmenite symplectic coronas around embayed garnets and yeilds P-T conditions of 6.0-7.0 kbar and 600-650°C. M4 is represented by chlorite and epidote rimming garnet, chlorite rimming amphibole and epidote replacing plagioclase under greenschist-facies conditions of 400-500°C and relatively lower pressures. Taken together, the qualitative P-T estimates from M1 and M4 and the quantitative P-T estimates from M2 and M3 define a clockwise P-T path for the Wutai amphibolites. The estimated P-T path from the four stages suggests that the Wutai Complex underwent initial burial and crustal thickening (M1 + M2), subsequent isothermal exhumation (M3), and finally cooling and retrogression (M4). This tectonothermal path, along with those of the Fuping and Hengshan complexes, which bound the southeast and northwest margins, respectively, of the Wutai Complex, is considered to record the early Paleoproterozoic collision between the eastern and western segments of the North China craton.
Persistent Identifierhttp://hdl.handle.net/10722/151027
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhao, Gen_US
dc.contributor.authorCawood, Pen_US
dc.contributor.authorLu, Len_US
dc.date.accessioned2012-06-26T06:16:07Z-
dc.date.available2012-06-26T06:16:07Z-
dc.date.issued1999en_US
dc.identifier.citationPrecambrian Research, 1999, v. 93 n. 2-3, p. 181-199en_US
dc.identifier.issn0301-9268en_US
dc.identifier.urihttp://hdl.handle.net/10722/151027-
dc.description.abstractThe Wutai Complex represents the best preserved granite-greenstone terrane in the North China Craton. The complex comprises a sequence of metamorphosed ultramafic to felsic volcanic rocks, variably deformed granitoid rocks, along with lesser amounts of siliciclastic and carbonate rocks and banded iron formations. petrological evidence from the Wutai amphibolites indicates four metamorphic evolutionary stages. The M1 assemblage is composed of plagioclase+quartz+actinolite+chlorite+epidote+biotite+rutile, preserved as mineral inclusions in garnet porphyroblasts. The metamorphic conditions for this assemblage cannot be quantitatively estimated. The M2 stage is represented by garnet porphyroblasts in a matrix of quartz, plagioclase, amphibole, biotite, rutile and ilmenite. P-T conditions for this assemblage have been estimated using the program TWEEQU at 10-12 kbar and 600-650°C. The M3 assemblage is shown by amphibole+plagioclase±ilmenite symplectic coronas around embayed garnets and yeilds P-T conditions of 6.0-7.0 kbar and 600-650°C. M4 is represented by chlorite and epidote rimming garnet, chlorite rimming amphibole and epidote replacing plagioclase under greenschist-facies conditions of 400-500°C and relatively lower pressures. Taken together, the qualitative P-T estimates from M1 and M4 and the quantitative P-T estimates from M2 and M3 define a clockwise P-T path for the Wutai amphibolites. The estimated P-T path from the four stages suggests that the Wutai Complex underwent initial burial and crustal thickening (M1 + M2), subsequent isothermal exhumation (M3), and finally cooling and retrogression (M4). This tectonothermal path, along with those of the Fuping and Hengshan complexes, which bound the southeast and northwest margins, respectively, of the Wutai Complex, is considered to record the early Paleoproterozoic collision between the eastern and western segments of the North China craton.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.subjectAmphibolite Faciesen_US
dc.subjectContinental Collisionen_US
dc.subjectDecompression Reactionsen_US
dc.subjectDeformatioen_US
dc.subjectGreenschist Faciesen_US
dc.subjectMetamorphismen_US
dc.titlePetrology and P-T history of the Wutai amphibolites: Implications for tectonic evolution of the Wutai Complex, Chinaen_US
dc.typeArticleen_US
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_US
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0301-9268(98)00090-4en_US
dc.identifier.scopuseid_2-s2.0-0033620116en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033620116&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume93en_US
dc.identifier.issue2-3en_US
dc.identifier.spage181en_US
dc.identifier.epage199en_US
dc.identifier.isiWOS:000078124800003-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridCawood, P=7004146041en_US
dc.identifier.scopusauthoridLu, L=7403963741en_US

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