File Download
 
Links for fulltext
(May Require Subscription)
 
Supplementary

Article: Geochemical, Sr-Nd and zircon U-Pb-Hf isotopic studies of Late Carboniferous magmatism in the West Junggar, Xinjiang: Implications for ridge subduction?
  • Basic View
  • Metadata View
  • XML View
TitleGeochemical, Sr-Nd and zircon U-Pb-Hf isotopic studies of Late Carboniferous magmatism in the West Junggar, Xinjiang: Implications for ridge subduction?
 
AuthorsGeng, H1
Sun, M1
Yuan, C3
Xiao, W2
Xian, W1
Zhao, G1
Zhang, L4
Wong, K1
Wu, F2
 
KeywordsCentral Asian Orogenic Belt
Geochemistry
Granite
Junggar
Sr-Nd-Hf isotopes
U-Pb zircon
 
Issue Date2009
 
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
 
CitationChemical Geology, 2009, v. 266 n. 3-4, p. 373-398 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.chemgeo.2009.07.001
 
AbstractVoluminous granitic intrusions are distributed in the West Junggar, NW China, and they can be classified as the dioritic rocks, charnockite and alkali-feldspar granite groups. The dioritic rocks (SiO 2 = 50.4-63.8 wt.%) are calc-alkaline and Mg enriched (average MgO = 4.54 wt.%, Mg # = 0.39-0.64), with high Sr/Y ratios (average = 21.2), weak negative Eu (average Eu*/Eu = 0.80) and pronounced negative Nb-Ta anomalies. Their Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7035-0.7042, ε Nd(t) = 4.5-7.9, ε Hf(t) = 14.1-14.5) show a depleted mantle-like signature. These features are compatible with adakites derived from partial melting of subducted oceanic crust that interacted with mantle materials. The charnockites (SiO 2 = 60.0-65.3 wt.%) show transitional geochemical characteristics from calc-alkaline to alkaline, with weak negative Eu (average Eu*/Eu = 0.75) but pronounced negative Nb-Ta anomalies. Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7037-0.7039, ε Nd(t) = 5.2-8.0, ε Hf(t) = 13.9-14.7) also indicate a depleted source, suggesting melts from a hot, juvenile lower crust. Alkali-feldspar granites (SiO 2 = 70.0-78.4 wt.%) are alkali and Fe-enriched, and have distinct negative Eu and Nb-Ta anomalies (average Eu*/Eu = 0.26), low Sr/Y ratios (average = 2.11), and depleted Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7024-0.7045, ε Nd(t) = 5.1-8.9, ε Hf(t) = 13.7-14.2). These characteristics are also comparable with those of rocks derived from juvenile lower crust. Despite of the differences in petrology, geochemistry and possibly different origins, zircon ages indicate that these three groups of rocks were coevally emplaced at ~ 305 Ma. A ridge subduction model can account for the geochemical characteristics of these granitoids and coeval mafic rocks. As the "slab window" opened, upwelling asthenosphere provided enhanced heat flux and triggered voluminous magmatisms: partial melting of the subducting slab formed the dioritic rocks; partial melting of the hot juvenile lower crust produced charnockite and alkali-feldspar granite, and partial melting in the mantle wedge generated mafic rocks in the region. These results suggest that subduction was ongoing in the Late Carboniferous and, thus support that the accretion and collision in the Central Asian Orogenic Belt took place in North Xinjiang after 305 Ma, and possibly in the Permian. © 2009 Elsevier B.V. All rights reserved.
 
