Petrogenesis of the Syenogranite in the Xiaowulangou Area of Southern Great Xing’an Range: Constraints from Zircon LA-ICP-MS U-Pb Geochronology, Geochemistry and Hf Isotopes

被引：0
作者：
Zhang P. [1 ]
Peng B. [1 ]
Zhao J. [2 ]
Wang X. [2 ]
He J. [2 ]
Zhang A. [2 ]
Shuang L. [3 ]
机构：
[1] MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing
[2] Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Inner Mongolia Geological Survey Institute, Hohhot
[3] Inner Mongolia Minerals Experiment Research Institute, Hohhot
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 08期
关键词：
geochemistry; Hf isotopes; LA - ICP - MS U - Pb geochronology; Okhotsk Ocea; The west slop of Southern Great Xing’an Range; Mongol; Xiaowulangou;
D O I：
10.3799/dqkx.2021.129
中图分类号：
学科分类号：
摘要：
TheLate Jurassic-Early Cretaceous granites are widely developed in the west slop of Southern Great Xing’an Range, and an in-depth study of the petrogenesis is of great geological significance to reveal the Mesozoic geodynamic background and tectonic evolution. In this paper, we report for the zircon LA-ICP-MS U-Pb age and Hf isotopic data, whole-rock major and trace element composition data from Xiaowulangousyeno granite. LA-ICP-MS U-Pb dating yields a weighted mean of 139.4±0.7 Ma, indicating that Xiaowulangousyeno granite formed in the Early Cretaceous. Geochemically, the syenogranite belongs to Si-K-rich calc-alkaline series, A/CNK=1.00~1.11 and are weak peraluminous. The syenogranite enriched in Rb, Th, U(LILE) and light rare earth elements(LREE), relatively depleted in Ba, Sr, P, Ti(HFSE), withobvious Eu negative anomaly(δEu=0.007~0.009). In addition, the (Zr+Nb+Ce+Y) values of syenograniteis less than 350×10-6. The syenogranite contains magnetite, and no primary muscovite and alkaline mafic minerals. All these features above suggest that Xiaowulangousyenogranite belongs to highly fractionated I-type granite. The zircons εHf(t) values of syenogranite are +5.5~+8.9, and the two stage model ages (tDM2) range 700 Ma to 947 Ma. Combined with the reginoal geological background, we conclude that the Xiaowulangousyenograniteoriginated from the partial melting of upper Proterozoic meta-mafic rocks and middle Ordovician meta-andesite rocks under low pressure and high temperature, and the syenogranitewas the product of extension after the closure of Mongol-Okhotsk Ocean. © 2022 China University of Geosciences. All rights reserved.
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页码：2889 / 2901
页数：12
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共 49 条
  • [1] Boynton W.V., Geochemistry of the Rare Earth Elements: Meteorite Studies, Rare Earth Element Geochem⁃ istry, pp. 63-114, (1984)
  • [2] Beard J. S., Lofgren G. E., Dehydration Melting and Water - Saturated Melting of Basaltic and Andesitic Greenstones and Amphibolites at 1, 3, and 6.9 Kb, Jour⁃ nal of Petrology, 32, 2, pp. 365-401, (1991)
  • [3] Bedard J. H., A Catalytic Delamination-Driven Model for Coupled Genesis of Archaean Crust and Sub-Continental Lithospheric Mantle, Geochimica et Cosmochimi⁃ ca Acta, 70, 5, pp. 1188-1214, (2006)
  • [4] Clemens J. D., Stevens G., Farina F., The Enigmatic Sources of I - Type Granites: The Peritectic Connexion, Lithos, 126, 3, pp. 174-181, (2011)
  • [5] Defant M. J., Drummond M. S., Derivation of some Modern Arc Magmas by Melting of Young Subducted Lithosphere, Nature, 347, 6294, pp. 662-665, (1990)
  • [6] Ge W.C., Lin Q., Sun D.Y., Et al., Geochemical Research into Origins of Two Types of Mesozoic Rhyolites in DaXing’AnLing, Earth Science, 25, 2, pp. 172-178, (2000)
  • [7] Hou K.J., Li Y.H., Zhou T.R., Et al., Laser Ablation-MC-ICP-MS Technique for Hf Isotope Microanalysis of Zircon and Its Geological Applications, Acta Petro⁃ logica Sinica, 23, 10, pp. 2595-2604, (2007)
  • [8] Hou K.J., Li Y.H., Tian Y.R., In Situ U-Pb Zircon Dating Using Laser Ablation - Multi Ion Counting - ICP-MS, Mineral Deposits, 28, 4, pp. 481-492, (2009)
  • [9] Jiang X.J., Peng Y.B., Dong X.J., Et al., The Remote Role of Mongolia-Okhotsk Ocean: Evidences from the Origin of Rhyolite Porphyry in Yangpangou Area, the Southeast of Inner Mongolia, Earth Science, 46, 9, pp. 3057-3073, (2021)
  • [10] Li J.Y., Qian Y., Tekoumc L., Et al., Petrogenesis of Jurassic Granitoids on Liaodong Peninsula, Northeast China:Constraints on the Evolution of the Mongol-Okhotsk and Pacific Tectonic Regimes, Journal of Earth Science, 32, 1, pp. 127-143, (2021)
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