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Article: Carboniferous mantle-derived felsic intrusion in the Chinese Altai, NW China: implications for geodynamic change of the accretionary orogenic belt
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TitleCarboniferous mantle-derived felsic intrusion in the Chinese Altai, NW China: implications for geodynamic change of the accretionary orogenic belt
 
AuthorsCai, K1
Sun, M1
Yuan, C3
Xiao, W2
Zhao, G1
Long, X3
Wu, F2
 
KeywordsAccretionary orogenic belt
Caob
Chinese altai
Geochemistry
Geochronology
 
Issue Date2012
 
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
 
CitationGondwana Research, 2012, v. 22 n. 2, p. 681-698 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gr.2011.11.008
 
AbstractThis paper reports whole-rock Sr-Nd and zircon U-Pb and Hf isotopic compositions, as well as major and trace element data, for the granodiorites and their mafic microgranular enclaves (MMEs) in the Tuokesalei area, northwestern Chinese Altai. The granodiorites are characterized by peraluminous compositions (A/CNK=1.01-1.45), with relatively high SiO 2 (64.4 to 70.9wt.%) and low MgO (0.75 to 1.97wt.%) contents. These rocks possess low total rare earth element (REE) contents (67-187ppm) with weakly negative Eu anomalies and mantle-like whole-rock Nd-Sr isotopic compositions (ε Nd(t)=+2.5 to +4.5; ( 87Sr/ 86Sr) i=0.7038 to 0.7048) and zircon ε Hf(t) values (+5.93 to +12.9). The MMEs contain abundant magmatic amphiboles and needle-like apatites, have low SiO 2 (51.7 to 54.3wt.%) and high MgO (2.86 to 3.75wt.%) and REE contents (162-298ppm), and are characterized by moderately negative Eu anomalies (Eu/Eu*=0.40-0.60) and slightly depleted to enriched LREE ((La/Nd) N=0.74-1.41) and flat HREE ((Gd/Yb) N=1.16-1.39) patterns. The MMEs have whole-rock Nd-Sr isotopic compositions (ε Nd(t)=+2.6 to +2.7, ( 87Sr/ 86Sr) i=0.7034-0.7050) similar to those of the host granodiorites. Their similarities in crystallization age, mineral assemblage and isotopic composition document that the MMEs may represent an early crystallized phase, which was broken into pieces and brought to the shallow level during the host magma ascent and emplacement. Their precursor magmas were probably derived from an oceanic lithospheric mantle, which was characterized by pronounced Nd-Ta depletions. Mineral compositions of MMEs suggest that amphibole was a major early fractional mineral, which effectively differentiated the mantle-derived basaltic liquids to silica-rich melts. Zircon U-Pb dating yielded an age of 313±5Ma for the host granodiorites and 313±13Ma for their MMEs. The geochemical data of this study records an important episode of magmatism in an environment transitional from a subduction-related regime to a post-tectonic extension. Results of this study suggest that the accretionary orogenic process did not completely terminate until the Late Carboniferous to Permian in this region. © 2011 International Association for Gondwana Research.
 
ISSN1342-937X
2013 Impact Factor: 8.122
2013 SCImago Journal Rankings: 3.898
 
DOIhttp://dx.doi.org/10.1016/j.gr.2011.11.008
 
DC FieldValue
dc.contributor.authorCai, K
 
dc.contributor.authorSun, M
 
dc.contributor.authorYuan, C
 
dc.contributor.authorXiao, W
 
dc.contributor.authorZhao, G
 
dc.contributor.authorLong, X
 
dc.contributor.authorWu, F
 
dc.date.accessioned2012-06-26T06:20:57Z
 
dc.date.available2012-06-26T06:20:57Z
 
dc.date.issued2012
 
dc.description.abstractThis paper reports whole-rock Sr-Nd and zircon U-Pb and Hf isotopic compositions, as well as major and trace element data, for the granodiorites and their mafic microgranular enclaves (MMEs) in the Tuokesalei area, northwestern Chinese Altai. The granodiorites are characterized by peraluminous compositions (A/CNK=1.01-1.45), with relatively high SiO 2 (64.4 to 70.9wt.%) and low MgO (0.75 to 1.97wt.%) contents. These rocks possess low total rare earth element (REE) contents (67-187ppm) with weakly negative Eu anomalies and mantle-like whole-rock Nd-Sr isotopic compositions (ε Nd(t)=+2.5 to +4.5; ( 87Sr/ 86Sr) i=0.7038 to 0.7048) and zircon ε Hf(t) values (+5.93 to +12.9). The MMEs contain abundant magmatic amphiboles and needle-like apatites, have low SiO 2 (51.7 to 54.3wt.%) and high MgO (2.86 to 3.75wt.%) and REE contents (162-298ppm), and are characterized by moderately negative Eu anomalies (Eu/Eu*=0.40-0.60) and slightly depleted to enriched LREE ((La/Nd) N=0.74-1.41) and flat HREE ((Gd/Yb) N=1.16-1.39) patterns. The MMEs have whole-rock Nd-Sr isotopic compositions (ε Nd(t)=+2.6 to +2.7, ( 87Sr/ 86Sr) i=0.7034-0.7050) similar to those of the host granodiorites. Their similarities in crystallization age, mineral assemblage and isotopic composition document that the MMEs may represent an early crystallized phase, which was broken into pieces and brought to the shallow level during the host magma ascent and emplacement. Their precursor magmas were probably derived from an oceanic lithospheric mantle, which was characterized by pronounced Nd-Ta depletions. Mineral compositions of MMEs suggest that amphibole was a major early fractional mineral, which effectively differentiated the mantle-derived basaltic liquids to silica-rich melts. Zircon U-Pb dating yielded an age of 313±5Ma for the host granodiorites and 313±13Ma for their MMEs. The geochemical data of this study records an important episode of magmatism in an environment transitional from a subduction-related regime to a post-tectonic extension. Results of this study suggest that the accretionary orogenic process did not completely terminate until the Late Carboniferous to Permian in this region. © 2011 International Association for Gondwana Research.
 
