globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-014-1056-z
Scopus记录号: 2-s2.0-84939897902
论文题名:
Geochemistry and zircon ages of mafic dikes in the South Qinling, central China: evidence for late Neoproterozoic continental rifting in the northern Yangtze block
作者: Zhu X.; Chen F.; Liu B.; Zhang H.; Zhai M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 104, 期:1
起始页码: 27
结束页码: 44
语种: 英语
英文关键词: Geochemistry ; Mafic dike ; Neoproterozoic ; South Qinling ; Zircon age
英文摘要: Neoproterozoic volcanic–sedimentary sequences of the southern Qinling belt, central China, were intruded by voluminous mafic dikes. secondary ion mass spectrometry zircon U–Pb dating indicates that these dikes were emplaced at 650.8 ± 5.2 Ma, coeval with mafic rocks occurring at the northern margin of the Yangtze block. The dikes are characterized by enrichment of large ion lithophile elements, high Ti contents (up to 3.73 wt%) and Nb/Ta ratios between 14.5 and 19.6, suggesting a mantle source of oceanic island basalt affinity. Initial 87Sr/86Sr ratios show positive correlation with SiO2 contents and negative correlation with Zr/Nb ratios, implying that these rocks were affected by crustal contamination during the magma ascend and emplacement process. The dikes have initial εNd values of +0.2 to +3.3, low 206Pb/204Pb ratios of 16.96–17.45, and moderate 87Sr/86Sr ratios of 0.7043–0.7076, likely pointing to the involvement of an enriched mantle source. The mafic dikes and coeval mafic volcanic equivalents in the South Qinling and the northern Yangtze are hypothesized to be related with the prolonged breakup of the supercontinent Rodinia, suggesting that continental rifting lasted until ca. 650 Ma. © 2014, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84939897902&doi=10.1007%2fs00531-014-1056-z&partnerID=40&md5=91f8ec89b0f5b92b8d07361eafe83eda
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70473
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang, China; Key Laboratory of Crust-Mantle Materials and Environments, School of Earth Sciences, University of Science and Technology of China, Hefei, China

Recommended Citation:
Zhu X.,Chen F.,Liu B.,et al. Geochemistry and zircon ages of mafic dikes in the South Qinling, central China: evidence for late Neoproterozoic continental rifting in the northern Yangtze block[J]. International Journal of Earth Sciences,2014-01-01,104(1)
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