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Article: The ∼390 Ma high-T metamorphic event in the Chinese Altai: A consequence of ridge-subduction?
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TitleThe ∼390 Ma high-T metamorphic event in the Chinese Altai: A consequence of ridge-subduction?
 
AuthorsJiang, Y1
Sun, M1
Zhao, G1
Yuan, C3
Xiao, W2
Xia, X1
Long, X3
Wu, F2
 
KeywordsChinese Altai
Devonian
High-T metamorphism
Ridge-subduction
 
Issue Date2010
 
PublisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.org
 
CitationAmerican Journal Of Science, 2010, v. 310 n. 10, p. 1421-1452 [How to Cite?]
DOI: http://dx.doi.org/10.2475/10.2010.08
 
AbstractHigh-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.
 
ISSN0002-9599
2013 Impact Factor: 3.929
2013 SCImago Journal Rankings: 2.424
 
DOIhttp://dx.doi.org/10.2475/10.2010.08
 
ISI Accession Number IDWOS:000290550800009
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong Research Grants CouncilHKU7043/07P
HKU
Hong Kong-Germany Joint Research Scheme
CAS/SAFEA
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.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorJiang, Y
 
dc.contributor.authorSun, M
 
dc.contributor.authorZhao, G
 
dc.contributor.authorYuan, C
 
dc.contributor.authorXiao, W
 
dc.contributor.authorXia, X
 
dc.contributor.authorLong, X
 
dc.contributor.authorWu, F
 
dc.date.accessioned2011-09-23T05:46:28Z
 
dc.date.available2011-09-23T05:46:28Z
 
dc.date.issued2010
 
dc.description.abstractHigh-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.naturelink_to_subscribed_fulltext
 
dc.identifier.citationAmerican 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.doihttp://dx.doi.org/10.2475/10.2010.08
 
dc.identifier.epage1452
 
dc.identifier.hkuros193916
 
dc.identifier.isiWOS:000290550800009
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong Research Grants CouncilHKU7043/07P
HKU
Hong Kong-Germany Joint Research Scheme
CAS/SAFEA
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.issn0002-9599
2013 Impact Factor: 3.929
2013 SCImago Journal Rankings: 2.424
 
dc.identifier.issue10
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-79957447852
 
dc.identifier.spage1421
 
dc.identifier.urihttp://hdl.handle.net/10722/139187
 
dc.identifier.volume310
 
dc.languageeng
 
dc.publisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.org
 
dc.publisher.placeUnited States
 
dc.relation.ispartofAmerican Journal of Science
 
dc.relation.referencesReferences in Scopus
 
dc.subjectChinese Altai
 
dc.subjectDevonian
 
dc.subjectHigh-T metamorphism
 
dc.subjectRidge-subduction
 
dc.titleThe ∼390 Ma high-T metamorphic event in the Chinese Altai: A consequence of ridge-subduction?
 
dc.typeArticle
 
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<contributor.author>Yuan, C</contributor.author>
<contributor.author>Xiao, W</contributor.author>
<contributor.author>Xia, X</contributor.author>
<contributor.author>Long, X</contributor.author>
<contributor.author>Wu, F</contributor.author>
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<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 &#8764;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 &#176;C. The zircon metamorphic rims yield temperature estimates of &#8764;720 &#176;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.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong
  2. Institute of Geology and Geophysics Chinese Academy of Sciences
  3. Guangzhou Institute of Geochemistry Chinese Academy of Sciences