Zircon U-Pb Age and Geochemistry of Ningjiawan Pluton in Lüliang Region and Their Geological Significances

被引：0
|
作者：
Pang F. [1 ]
Li Q. [1 ]
Liu S. [1 ]
Wang Z. [2 ]
Liu Z. [1 ]
Mei K. [1 ]
机构：
[1] Key Laboratory of Orogenic Belts and Crustal Evolution (MOE), School of Earth and Space Sciences, Peking University, Beijing
[2] Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing
来源：
Beijing Daxue Xuebao (Ziran Kexue Ban)/Acta Scientiarum Naturalium Universitatis Pekinensis | 2019年 / 55卷 / 01期
关键词：
Highly fractionated I-type granite; Island arc setting; Ningjiawan pluton; North China Craton; Zircon U-Pb dating;
D O I：
10.13209/j.0479-8023.2018.034
中图分类号：
学科分类号：
摘要：
Field investigations, petrology, geochemistry, zircon U-Pb geochronology and Hf isotope analysis were performed to investigate the petrogenesis of Ningjiawan pluton, in an attempt to shed light on its geodynamic significance. LA-ICP-MS zircon U-Pb dating from two samples yielded ages of 2364±6 Ma (MSWD=0.13) and 2360±23 Ma (MSWD=4.0) respectively, indicating that the magma emplaced and crystalized in Paleoproterozoic. The pluton contains high concentrations of alkaline, K and Si, had elevated FeOT/MgO ratios and high field strength element (HFSE) contents, was enriched in Rb, Ba, Th and U elements, was depleted in Ca, Mg, P and Ti, and possessed a "seagull-type" chondrite-normalied REE pattern with significantly negative Eu anomalies (δEu =0.13-0.36) and enrichment in the LREE relative to the HREE, exhibiting the traits of the highly fractionated I-type granite. Relatively high whole-rock Y/Nb values (1.2-2.8), together with positive εHf(t) values (+1.6-+6.4), and tDM1(Hf) and tDM2(Hf) ages of 2449-2629 Ma and 2474-2711 Ma respectively on the zircon grains, signified that they were products derived from magma mixing between crust and depleted mantle sources. Moreover, distinctive negative Nb, P and Ti anomalies and positive Ce, Nd and Zr anomalies, characteristics of continental margin arc, combining with the regional geological background, indicate that Ningjiawan pluton is very likely to form in island arc setting. © 2019 Peking University.
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页码：133 / 147
页数：14
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共 52 条
  • [1] Liu D.Y., Nutman A.P., Compston W., Et al., Remants of ≥3800 Ma crust in the Chinese part of the Sino-Korean craton, Geology, 20, 4, pp. 339-342, (1992)
  • [2] Zhai M.G., Santosh M., The Early Precambrian odyssey of the North China Craton: a synoptic overview, Gondwana Research, 20, 1, pp. 6-25, (2011)
  • [3] Zhao G.C., Wilde S.A., Cawood P.A., Et al., Archean blocks and their boundaries in the North China Craton: lithological, geochemical, structural and P-T path constraints and tectonic evolution, Precambrian Research, 107, 1-2, pp. 45-73, (2001)
  • [4] Zhao G.C., Sun M., Wilde S.A., Et al., Late Archean to Paleoproterozoic evolution of the North China Craton: key issues revisited, Precambrian Research, 136, 2, pp. 177-202, (2005)
  • [5] Wilde S.A., Zhao G.C., Sun M., Development of the North China Craton during the Late Archaean and its final amalgamation at 1.8 Ga: some speculations on its position within a global Palaeoproterozoic supercontinent, Gondwana Research, 5, 1, pp. 85-94, (2002)
  • [6] Kroner A., Wilde S.A., Li J.H., Et al., Age and evolution of a Late Archean to Paleoproterozoic upper to lower crustal section in the Wutaishan/Hengshan/Fuping terrain of northern China, Journal of Asian Earth Sciences, 24, 5, pp. 577-595, (2005)
  • [7] Kroner A., Wilde S.A., O'Brien P.J., Et al., Field relationships, geochemistry, zircon ages and evolution of a Late Archaean to Palaeoproterozoic lower crustal section in the Hengshan terrain of Northern China, Acta Geologica Sinica (English Edition), 79, 5, pp. 605-632, (2005)
  • [8] Wilde S.A., Zhao G.C., Archean to Paleoproterozoic evolution of the North China Craton, Precambrian Research, 24, 5, pp. 519-522, (2005)
  • [9] Zhang J., Zhao G.C., Li S.W., Et al., Deformation history of the Hengshan complex: implications for the tec-tonic evolution of the Trans-North China Orogen, Journal of Structural Geology, 29, 6, pp. 933-949, (2007)
  • [10] Kusky T.M., Li J.H., Paleoproterozoic tectonic evo-lution of the North China Craton, Journal of Asian Earth Sciences, 22, 4, pp. 383-397, (2003)
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