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Article: Structural and geochronological constraints on the tectono-thermal evolution of the Danba domal terrane, eastern margin of the Tibetan plateau

TitleStructural and geochronological constraints on the tectono-thermal evolution of the Danba domal terrane, eastern margin of the Tibetan plateau
Authors
KeywordsEastern margin of the Tibetan plateau
Geochronology
Mantle plume
Post-orogenic extension
Structure
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2008, v. 33 n. 5-6, p. 414-427 How to Cite?
AbstractThe Songpan-Ganze terrane of the Tibetan plateau is underlain by Neoproterozoic crystalline basement rocks of the Yangtze block. These basement rocks are exposed as a series of extensional tectonic domes that form a nearly north-south trending extensional belt more than 1000 km long in the eastern margin of the Tibetan plateau. In the Danba area, detachment faults separate the basement core complexes (e.g., the Gezong and Gongcai complexes) from the Paleozoic strata which have been thinned or removed completely. The cover sequences have undergone upper greenschist to lower amphibolite facies metamorphism to form the Danba schist and are overlain by the Triassic Xikang Group, a thick flysch sequence. Both the basement rocks and the Paleozoic rocks have undergone multiple stages of deformation and thus provide an excellent opportunity to study the tectono-thermal evolution of the eastern margin of the Tibetan plateau. Two stages of deformation, corresponding to three generations of foliation (S 1, S 2 1, and S 2 2), have been recognized on the basis of structural and microscopic observations. We selected amphibole and biotite separates associated with distinct generations of foliation for 40Ar/ 39Ar dating using laser microprobe incremental heating technique to place numerical constraints on the major tectono-thermal events within the Danba area. The geochronogical results reveal an earliest metamorphic event at 258.6 ± 0.5 Ma (S 1 biotite) and 263.6 ± 0.8 Ma (S 1 amphibole), coinciding temporally with the mantle plume that produced the voluminous Emeishan flood basalts. The second event was a progressive extensional deformation first occurred at 159-166 Ma (S 2 1 amphibole) responsible for the earlier tectonic doming of the crystalline basement, and then the final tectono-thermal overprint recorded by S 2 2 foliation and M 2 2 metamorphism locally in the core complexes at 47-58 Ma for the Gezong complex and 64-81 Ma for the Gongcai complex. This major post-orogenic extensional event is believed to be a consequence of collision between the North China and South China blocks. The apparent discrepancy of the 40Ar/ 39Ar ages observed between localities suggests a slow cooling process associated with progressive uplift. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72861
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorYan, DPen_HK
dc.contributor.authorVasconcelos, PMen_HK
dc.contributor.authorLi, JWen_HK
dc.contributor.authorHu, RZen_HK
dc.date.accessioned2010-09-06T06:45:48Z-
dc.date.available2010-09-06T06:45:48Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Asian Earth Sciences, 2008, v. 33 n. 5-6, p. 414-427en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72861-
dc.description.abstractThe Songpan-Ganze terrane of the Tibetan plateau is underlain by Neoproterozoic crystalline basement rocks of the Yangtze block. These basement rocks are exposed as a series of extensional tectonic domes that form a nearly north-south trending extensional belt more than 1000 km long in the eastern margin of the Tibetan plateau. In the Danba area, detachment faults separate the basement core complexes (e.g., the Gezong and Gongcai complexes) from the Paleozoic strata which have been thinned or removed completely. The cover sequences have undergone upper greenschist to lower amphibolite facies metamorphism to form the Danba schist and are overlain by the Triassic Xikang Group, a thick flysch sequence. Both the basement rocks and the Paleozoic rocks have undergone multiple stages of deformation and thus provide an excellent opportunity to study the tectono-thermal evolution of the eastern margin of the Tibetan plateau. Two stages of deformation, corresponding to three generations of foliation (S 1, S 2 1, and S 2 2), have been recognized on the basis of structural and microscopic observations. We selected amphibole and biotite separates associated with distinct generations of foliation for 40Ar/ 39Ar dating using laser microprobe incremental heating technique to place numerical constraints on the major tectono-thermal events within the Danba area. The geochronogical results reveal an earliest metamorphic event at 258.6 ± 0.5 Ma (S 1 biotite) and 263.6 ± 0.8 Ma (S 1 amphibole), coinciding temporally with the mantle plume that produced the voluminous Emeishan flood basalts. The second event was a progressive extensional deformation first occurred at 159-166 Ma (S 2 1 amphibole) responsible for the earlier tectonic doming of the crystalline basement, and then the final tectono-thermal overprint recorded by S 2 2 foliation and M 2 2 metamorphism locally in the core complexes at 47-58 Ma for the Gezong complex and 64-81 Ma for the Gongcai complex. This major post-orogenic extensional event is believed to be a consequence of collision between the North China and South China blocks. The apparent discrepancy of the 40Ar/ 39Ar ages observed between localities suggests a slow cooling process associated with progressive uplift. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_HK
dc.relation.ispartofJournal of Asian Earth Sciencesen_HK
dc.subjectEastern margin of the Tibetan plateauen_HK
dc.subjectGeochronologyen_HK
dc.subjectMantle plumeen_HK
dc.subjectPost-orogenic extensionen_HK
dc.subjectStructureen_HK
dc.titleStructural and geochronological constraints on the tectono-thermal evolution of the Danba domal terrane, eastern margin of the Tibetan plateauen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-9120&volume=33&spage=414&epage=427&date=2008&atitle=Structural+and+geochronological+constraints+on+the+tectono-thermal+evolution+of+the+Danba+domal+terrane,+eastern+margin+of+the+Tibetan+Plateauen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jseaes.2008.03.003en_HK
dc.identifier.scopuseid_2-s2.0-49749103956en_HK
dc.identifier.hkuros153190en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-49749103956&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue5-6en_HK
dc.identifier.spage414en_HK
dc.identifier.epage427en_HK
dc.identifier.isiWOS:000259419400010-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridYan, DP=36683417500en_HK
dc.identifier.scopusauthoridVasconcelos, PM=7005771965en_HK
dc.identifier.scopusauthoridLi, JW=36067183300en_HK
dc.identifier.scopusauthoridHu, RZ=7202640800en_HK

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