ISSN0009-2541
2013 Impact Factor: 3.482
2013 SCImago Journal Rankings: 1.927
 
DOIhttp://dx.doi.org/10.1016/j.chemgeo.2009.07.001
 
ISI Accession Number IDWOS:000270346400023
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong Research Grants CouncilHKU7043/07P
CAS/SAFEA International Partnership Program form Creative Research Teams
National Natural Science Foundation of China40725009
Funding Information:

This study was supported by research grants from the National Basic Research Program of China (2007CB411308), the Hong Kong Research Grants Council (HKU7043/07P), the CAS/SAFEA International Partnership Program form Creative Research Teams, and National Natural Science Foundation of China (40725009). This work is a contribution to ILP (ERAS, Topo-Central Asia) and IGCP 480. We are indebted to Dr. Mehmet Keskin and an anonymous reviewer for the constructive reviews and comments. We acknowledge Dr. Roberta Rudnick for her valuable comments and editorial work. Insightful comments from Professor Alfred Kroner and Professor Jianping Zheng improved an earlier version of the manuscript. Professor Alfred Kroner is thanked for the English polishing. Xiao Fu, Xiaoping Xia, Liewen Xie and Yueheng Yang are thanked for laboratory assistance. A HKU postgraduate studentship to Hongyan Geng is gratefully acknowledged.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorGeng, H
 
dc.contributor.authorSun, M
 
dc.contributor.authorYuan, C
 
dc.contributor.authorXiao, W
 
dc.contributor.authorXian, W
 
dc.contributor.authorZhao, G
 
dc.contributor.authorZhang, L
 
dc.contributor.authorWong, K
 
dc.contributor.authorWu, F
 
dc.date.accessioned2010-05-31T03:35:20Z
 
dc.date.available2010-05-31T03:35:20Z
 
dc.date.issued2009
 
dc.description.abstractVoluminous granitic intrusions are distributed in the West Junggar, NW China, and they can be classified as the dioritic rocks, charnockite and alkali-feldspar granite groups. The dioritic rocks (SiO 2 = 50.4-63.8 wt.%) are calc-alkaline and Mg enriched (average MgO = 4.54 wt.%, Mg # = 0.39-0.64), with high Sr/Y ratios (average = 21.2), weak negative Eu (average Eu*/Eu = 0.80) and pronounced negative Nb-Ta anomalies. Their Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7035-0.7042, ε Nd(t) = 4.5-7.9, ε Hf(t) = 14.1-14.5) show a depleted mantle-like signature. These features are compatible with adakites derived from partial melting of subducted oceanic crust that interacted with mantle materials. The charnockites (SiO 2 = 60.0-65.3 wt.%) show transitional geochemical characteristics from calc-alkaline to alkaline, with weak negative Eu (average Eu*/Eu = 0.75) but pronounced negative Nb-Ta anomalies. Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7037-0.7039, ε Nd(t) = 5.2-8.0, ε Hf(t) = 13.9-14.7) also indicate a depleted source, suggesting melts from a hot, juvenile lower crust. Alkali-feldspar granites (SiO 2 = 70.0-78.4 wt.%) are alkali and Fe-enriched, and have distinct negative Eu and Nb-Ta anomalies (average Eu*/Eu = 0.26), low Sr/Y ratios (average = 2.11), and depleted Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7024-0.7045, ε Nd(t) = 5.1-8.9, ε Hf(t) = 13.7-14.2). These characteristics are also comparable with those of rocks derived from juvenile lower crust. Despite of the differences in petrology, geochemistry and possibly different origins, zircon ages indicate that these three groups of rocks were coevally emplaced at ~ 305 Ma. A ridge subduction model can account for the geochemical characteristics of these granitoids and coeval mafic rocks. As the "slab window" opened, upwelling asthenosphere provided enhanced heat flux and triggered voluminous magmatisms: partial melting of the subducting slab formed the dioritic rocks; partial melting of the hot juvenile lower crust produced charnockite and alkali-feldspar granite, and partial melting in the mantle wedge generated mafic rocks in the region. These results suggest that subduction was ongoing in the Late Carboniferous and, thus support that the accretion and collision in the Central Asian Orogenic Belt took place in North Xinjiang after 305 Ma, and possibly in the Permian. © 2009 Elsevier B.V. All rights reserved.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationChemical Geology, 2009, v. 266 n. 3-4, p. 373-398 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.chemgeo.2009.07.001
 
dc.identifier.citeulike5294292
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.chemgeo.2009.07.001
 
dc.identifier.epage398
 
dc.identifier.hkuros161213
 
dc.identifier.isiWOS:000270346400023
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong Research Grants CouncilHKU7043/07P
CAS/SAFEA International Partnership Program form Creative Research Teams
National Natural Science Foundation of China40725009
Funding Information:

