Article: The ∼390 Ma high-T metamorphic event in the Chinese Altai: A consequence of ridge-subduction?
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| Title | The ∼390 Ma high-T metamorphic event in the Chinese Altai: A consequence of ridge-subduction? | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Authors | Jiang, Y1 Sun, M1 Zhao, G1 Yuan, C1 Xiao, W1 Xia, X1 Long, X1 Wu, F1 | ||||||||||||
| Keywords | Chinese Altai Devonian High-T metamorphism Ridge-subduction | ||||||||||||
| Issue Date | 2010 | ||||||||||||
| Publisher | American 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. 1421-1452 [How to Cite?] DOI: http://dx.doi.org/10.2475/10.2010.08 | ||||||||||||
| Abstract | High-grade rocks occur in the Chinese Altai, but the timing of metamorphism is poorly constrained, which hinders our understanding of the thermo-tectonic history of the region. Representative high-grade samples from the sillimanite zone extending from Hanas to Fuyun were selected for zircon U-Pb dating and temperature estimation. LA-ICP-MS analyses of zircon overgrowth rims and recrystallized domains give consistent ages of ∼390 Ma, which is interpreted to record a regional metamorphic event. Temperature (T) estimations using the amphibole-plagioclase-quartz (Amp-Pl-Qtz) and garnet-biotite (GB) geothermometers give relatively high temperatures ranging from 650 to 700 °C. The zircon metamorphic rims yield temperature estimates of ∼720 °C by using the Ti-in-zircon thermometer. These data suggest that a hightemperature metamorphic event took place in the Chinese Altai in the Middle Devonian, and may imply a tectonic environment involving an unusually elevated heat flux from a deep-seated source. Our data support possible ridge subduction around 390 Ma that caused upwelling of the hot asthenosphere and triggered the high-T metamorphism. This model can also account for coeval volcanic activity with a range of geochemical characteristics, diverse mafic intrusions and extensive hydrothermal mineralization in the Altai orogen. | ||||||||||||
| ISSN | 0002-9599 2011 Impact Factor: 2.716 2011 SCImago Journal Rankings: 0.107 | ||||||||||||
| DOI | http://dx.doi.org/10.2475/10.2010.08 | ||||||||||||
| ISI Accession Number ID | WOS:000290550800009
Funding Information: This study was supported by research grants from the National Basic Research Program of China (2007CB411308), Hong Kong Research Grants Council (HKU7043/07P), HKU research grants, Hong Kong-Germany Joint Research Scheme, and CAS/SAFEA International Partnership Program for Creative Research Teams. Xie Liewen and Yang Yueheng are thanked for laboratory assistance. We wish to also thank Kenny Wong, Geng Hongyan and Cai Keda for their great help during our field investigation. This study was inspired by Professor Alfred Kroner, and the authors are grateful for his continuous scientific encouragement and guidance. Dick Glen, Lifei Zhang and Simon Wilde (guest editor) are thanked for their comments and suggestions which significantly improved the manuscript. | ||||||||||||
| References | References in Scopus |
| dc.contributor.author | Jiang, Y | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| dc.contributor.author | Sun, M | ||||||||||||
| dc.contributor.author | Zhao, G | ||||||||||||
| dc.contributor.author | Yuan, C | ||||||||||||
| dc.contributor.author | Xiao, W | ||||||||||||
| dc.contributor.author | Xia, X | ||||||||||||
| dc.contributor.author | Long, X | ||||||||||||
| dc.contributor.author | Wu, F | ||||||||||||
| dc.date.accessioned | 2011-09-23T05:46:28Z | ||||||||||||
| dc.date.available | 2011-09-23T05:46:28Z | ||||||||||||
| dc.date.issued | 2010 | ||||||||||||
| dc.description.abstract | High-grade rocks occur in the Chinese Altai, but the timing of metamorphism is poorly constrained, which hinders our understanding of the thermo-tectonic history of the region. Representative high-grade samples from the sillimanite zone extending from Hanas to Fuyun were selected for zircon U-Pb dating and temperature estimation. LA-ICP-MS analyses of zircon overgrowth rims and recrystallized domains give consistent ages of ∼390 Ma, which is interpreted to record a regional metamorphic event. Temperature (T) estimations using the amphibole-plagioclase-quartz (Amp-Pl-Qtz) and garnet-biotite (GB) geothermometers give relatively high temperatures ranging from 650 to 700 °C. The zircon metamorphic rims yield temperature estimates of ∼720 °C by using the Ti-in-zircon thermometer. These data suggest that a hightemperature metamorphic event took place in the Chinese Altai in the Middle Devonian, and may imply a tectonic environment involving an unusually elevated heat flux from a deep-seated source. Our data support possible ridge subduction around 390 Ma that caused upwelling of the hot asthenosphere and triggered the high-T metamorphism. This model can also account for coeval volcanic activity with a range of geochemical characteristics, diverse mafic intrusions and extensive hydrothermal mineralization in the Altai orogen. | ||||||||||||
| dc.description.nature | Link_to_subscribed_fulltext | ||||||||||||
| dc.identifier.citation | American Journal Of Science, 2010, v. 310 n. 10, p. 1421-1452 [How to Cite?] DOI: http://dx.doi.org/10.2475/10.2010.08 | ||||||||||||
| dc.identifier.doi | http://dx.doi.org/10.2475/10.2010.08 | ||||||||||||
| dc.identifier.epage | 1452 | ||||||||||||
| dc.identifier.hkuros | 193916 | ||||||||||||
| dc.identifier.isi | WOS:000290550800009
Funding Information: This study was supported by research grants from the National Basic Research Program of China (2007CB411308), Hong Kong Research Grants Council (HKU7043/07P), HKU research grants, Hong Kong-Germany Joint Research Scheme, and CAS/SAFEA International Partnership Program for Creative Research Teams. Xie Liewen and Yang Yueheng are thanked for laboratory assistance. We wish to also thank Kenny Wong, Geng Hongyan and Cai Keda for their great help during our field investigation. This study was inspired by Professor Alfred Kroner, and the authors are grateful for his continuous scientific encouragement and guidance. Dick Glen, Lifei Zhang and Simon Wilde (guest editor) are thanked for their comments and suggestions which significantly improved the manuscript. | ||||||||||||
| dc.identifier.issn | 0002-9599 2011 Impact Factor: 2.716 2011 SCImago Journal Rankings: 0.107 | ||||||||||||
| dc.identifier.issue | 10 | ||||||||||||
| dc.identifier.openurl | | ||||||||||||
| dc.identifier.scopus | eid_2-s2.0-79957447852 | ||||||||||||
| dc.identifier.spage | 1421 | ||||||||||||
| dc.identifier.uri | http://hdl.handle.net/10722/139187 | ||||||||||||
| dc.identifier.volume | 310 | ||||||||||||
| dc.language | eng | ||||||||||||
| dc.publisher | American Journal of Science. The Journal's web site is located at http://www.ajsonline.org | ||||||||||||
| dc.publisher.place | United States | ||||||||||||
| dc.relation.ispartof | American Journal of Science | ||||||||||||
| dc.relation.references | References in Scopus | ||||||||||||
| dc.subject | Chinese Altai | ||||||||||||
| dc.subject | Devonian | ||||||||||||
| dc.subject | High-T metamorphism | ||||||||||||
| dc.subject | Ridge-subduction | ||||||||||||
| dc.title | The ∼390 Ma high-T metamorphic event in the Chinese Altai: A consequence of ridge-subduction? | ||||||||||||
| dc.type | Article |
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