Article: Geochronological and geochemical study of mafic dykes from the northwest Chinese Altai: Implications for petrogenesis and tectonic evolution
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| Title | Geochronological and geochemical study of mafic dykes from the northwest Chinese Altai: Implications for petrogenesis and tectonic evolution | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Authors | Cai, K1 Sun, M1 Yuan, C3 Zhao, G1 Xiao, W2 Long, X3 Wu, F2 | ||||||||||
| Keywords | CAOB Chinese Altai Geochemistry Mafic dykes Ridge subduction | ||||||||||
| Issue Date | 2010 | ||||||||||
| Publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr | ||||||||||
| Citation | Gondwana Research, 2010, v. 18 n. 4, p. 638-652 [How to Cite?] DOI: http://dx.doi.org/10.1016/j.gr.2010.02.010 | ||||||||||
| Abstract | Fifteen 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. | ||||||||||
| ISSN | 1342-937X 2011 Impact Factor: 6.659 2011 SCImago Journal Rankings: 0.098 | ||||||||||
| DOI | http://dx.doi.org/10.1016/j.gr.2010.02.010 | ||||||||||
| ISI Accession Number ID | WOS:000283006800007
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. | ||||||||||
| References | References in Scopus |
| dc.contributor.author | Cai, K | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| dc.contributor.author | Sun, M | ||||||||||
| dc.contributor.author | Yuan, C | ||||||||||
| dc.contributor.author | Zhao, G | ||||||||||
| dc.contributor.author | Xiao, W | ||||||||||
| dc.contributor.author | Long, X | ||||||||||
| dc.contributor.author | Wu, F | ||||||||||
| dc.date.accessioned | 2011-09-23T05:46:32Z | ||||||||||
| dc.date.available | 2011-09-23T05:46:32Z | ||||||||||
| dc.date.issued | 2010 | ||||||||||
| dc.description.abstract | Fifteen 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.nature | Link_to_subscribed_fulltext | ||||||||||
| dc.identifier.citation | Gondwana 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.doi | http://dx.doi.org/10.1016/j.gr.2010.02.010 | ||||||||||
| dc.identifier.epage | 652 | ||||||||||
| dc.identifier.hkuros | 193928 | ||||||||||
| dc.identifier.isi | WOS:000283006800007
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.issn | 1342-937X 2011 Impact Factor: 6.659 2011 SCImago Journal Rankings: 0.098 | ||||||||||
| dc.identifier.issue | 4 | ||||||||||
| dc.identifier.openurl | | ||||||||||
| dc.identifier.scopus | eid_2-s2.0-77956493820 | ||||||||||
| dc.identifier.spage | 638 | ||||||||||
| dc.identifier.uri | http://hdl.handle.net/10722/139195 | ||||||||||
| dc.identifier.volume | 18 | ||||||||||
| dc.language | eng | ||||||||||
| dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr | ||||||||||
| dc.publisher.place | Netherlands | ||||||||||
| dc.relation.ispartof | Gondwana Research | ||||||||||
| dc.relation.references | References in Scopus | ||||||||||
| dc.subject | CAOB | ||||||||||
| dc.subject | Chinese Altai | ||||||||||
| dc.subject | Geochemistry | ||||||||||
| dc.subject | Mafic dykes | ||||||||||
| dc.subject | Ridge subduction | ||||||||||
| dc.title | Geochronological and geochemical study of mafic dykes from the northwest Chinese Altai: Implications for petrogenesis and tectonic evolution | ||||||||||
| dc.type | Article |
Author Affiliations
- The University of Hong Kong
- Institute of Geology and Geophysics Chinese Academy of Sciences
- Guangzhou Institute of Geochemistry Chinese Academy of Sciences