This study was supported by research grants from the National Basic Research Program of China (2007CB411308), the Hong Kong Research Grants Council (HKU7043/07P), the CAS/SAFEA International Partnership Program form Creative Research Teams, and National Natural Science Foundation of China (40725009). This work is a contribution to ILP (ERAS, Topo-Central Asia) and IGCP 480. We are indebted to Dr. Mehmet Keskin and an anonymous reviewer for the constructive reviews and comments. We acknowledge Dr. Roberta Rudnick for her valuable comments and editorial work. Insightful comments from Professor Alfred Kroner and Professor Jianping Zheng improved an earlier version of the manuscript. Professor Alfred Kroner is thanked for the English polishing. Xiao Fu, Xiaoping Xia, Liewen Xie and Yueheng Yang are thanked for laboratory assistance. A HKU postgraduate studentship to Hongyan Geng is gratefully acknowledged.

 
dc.identifier.issn0009-2541
2013 Impact Factor: 3.482
2013 SCImago Journal Rankings: 1.927
 
dc.identifier.issue3-4
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-68749092890
 
dc.identifier.spage373
 
dc.identifier.urihttp://hdl.handle.net/10722/58704
 
dc.identifier.volume266
 
dc.languageeng
 
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
 
dc.publisher.placeNetherlands
 
dc.relation.ispartofChemical Geology
 
dc.relation.referencesReferences in Scopus
 
dc.subjectCentral Asian Orogenic Belt
 
dc.subjectGeochemistry
 
dc.subjectGranite
 
dc.subjectJunggar
 
dc.subjectSr-Nd-Hf isotopes
 
dc.subjectU-Pb zircon
 
dc.titleGeochemical, Sr-Nd and zircon U-Pb-Hf isotopic studies of Late Carboniferous magmatism in the West Junggar, Xinjiang: Implications for ridge subduction?
 
