LA-ICP-MS zircon U-Pb dating, geochemistry and tectonic implications of the Neoproterozoic Xiaoxigong granite at Dunhuang block, northeastern Tarim, NW China

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• 作者：Jiang Zhu ; Xinbiao Lv ; Sanguo Peng
• 关键词：A ; type granite ; zircon U ; Pb ; Hf isotopes ; geochemistry ; Xiaoxigong ; northeast Tarim
• 刊名：Geosciences Journal
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：19
• 期：4
• 页码：697-708
• 全文大小：972 KB
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• 作者单位：Jiang Zhu (1) (2) (3)
  Xinbiao Lv (3)
  Sanguo Peng (1)
  
  1. Wuhan Center, China Geological Survey, Wuhan, 430205, China
  2. Research Center of Granitic Diagenesis and Mineralization, China Geological Survey, Wuhan, 430205, China
  3. Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geosciences
  
• 出版者：The Geological Society of Korea, co-published with Springer
• ISSN：1598-7477

文摘

We present new zircon U-Pb ages, Hf isotopes, and whole-rock geochemistry of the Xiaoxigong granite pluton in the Dunhuang block, northeastern Tarim Craton. LA-ICPMS zircon U-Pb dating yields a weighted mean 206Pb/238U age of 841.3 ± 8.1 Ma (MSWD = 4.4), interpreted as the emplacement age of the Xiaoxigong granite. Zircons have εHf(t) values ranging from +4.53 to +8.63 and TDM2 model ages from 1.16 to 1.38 Ga. Geochemical characteristics show that the granite belongs to the shoshonite series and has weakly peraluminous-metaluminous features. It is enriched in Si, K, Na, Rb, Th and REE, and has elevated Ga/Al ratios and high (Zr + Nb + Ce + Y) abundance, and is depleted in Mg, Ca, Mn, Ba, Sr, P and Ti. The REE composition shows significant negative Eu anomalies (Eu/Eu* = 0.18-.31) and low (La/Yb)_N (4.54-.33). It is typical aluminous A-type granite. The geochemical and Hf isotopic signatures suggest that the Neoproterozoic Xiaoxigong granite was generated by partial melting of crustal rocks during the the post-orogenic period. Key words A-type granite zircon U-Pb-Hf isotopes geochemistry Xiaoxigong northeast Tarim