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Article: Geochronological and geochemical study of mafic dykes from the northwest Chinese Altai: Implications for petrogenesis and tectonic evolution
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TitleGeochronological and geochemical study of mafic dykes from the northwest Chinese Altai: Implications for petrogenesis and tectonic evolution
 
AuthorsCai, K1
Sun, M1
Yuan, C3
Zhao, G1
Xiao, W2
Long, X3
Wu, F2
 
KeywordsCAOB
Chinese Altai
Geochemistry
Mafic dykes
Ridge subduction
 
Issue Date2010
 
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
 
CitationGondwana Research, 2010, v. 18 n. 4, p. 638-652 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gr.2010.02.010
 
AbstractFifteen zircons separated from a mafic dyke in the Chinese Altai give a concordant age population with a weighted mean 206Pb/ 238U age of 375.5±4.8Ma, suggesting a Devonian emplacement. On the basis of their mineralogical compositions and textures, the coeval dykes can be divided into gabbroic and doleritic types. They are both sub-alkaline, tholeiitic, characterized by similarly low SiO 2 contents (45.2-52.7wt.%) and total alkaline (K 2O+Na 2O=0.99-4.93wt.%). Rare earth element patterns of the gabbroic dykes are similar to N-MORB (La/Yb N=0.86-1.1), together with their high ε Nd(t) values (+7.6 to +8.1), indicating that their precursor magma was mainly derived from a N-MORB-type depleted asthenospheric mantle. While the REE patterns of the doleritic dykes resemble that of E-MORB (La/Yb N=1.12-2.28), enriched in LILEs and strongly depleted in HFSEs, with relative low ε Nd(t) values (+3.4 to +5.4) and high initial 87Sr/ 86Sr ratios (0.7057-0.7060). The zircon Hf isotopic analysis of the doleritic dykes give ε Hf(t) values from +10.7 to +13.8. These signatures suggest that a depleted mantle wedge metasomatized by slab-derived fluids and/or melts was possibly involved in the generation of the doleritic magma. The refractory peridotite may have been melted with variable degrees caused by upwelling of the hot asthenosphere. The petrogenesis of the mafic dykes suggest a high heat flux as a result of upwelling of the hot asthenosphere and the contrast geochemical signatures can be interpreted by a ridge subduction, which could be an important tectonic control in the accretionary process of the Chinese Altai. © 2010 International Association for Gondwana Research.
 
ISSN1342-937X
2012 Impact Factor: 7.396
2012 SCImago Journal Rankings: 3.115
 
DOIhttp://dx.doi.org/10.1016/j.gr.2010.02.010
 
ISI Accession Number IDWOS:000283006800007
Funding AgencyGrant Number
Chinese National 973 Program2007CB411308
Hong Kong Research Grants CouncilHKU704307P
NSFC40725009
Hong Kong University
Funding Information:

This study was financially supported by funds from the Chinese National 973 Program (2007CB411308), the Hong Kong Research Grants Council (HKU704307P), the NSFC (40725009) and Hong Kong University grants. We appreciate Kenny Wong, Xiaoping Xia, Hongyan Geng, Jiyuan Yin, Yingde Jiang, Yujing Wang for field assistance. We thank Biao Song, Liewen Xie, Yueheng Yang, Ying Liu, Xianglin Tu and Xirong Liang for laboratory assistance. We appreciate Mr. Jiangfeng Gao and Dr. Junhong Zhao for scientific discussion. We are very grateful to Prof. Ali Polat and an anonymous reviewer for their critical reviews and constructive comments that significantly improved this manuscript.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorCai, K
 
dc.contributor.authorSun, M
 
dc.contributor.authorYuan, C
 
dc.contributor.authorZhao, G
 
dc.contributor.authorXiao, W
 
dc.contributor.authorLong, X
 
dc.contributor.authorWu, F
 
dc.date.accessioned2011-09-23T05:46:32Z
 
dc.date.available2011-09-23T05:46:32Z
 
dc.date.issued2010
 
dc.description.abstractFifteen zircons separated from a mafic dyke in the Chinese Altai give a concordant age population with a weighted mean 206Pb/ 238U age of 375.5±4.8Ma, suggesting a Devonian emplacement. On the basis of their mineralogical compositions and textures, the coeval dykes can be divided into gabbroic and doleritic types. They are both sub-alkaline, tholeiitic, characterized by similarly low SiO 2 contents (45.2-52.7wt.%) and total alkaline (K 2O+Na 2O=0.99-4.93wt.%). Rare earth element patterns of the gabbroic dykes are similar to N-MORB (La/Yb N=0.86-1.1), together with their high ε Nd(t) values (+7.6 to +8.1), indicating that their precursor magma was mainly derived from a N-MORB-type depleted asthenospheric mantle. While the REE patterns of the doleritic dykes resemble that of E-MORB (La/Yb N=1.12-2.28), enriched in LILEs and strongly depleted in HFSEs, with relative low ε Nd(t) values (+3.4 to +5.4) and high initial 87Sr/ 86Sr ratios (0.7057-0.7060). The zircon Hf isotopic analysis of the doleritic dykes give ε Hf(t) values from +10.7 to +13.8. These signatures suggest that a depleted mantle wedge metasomatized by slab-derived fluids and/or melts was possibly involved in the generation of the doleritic magma. The refractory peridotite may have been melted with variable degrees caused by upwelling of the hot asthenosphere. The petrogenesis of the mafic dykes suggest a high heat flux as a result of upwelling of the hot asthenosphere and the contrast geochemical signatures can be interpreted by a ridge subduction, which could be an important tectonic control in the accretionary process of the Chinese Altai. © 2010 International Association for Gondwana Research.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationGondwana Research, 2010, v. 18 n. 4, p. 638-652 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gr.2010.02.010
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.gr.2010.02.010
 
dc.identifier.epage652
 
dc.identifier.hkuros193928
 
dc.identifier.isiWOS:000283006800007
Funding AgencyGrant Number
Chinese National 973 Program2007CB411308
Hong Kong Research Grants CouncilHKU704307P
NSFC40725009
Hong Kong University
Funding Information:

This study was financially supported by funds from the Chinese National 973 Program (2007CB411308), the Hong Kong Research Grants Council (HKU704307P), the NSFC (40725009) and Hong Kong University grants. We appreciate Kenny Wong, Xiaoping Xia, Hongyan Geng, Jiyuan Yin, Yingde Jiang, Yujing Wang for field assistance. We thank Biao Song, Liewen Xie, Yueheng Yang, Ying Liu, Xianglin Tu and Xirong Liang for laboratory assistance. We appreciate Mr. Jiangfeng Gao and Dr. Junhong Zhao for scientific discussion. We are very grateful to Prof. Ali Polat and an anonymous reviewer for their critical reviews and constructive comments that significantly improved this manuscript.

 
dc.identifier.issn1342-937X
2012 Impact Factor: 7.396
2012 SCImago Journal Rankings: 3.115
 
dc.identifier.issue4
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-77956493820
 
dc.identifier.spage638
 
dc.identifier.urihttp://hdl.handle.net/10722/139195
 
dc.identifier.volume18
 
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.relation.referencesReferences in Scopus
 
dc.subjectCAOB
 
dc.subjectChinese Altai
 
dc.subjectGeochemistry
 
dc.subjectMafic dykes
 
dc.subjectRidge subduction
 
dc.titleGeochronological and geochemical study of mafic dykes from the northwest Chinese Altai: Implications for petrogenesis and tectonic evolution
 
dc.typeArticle
 
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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