dc.typeArticle
 
<?xml encoding="utf-8" version="1.0"?>
<item><contributor.author>Geng, H</contributor.author>
<contributor.author>Sun, M</contributor.author>
<contributor.author>Yuan, C</contributor.author>
<contributor.author>Xiao, W</contributor.author>
<contributor.author>Xian, W</contributor.author>
<contributor.author>Zhao, G</contributor.author>
<contributor.author>Zhang, L</contributor.author>
<contributor.author>Wong, K</contributor.author>
<contributor.author>Wu, F</contributor.author>
<date.accessioned>2010-05-31T03:35:20Z</date.accessioned>
<date.available>2010-05-31T03:35:20Z</date.available>
<date.issued>2009</date.issued>
<identifier.citation>Chemical Geology, 2009, v. 266 n. 3-4, p. 373-398</identifier.citation>
<identifier.issn>0009-2541</identifier.issn>
<identifier.uri>http://hdl.handle.net/10722/58704</identifier.uri>
<description.abstract>Voluminous granitic intrusions are distributed in the West Junggar, NW China, and they can be classified as the dioritic rocks, charnockite and alkali-feldspar granite groups. The dioritic rocks (SiO 2 = 50.4-63.8 wt.%) are calc-alkaline and Mg enriched (average MgO = 4.54 wt.%, Mg # = 0.39-0.64), with high Sr/Y ratios (average = 21.2), weak negative Eu (average Eu*/Eu = 0.80) and pronounced negative Nb-Ta anomalies. Their Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7035-0.7042, &#949; Nd(t) = 4.5-7.9, &#949; Hf(t) = 14.1-14.5) show a depleted mantle-like signature. These features are compatible with adakites derived from partial melting of subducted oceanic crust that interacted with mantle materials. The charnockites (SiO 2 = 60.0-65.3 wt.%) show transitional geochemical characteristics from calc-alkaline to alkaline, with weak negative Eu (average Eu*/Eu = 0.75) but pronounced negative Nb-Ta anomalies. Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7037-0.7039, &#949; Nd(t) = 5.2-8.0, &#949; Hf(t) = 13.9-14.7) also indicate a depleted source, suggesting melts from a hot, juvenile lower crust. Alkali-feldspar granites (SiO 2 = 70.0-78.4 wt.%) are alkali and Fe-enriched, and have distinct negative Eu and Nb-Ta anomalies (average Eu*/Eu = 0.26), low Sr/Y ratios (average = 2.11), and depleted Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7024-0.7045, &#949; Nd(t) = 5.1-8.9, &#949; Hf(t) = 13.7-14.2). These characteristics are also comparable with those of rocks derived from juvenile lower crust. Despite of the differences in petrology, geochemistry and possibly different origins, zircon ages indicate that these three groups of rocks were coevally emplaced at ~ 305 Ma. A ridge subduction model can account for the geochemical characteristics of these granitoids and coeval mafic rocks. As the &quot;slab window&quot; opened, upwelling asthenosphere provided enhanced heat flux and triggered voluminous magmatisms: partial melting of the subducting slab formed the dioritic rocks; partial melting of the hot juvenile lower crust produced charnockite and alkali-feldspar granite, and partial melting in the mantle wedge generated mafic rocks in the region. These results suggest that subduction was ongoing in the Late Carboniferous and, thus support that the accretion and collision in the Central Asian Orogenic Belt took place in North Xinjiang after 305 Ma, and possibly in the Permian. &#169; 2009 Elsevier B.V. All rights reserved.</description.abstract>
<language>eng</language>
<publisher>Elsevier BV. The Journal&apos;s web site is located at http://www.elsevier.com/locate/chemgeo</publisher>
<relation.ispartof>Chemical Geology</relation.ispartof>
<subject>Central Asian Orogenic Belt</subject>
<subject>Geochemistry</subject>
<subject>Granite</subject>
<subject>Junggar</subject>
<subject>Sr-Nd-Hf isotopes</subject>
<subject>U-Pb zircon</subject>
<title>Geochemical, Sr-Nd and zircon U-Pb-Hf isotopic studies of Late Carboniferous magmatism in the West Junggar, Xinjiang: Implications for ridge subduction?</title>
<type>Article</type>
<identifier.openurl>http://library.hku.hk:4550/resserv?sid=HKU:IR&amp;issn=0009-2541&amp;volume=266&amp;issue=3-4&amp;spage=364&amp;epage=389&amp;date=2009&amp;atitle=Geochemical,+Sr&#8211;Nd+and+zircon+U&#8211;Pb&#8211;Hf+isotopic+studies+of+Late+Carboniferous+magmatism+in+the+West+Junggar,+Xinjiang:+implications+for+ridge+subduction?</identifier.openurl>
<description.nature>Link_to_subscribed_fulltext</description.nature>
<identifier.doi>10.1016/j.chemgeo.2009.07.001</identifier.doi>
<identifier.scopus>eid_2-s2.0-68749092890</identifier.scopus>
<identifier.hkuros>161213</identifier.hkuros>
<relation.references>http://www.scopus.com/mlt/select.url?eid=2-s2.0-68749092890&amp;selection=ref&amp;src=s&amp;origin=recordpage</relation.references>
<identifier.volume>266</identifier.volume>
<identifier.issue>3-4</identifier.issue>
<identifier.spage>373</identifier.spage>
<identifier.epage>398</identifier.epage>
<identifier.isi>WOS:000270346400023</identifier.isi>
<publisher.place>Netherlands</publisher.place>
<identifier.citeulike>5294292</identifier.citeulike>
</item>
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
  4. Peking University