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Article: Structural and geochronological constraints on the tectonic evolution of the Dulong-Song Chay tectonic dome in Yunnan province, SW China
Title | Structural and geochronological constraints on the tectonic evolution of the Dulong-Song Chay tectonic dome in Yunnan province, SW China |
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Authors | |
Keywords | 39Ar/40Ar dating Dulong-Song Chay tectonic dome Indochina Block SHRIMP zircon U-Pb dating South China Block |
Issue Date | 2006 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes |
Citation | Journal Of Asian Earth Sciences, 2006, v. 28 n. 4-6, p. 332-353 How to Cite? |
Abstract | The Dulong-Song Chay tectonic dome lies on the border of China (SE Yunnan Province) and northern Vietnam, and consists of two tectonic and lithologic units: a core complex and a cover sequence, separated by an extensional detachment fault. These two units are overlain unconformably by Late Triassic strata. The core complex is composed of gneiss, schist and amphibolite. SHRIMP zircon U-Pb dating results for the orthogneiss yield an age of 799±10 Ma, which is considered to be the crystallization age of its igneous protolith formed in an arc-related environment. A granitic intrusion within the core complex occurred with an age of 436-402 Ma, which probably formed during partial closure of Paleotethys. Within the core complex, metamorphic grades change sharply from upper greenschist-low amphibolite facies in the core to low greenschist facies in the cover sequence. There are two arrays of foliation within the core complex, detachment fault and the cover sequence: S1 and S2. The pervasive S1 is the axial plane of intrafolial S0 folds. D1 deformation related to this foliation is characterized by extensional structures. The strata were structurally thinned or selectively removed along the detachment faults, indicating exhumation of the Dulong-Song Chay tectonic dome. The major extension occurred at 237 Ma, determined by SHRIMP zircon U-Pb and 39Ar/40Ar isotopic dating techniques. Regionally, simultaneous tectonic extension was associated with pre-Indosinian collision between the South China and Indochina Blocks. The S2 foliation appears as the axial plane of NW-striking S1 buckling folds formed during a compressional regime of D2. D2 is associated with collision between the South China and Indochina Blocks along the Jinshajiang-Ailao Shan suture zone, and represents the Indosinian deformation. The Dulong granites intruded the Dulong-Song Chay dome at 144±2, 140±2 and 116±10 Ma based on 39Ar/40Ar measurement on muscovite and biotite. The dome was later overprinted by a conjugate strike-slip fault and related thrust fault, which formed a vortex structure, contemporaneously with late Cenozoic sinistral movement on the Ailao Shan-Red River fault. © 2005 Elsevier Ltd. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/72775 |
ISSN | 2021 Impact Factor: 3.374 2020 SCImago Journal Rankings: 1.317 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Yan, DP | en_HK |
dc.contributor.author | Zhou, MF | en_HK |
dc.contributor.author | Wang, CY | en_HK |
dc.contributor.author | Xia, B | en_HK |
dc.date.accessioned | 2010-09-06T06:44:59Z | - |
dc.date.available | 2010-09-06T06:44:59Z | - |
dc.date.issued | 2006 | en_HK |
dc.identifier.citation | Journal Of Asian Earth Sciences, 2006, v. 28 n. 4-6, p. 332-353 | en_HK |
dc.identifier.issn | 1367-9120 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/72775 | - |
dc.description.abstract | The Dulong-Song Chay tectonic dome lies on the border of China (SE Yunnan Province) and northern Vietnam, and consists of two tectonic and lithologic units: a core complex and a cover sequence, separated by an extensional detachment fault. These two units are overlain unconformably by Late Triassic strata. The core complex is composed of gneiss, schist and amphibolite. SHRIMP zircon U-Pb dating results for the orthogneiss yield an age of 799±10 Ma, which is considered to be the crystallization age of its igneous protolith formed in an arc-related environment. A granitic intrusion within the core complex occurred with an age of 436-402 Ma, which probably formed during partial closure of Paleotethys. Within the core complex, metamorphic grades change sharply from upper greenschist-low amphibolite facies in the core to low greenschist facies in the cover sequence. There are two arrays of foliation within the core complex, detachment fault and the cover sequence: S1 and S2. The pervasive S1 is the axial plane of intrafolial S0 folds. D1 deformation related to this foliation is characterized by extensional structures. The strata were structurally thinned or selectively removed along the detachment faults, indicating exhumation of the Dulong-Song Chay tectonic dome. The major extension occurred at 237 Ma, determined by SHRIMP zircon U-Pb and 39Ar/40Ar isotopic dating techniques. Regionally, simultaneous tectonic extension was associated with pre-Indosinian collision between the South China and Indochina Blocks. The S2 foliation appears as the axial plane of NW-striking S1 buckling folds formed during a compressional regime of D2. D2 is associated with collision between the South China and Indochina Blocks along the Jinshajiang-Ailao Shan suture zone, and represents the Indosinian deformation. The Dulong granites intruded the Dulong-Song Chay dome at 144±2, 140±2 and 116±10 Ma based on 39Ar/40Ar measurement on muscovite and biotite. The dome was later overprinted by a conjugate strike-slip fault and related thrust fault, which formed a vortex structure, contemporaneously with late Cenozoic sinistral movement on the Ailao Shan-Red River fault. © 2005 Elsevier Ltd. All rights reserved. | en_HK |
dc.language | eng | en_HK |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes | en_HK |
dc.relation.ispartof | Journal of Asian Earth Sciences | en_HK |
dc.subject | 39Ar/40Ar dating | en_HK |
dc.subject | Dulong-Song Chay tectonic dome | en_HK |
dc.subject | Indochina Block | en_HK |
dc.subject | SHRIMP zircon U-Pb dating | en_HK |
dc.subject | South China Block | en_HK |
dc.title | Structural and geochronological constraints on the tectonic evolution of the Dulong-Song Chay tectonic dome in Yunnan province, SW China | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-9120&volume=28&issue=4-6&spage=332&epage=353&date=2006&atitle=Structural+and+geochronological+constraints+on+the+tectonic+evolution+of+the+Dulong-Song+Chay+tectonic+dome+in+Yunnan+province,+SW+China | en_HK |
dc.identifier.email | Zhou, MF:mfzhou@hkucc.hku.hk | en_HK |
dc.identifier.authority | Zhou, MF=rp00844 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.jseaes.2005.10.011 | en_HK |
dc.identifier.scopus | eid_2-s2.0-33747107529 | en_HK |
dc.identifier.hkuros | 167294 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-33747107529&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 28 | en_HK |
dc.identifier.issue | 4-6 | en_HK |
dc.identifier.spage | 332 | en_HK |
dc.identifier.epage | 353 | en_HK |
dc.identifier.isi | WOS:000243247600010 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Yan, DP=36683417500 | en_HK |
dc.identifier.scopusauthorid | Zhou, MF=7403506005 | en_HK |
dc.identifier.scopusauthorid | Wang, CY=34976092700 | en_HK |
dc.identifier.scopusauthorid | Xia, B=36112247900 | en_HK |
dc.identifier.issnl | 1367-9120 | - |