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Conference Paper: Tectonic evolution of the Mesozoic Songpan-Ganze orogenic belt in the eastern margin of Tibetan plateau: Constraints from structural analyses and 40Ar-39Ar dating

TitleTectonic evolution of the Mesozoic Songpan-Ganze orogenic belt in the eastern margin of Tibetan plateau: Constraints from structural analyses and 40Ar-39Ar dating
Authors
Issue Date2006
PublisherElsevier B.V.
Citation
16th Annual V M Goldschmidt Conference, Melbourne, Australia, August 27-September 1, 2006. In Geochimica et Cosmochimica Acta, v. 70, p. A719-A719 How to Cite?
AbstractThe Songpan-Ganze Orogenic belt (SGOB) in the Tibetan plateau was a consequence of the collision between the South China block and the North China block during Triassic time [1-3]. The Jianglang, Danba and Xuelongbao tectonic domes form an extensional belt along the eastern part of the SGOB and are composed of three units: core, middle ductilely slab and cover. Supracrustal paragneisses, mica-schist, and quartzite comprise cores of these domes and contain multi-stages of foliation and metamorphic mineral assemblages, whereas the Paleozoic to Triassic cover sequences have thicknesses ranging from 30 to 40 km with only a contractional foliation. The ductilely middle slabs, seperating the core from the cover, are composed of mylonite with S-C fabric, intralayer fold and metamorphic mineral assemblage of garnet -biotite -muscovite -quartz -plagioclase of greenschist facies metamorphism. They have variable thicknesses from centimeters to kilometers and show ESE-ward extensional senses. Amphibole separates yield well defined 39Ar-40Ar plateau ages of 176 ± 0.68 Ma for the slab of the Jianglang dome (LS2), 161 ± 0.7 for the slab of the Xuelongbao dome (BM29) and 173 ± 12 Ma, 170 ± 10 Ma and 166 ± 9 Ma (GZ-5), and 159 ± 14 Ma (DB-8) for the slab of the Danba dome, consistent with SHRIMP zircon (metamorphic rims) U-Pb ages of 175 ± 3 and 176 ± 2 Ma [1, 4]. We conclude that the tectonic evolution of the SGOB involved the Triassic compression to Jurassic extension which resulted in the selective removing or thinning of the middle slab at 159-176 Ma.
DescriptionGoldschmidt Conference Abstracts 2006
Persistent Identifierhttp://hdl.handle.net/10722/72668
ISSN
2015 Impact Factor: 4.315
2015 SCImago Journal Rankings: 3.016
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYan, DPen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorDong, TZen_HK
dc.contributor.authorLiu, Hen_HK
dc.date.accessioned2010-09-06T06:43:59Z-
dc.date.available2010-09-06T06:43:59Z-
dc.date.issued2006en_HK
dc.identifier.citation16th Annual V M Goldschmidt Conference, Melbourne, Australia, August 27-September 1, 2006. In Geochimica et Cosmochimica Acta, v. 70, p. A719-A719en_HK
dc.identifier.issn0016-7037-
dc.identifier.urihttp://hdl.handle.net/10722/72668-
dc.descriptionGoldschmidt Conference Abstracts 2006-
dc.description.abstractThe Songpan-Ganze Orogenic belt (SGOB) in the Tibetan plateau was a consequence of the collision between the South China block and the North China block during Triassic time [1-3]. The Jianglang, Danba and Xuelongbao tectonic domes form an extensional belt along the eastern part of the SGOB and are composed of three units: core, middle ductilely slab and cover. Supracrustal paragneisses, mica-schist, and quartzite comprise cores of these domes and contain multi-stages of foliation and metamorphic mineral assemblages, whereas the Paleozoic to Triassic cover sequences have thicknesses ranging from 30 to 40 km with only a contractional foliation. The ductilely middle slabs, seperating the core from the cover, are composed of mylonite with S-C fabric, intralayer fold and metamorphic mineral assemblage of garnet -biotite -muscovite -quartz -plagioclase of greenschist facies metamorphism. They have variable thicknesses from centimeters to kilometers and show ESE-ward extensional senses. Amphibole separates yield well defined 39Ar-40Ar plateau ages of 176 ± 0.68 Ma for the slab of the Jianglang dome (LS2), 161 ± 0.7 for the slab of the Xuelongbao dome (BM29) and 173 ± 12 Ma, 170 ± 10 Ma and 166 ± 9 Ma (GZ-5), and 159 ± 14 Ma (DB-8) for the slab of the Danba dome, consistent with SHRIMP zircon (metamorphic rims) U-Pb ages of 175 ± 3 and 176 ± 2 Ma [1, 4]. We conclude that the tectonic evolution of the SGOB involved the Triassic compression to Jurassic extension which resulted in the selective removing or thinning of the middle slab at 159-176 Ma.-
dc.languageengen_HK
dc.publisherElsevier B.V.-
dc.relation.ispartofGeochimica et Cosmochimica Actaen_HK
dc.titleTectonic evolution of the Mesozoic Songpan-Ganze orogenic belt in the eastern margin of Tibetan plateau: Constraints from structural analyses and 40Ar-39Ar datingen_HK
dc.typeConference_Paperen_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gca.2006.06.1290-
dc.identifier.hkuros167285en_HK
dc.identifier.volume70-
dc.identifier.spageA719-
dc.identifier.epageA719-
dc.identifier.isiWOS:000241374201680-
dc.publisher.placeNew York, NY-

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