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Article: Metamorphism of the Lüliang amphibolite: Implications for the tectonic evolution of the North China Craton

TitleMetamorphism of the Lüliang amphibolite: Implications for the tectonic evolution of the North China Craton
Authors
KeywordsAmphibolite
Continent-continent collision
Metamorphism
North China Craton
Paleoproterozoic
Trans-North China Orogen
Issue Date2010
PublisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.org
Citation
American Journal Of Science, 2010, v. 310 n. 10, p. 1480-1502 How to Cite?
AbstractThe Lüliang Complex is located in the southern sector of the Trans-North China Orogen, a continent-continent collisional belt along which the discrete Archean Eastern and Western blocks amalgamated to form the basement of the North China Craton. The complex consists of Paleoproterozoic supracrustal rocks and granitoid plutons of which the former include amphibolites and pelitic schists/gneisses. Petrological evidence from the Lüliang amphibolites indicates three distinct metamorphic mineral assemblages. The early inclusion assemblage (M1) is composed of hornblende + plagioclase + quartz + ilmenite, preserved as mineral inclusions within garnet porphyroblasts. The THERMOCALC program yielded maximum P-T conditions of 7.1 to 6.1 kbar and 668 to 655 °C for the M1 assemblage, based on the core compositions of garnet porphyroblasts and inclusion-type hornblende and plagioclase. The peak porphyroblast-matrix assemblage (M2) is garnet + hornblende + plagioclase + clinopyroxene ± quartz ± rutile, representing the growth of garnet porphyroblasts and matrix minerals. The P-T conditions of the M2 assemblage were estimated at 9.2 to 8.3 kbar and 753 to 748 °C, based on the rim compositions of garnet porphyroblasts and matrix plagioclase, hornblende and clinopyroxene. The post-peak symplectite assemblage (M3) is represented by cummingtonite + plagioclase symplectite surrounding embayed garnet grains, with the maximum P-T conditions of 5.1 to 4.1 kbar and 737 to 697 °C, based on the rim compositions of garnet and symplectic cummingtonite and plagioclase. A combination of petrographic textures, reaction relations, mineral compositions and P-T data define a clockwise P-T path involving near-isothermal decompression for the Lüliang amphibolites. This suggests that like those metamorphic complexes in the northern part of the Trans-North China Orogen, the Lüliang Complex in the central part of the orogen also underwent initial crustal thickening (M 1 and M2), followed by erosional and/or extensional exhumation (M3), which is in accordance with collision between the Eastern and Western Blocks to form the coherent basement of the North China Craton at ∼1.85 Ga.
Persistent Identifierhttp://hdl.handle.net/10722/139190
ISSN
2015 Impact Factor: 3.566
2015 SCImago Journal Rankings: 2.104
ISI Accession Number ID
Funding AgencyGrant Number
Chinese National 973 Program2007CB411307
Chinese NSFC40730315
40872123
40872122
Hong Kong RGC7066/07P
7063/06P
7053/08P
HKU
Funding Information:

This paper honors the distinguished geologist Alfred Kroner, on the occasion of his 70th birthday, for his contributions to Precambrian geology and geochronology. This research was funded by the Chinese National 973 Program (2007CB411307), Chinese NSFC Grants (40730315, 40872123 and 40872122) and Hong Kong RGC grants (7066/07P, 7063/06P and 7053/08P) and HKU Seed Fund for Basic Research. We thank journal reviewers Alicia Lopez-Carmona, Santanu Kumar Bhowmik and Yuejun Wang for their constructive comments on this paper.

References

 

DC FieldValueLanguage
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorYin, Cen_HK
dc.contributor.authorGuo, Jen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLi, Sen_HK
dc.contributor.authorLi, Xen_HK
dc.contributor.authorWu, Cen_HK
dc.contributor.authorLiu, Cen_HK
dc.date.accessioned2011-09-23T05:46:29Z-
dc.date.available2011-09-23T05:46:29Z-
dc.date.issued2010en_HK
dc.identifier.citationAmerican Journal Of Science, 2010, v. 310 n. 10, p. 1480-1502en_HK
dc.identifier.issn0002-9599en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139190-
dc.description.abstractThe Lüliang Complex is located in the southern sector of the Trans-North China Orogen, a continent-continent collisional belt along which the discrete Archean Eastern and Western blocks amalgamated to form the basement of the North China Craton. The complex consists of Paleoproterozoic supracrustal rocks and granitoid plutons of which the former include amphibolites and pelitic schists/gneisses. Petrological evidence from the Lüliang amphibolites indicates three distinct metamorphic mineral assemblages. The early inclusion assemblage (M1) is composed of hornblende + plagioclase + quartz + ilmenite, preserved as mineral inclusions within garnet porphyroblasts. The THERMOCALC program yielded maximum P-T conditions of 7.1 to 6.1 kbar and 668 to 655 °C for the M1 assemblage, based on the core compositions of garnet porphyroblasts and inclusion-type hornblende and plagioclase. The peak porphyroblast-matrix assemblage (M2) is garnet + hornblende + plagioclase + clinopyroxene ± quartz ± rutile, representing the growth of garnet porphyroblasts and matrix minerals. The P-T conditions of the M2 assemblage were estimated at 9.2 to 8.3 kbar and 753 to 748 °C, based on the rim compositions of garnet porphyroblasts and matrix plagioclase, hornblende and clinopyroxene. The post-peak symplectite assemblage (M3) is represented by cummingtonite + plagioclase symplectite surrounding embayed garnet grains, with the maximum P-T conditions of 5.1 to 4.1 kbar and 737 to 697 °C, based on the rim compositions of garnet and symplectic cummingtonite and plagioclase. A combination of petrographic textures, reaction relations, mineral compositions and P-T data define a clockwise P-T path involving near-isothermal decompression for the Lüliang amphibolites. This suggests that like those metamorphic complexes in the northern part of the Trans-North China Orogen, the Lüliang Complex in the central part of the orogen also underwent initial crustal thickening (M 1 and M2), followed by erosional and/or extensional exhumation (M3), which is in accordance with collision between the Eastern and Western Blocks to form the coherent basement of the North China Craton at ∼1.85 Ga.en_HK
dc.languageengen_US
dc.publisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.orgen_HK
dc.relation.ispartofAmerican Journal of Scienceen_HK
dc.subjectAmphiboliteen_HK
dc.subjectContinent-continent collisionen_HK
dc.subjectMetamorphismen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPaleoproterozoicen_HK
dc.subjectTrans-North China Orogenen_HK
dc.titleMetamorphism of the Lüliang amphibolite: Implications for the tectonic evolution of the North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2475/10.2010.10en_HK
dc.identifier.scopuseid_2-s2.0-79957487698en_HK
dc.identifier.hkuros193922en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79957487698&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume310en_HK
dc.identifier.issue10en_HK
dc.identifier.spage1480en_HK
dc.identifier.epage1502en_HK
dc.identifier.isiWOS:000290550800011-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridYin, C=16053843700en_HK
dc.identifier.scopusauthoridGuo, J=35368525900en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridLi, S=35248444400en_HK
dc.identifier.scopusauthoridLi, X=35254067700en_HK
dc.identifier.scopusauthoridWu, C=7501664637en_HK
dc.identifier.scopusauthoridLiu, C=36955394800en_HK

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