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Article: Post-collisional plutons in the Balikun area, East Chinese Tianshan: Evolving magmatism in response to extension and slab break-off

TitlePost-collisional plutons in the Balikun area, East Chinese Tianshan: Evolving magmatism in response to extension and slab break-off
Authors
KeywordsA-type granites
Central Asian Orogenic Belt
Eastern Tianshan
Plume
Ridge subduction
Slab break-off
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2010, v. 119 n. 3-4, p. 269-288 How to Cite?
AbstractThe Late Carboniferous to Permian is a critical period for final amalgamation of the Central Asian Orogenic Belt (CAOB). Gabbroic and granitic intrusions formed in this period at Balikun, eastern Tianshan, and therefore provide important clues for understanding the tectonic events that took place at this time. The Shiquanzi gabbro was formed at 301±6Ma and consists of low-Si (LS) (SiO 2<47wt.%) and high-Si (HS) (SiO 2>48wt.%) members, and both are characterized by high Nb (>9ppm), high εNd (t) (+7.12-+8.71) and low initial 87Sr/ 86Sr ratios (0.7030-0.7041). The HS gabbros have HFSE (Nb=17.5-24.2ppm) contents, and Nb/Y (0.56-0.72) and Ta/Yb (0.52-0.60) ratios, higher than those of the LS samples and exhibit E-MORB-like characteristics, while the LS samples have higher Ba/Th ratios (150-236) and more prominent subduction-related signatures than those of the HS samples (Ba/Th=10-91). The HS rocks probably resulted from decompressional melting of asthenospheric mantle, whereas the LS rocks originated from a depleted mantle source metasomatised by slab-derived fluid. The Shiquanzi gabbro therefore reflects an extensional environment, in which asthenospheric mantle upwelled and triggered partial melting of metasomatised depleted mantle at a shallower level. Granitic intrusions at Balikun (Daliugou Pluton, Dajiashan Pluton and Barkol Tagh Batholith) formed in the Early Permian (284-288Ma), and generally have alkali-calcic compositions and exhibit characteristics of A2-type granite. Their variable Nd (εNd (t)=+1.92-+6.03) and Sr ( 87Sr/ 86Sr (i)=0.7040-0.7152) isotope compositions and young T DM model ages (0.56-0.75Ga) suggest that they were derived from juvenile crustal sources, probably earlier arc intrusions. From the Late Carboniferous to Early Permian, magmatism at Balikun evolved from gabbroic bodies to large A2-type granitic intrusions, implying a gradually increasing impact of mantle-derived magma on the crust. A slab break-off regime, following accretion of the Harlik Arc onto the Angara continent, may explain the post-collisional magmatism and geodynamic transition of the eastern Tianshan. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139197
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
NSFC40721063
40772130
Hong Kong RGCHKU 7040/04
CAS/SAFEA
Funding Information:

We thank Mrs. Liu Ying and Mrs. Chen Linli and Mr. Li Chaofeng for their kind help with analyses. CY benefited much from discussions with Professors A. Kroner, Zheng-Xiang Li and Chunming Wu. We are indebted to Robert Kerrich and an anonymous reviewer, whose insightful and constructive reviews have greatly improved the paper. We thank Nelson Eby for his kind and careful editorial help, and Bernard Bonin and Mehmet Keskin for their critical and constructive comments on an early version of the manuscript. This work was supported by research grants from the National Basic Research Program of China (Program 973) 2007CB411308, NSFC projects 40721063, 40772130, Hong Kong RGC (HKU 7040/04) and the CAS/SAFEA International Partnership Program for Creative Research Teams. This is contribution no. IS-1210 from GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorWilde, Sen_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorXu, Yen_HK
dc.contributor.authorLong, Xen_HK
dc.contributor.authorZhao, Gen_HK
dc.date.accessioned2011-09-23T05:46:32Z-
dc.date.available2011-09-23T05:46:32Z-
dc.date.issued2010en_HK
dc.identifier.citationLithos, 2010, v. 119 n. 3-4, p. 269-288en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139197-
dc.description.abstractThe Late Carboniferous to Permian is a critical period for final amalgamation of the Central Asian Orogenic Belt (CAOB). Gabbroic and granitic intrusions formed in this period at Balikun, eastern Tianshan, and therefore provide important clues for understanding the tectonic events that took place at this time. The Shiquanzi gabbro was formed at 301±6Ma and consists of low-Si (LS) (SiO 2<47wt.%) and high-Si (HS) (SiO 2>48wt.%) members, and both are characterized by high Nb (>9ppm), high εNd (t) (+7.12-+8.71) and low initial 87Sr/ 86Sr ratios (0.7030-0.7041). The HS gabbros have HFSE (Nb=17.5-24.2ppm) contents, and Nb/Y (0.56-0.72) and Ta/Yb (0.52-0.60) ratios, higher than those of the LS samples and exhibit E-MORB-like characteristics, while the LS samples have higher Ba/Th ratios (150-236) and more prominent subduction-related signatures than those of the HS samples (Ba/Th=10-91). The HS rocks probably resulted from decompressional melting of asthenospheric mantle, whereas the LS rocks originated from a depleted mantle source metasomatised by slab-derived fluid. The Shiquanzi gabbro therefore reflects an extensional environment, in which asthenospheric mantle upwelled and triggered partial melting of metasomatised depleted mantle at a shallower level. Granitic intrusions at Balikun (Daliugou Pluton, Dajiashan Pluton and Barkol Tagh Batholith) formed in the Early Permian (284-288Ma), and generally have alkali-calcic compositions and exhibit characteristics of A2-type granite. Their variable Nd (εNd (t)=+1.92-+6.03) and Sr ( 87Sr/ 86Sr (i)=0.7040-0.7152) isotope compositions and young T DM model ages (0.56-0.75Ga) suggest that they were derived from juvenile crustal sources, probably earlier arc intrusions. From the Late Carboniferous to Early Permian, magmatism at Balikun evolved from gabbroic bodies to large A2-type granitic intrusions, implying a gradually increasing impact of mantle-derived magma on the crust. A slab break-off regime, following accretion of the Harlik Arc onto the Angara continent, may explain the post-collisional magmatism and geodynamic transition of the eastern Tianshan. © 2010 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.subjectA-type granitesen_HK
dc.subjectCentral Asian Orogenic Belten_HK
dc.subjectEastern Tianshanen_HK
dc.subjectPlumeen_HK
dc.subjectRidge subductionen_HK
dc.subjectSlab break-offen_HK
dc.titlePost-collisional plutons in the Balikun area, East Chinese Tianshan: Evolving magmatism in response to extension and slab break-offen_HK
dc.typeArticleen_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2010.07.004en_HK
dc.identifier.scopuseid_2-s2.0-77956893367en_HK
dc.identifier.hkuros193930en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77956893367&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume119en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage269en_HK
dc.identifier.epage288en_HK
dc.identifier.isiWOS:000283462000007-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridWilde, S=35254758600en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridXu, Y=35333344300en_HK
dc.identifier.scopusauthoridLong, X=14012199100en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.citeulike7581919-

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