dc.description.naturelink_to_subscribed_fulltext
 
dc.identifier.citationGondwana Research, 2012, v. 22 n. 2, p. 681-698 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gr.2011.11.008
 
dc.identifier.citeulike10164745
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.gr.2011.11.008
 
dc.identifier.epage698
 
dc.identifier.hkuros205433
 
dc.identifier.issn1342-937X
2013 Impact Factor: 8.122
2013 SCImago Journal Rankings: 3.898
 
dc.identifier.issue2
 
dc.identifier.scopuseid_2-s2.0-84863864922
 
dc.identifier.spage681
 
dc.identifier.urihttp://hdl.handle.net/10722/151350
 
dc.identifier.volume22
 
dc.languageeng
 
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
 
dc.publisher.placeNetherlands
 
dc.relation.ispartofGondwana Research
 
dc.subjectAccretionary orogenic belt
 
dc.subjectCaob
 
dc.subjectChinese altai
 
dc.subjectGeochemistry
 
dc.subjectGeochronology
 
dc.titleCarboniferous mantle-derived felsic intrusion in the Chinese Altai, NW China: implications for geodynamic change of the accretionary orogenic belt
 
dc.typeArticle
 
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<contributor.author>Xiao, W</contributor.author>
<contributor.author>Zhao, G</contributor.author>
<contributor.author>Long, X</contributor.author>
<contributor.author>Wu, F</contributor.author>
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<description.abstract>This paper reports whole-rock Sr-Nd and zircon U-Pb and Hf isotopic compositions, as well as major and trace element data, for the granodiorites and their mafic microgranular enclaves (MMEs) in the Tuokesalei area, northwestern Chinese Altai. The granodiorites are characterized by peraluminous compositions (A/CNK=1.01-1.45), with relatively high SiO 2 (64.4 to 70.9wt.%) and low MgO (0.75 to 1.97wt.%) contents. These rocks possess low total rare earth element (REE) contents (67-187ppm) with weakly negative Eu anomalies and mantle-like whole-rock Nd-Sr isotopic compositions (&#949; Nd(t)=+2.5 to +4.5; ( 87Sr/ 86Sr) i=0.7038 to 0.7048) and zircon &#949; Hf(t) values (+5.93 to +12.9). The MMEs contain abundant magmatic amphiboles and needle-like apatites, have low SiO 2 (51.7 to 54.3wt.%) and high MgO (2.86 to 3.75wt.%) and REE contents (162-298ppm), and are characterized by moderately negative Eu anomalies (Eu/Eu*=0.40-0.60) and slightly depleted to enriched LREE ((La/Nd) N=0.74-1.41) and flat HREE ((Gd/Yb) N=1.16-1.39) patterns. The MMEs have whole-rock Nd-Sr isotopic compositions (&#949; Nd(t)=+2.6 to +2.7, ( 87Sr/ 86Sr) i=0.7034-0.7050) similar to those of the host granodiorites. Their similarities in crystallization age, mineral assemblage and isotopic composition document that the MMEs may represent an early crystallized phase, which was broken into pieces and brought to the shallow level during the host magma ascent and emplacement. Their precursor magmas were probably derived from an oceanic lithospheric mantle, which was characterized by pronounced Nd-Ta depletions. Mineral compositions of MMEs suggest that amphibole was a major early fractional mineral, which effectively differentiated the mantle-derived basaltic liquids to silica-rich melts. Zircon U-Pb dating yielded an age of 313&#177;5Ma for the host granodiorites and 313&#177;13Ma for their MMEs. The geochemical data of this study records an important episode of magmatism in an environment transitional from a subduction-related regime to a post-tectonic extension. Results of this study suggest that the accretionary orogenic process did not completely terminate until the Late Carboniferous to Permian in this region. &#169; 2011 International Association for Gondwana Research.</description.abstract>
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<subject>Accretionary orogenic belt</subject>
<subject>Caob</subject>
<subject>Chinese altai</subject>
<subject>Geochemistry</subject>
<subject>Geochronology</subject>
<title>Carboniferous mantle-derived felsic intrusion in the Chinese Altai, NW China: implications for geodynamic change of the accretionary orogenic belt</title>
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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