We report herein on new zircon U–Pb ages, the major and trace elements of whole-rock, and the Sr–Nd–Hf isotope composition for adakitic intrusives collected from the West Ujimqin district in the Southeast region of the Central Asian Orogenic Belt (CAOB). These data provide important constraints on the petrogenetic evolution and geodynamic setting of late Permian magmatism in the Southeast CAOB. The U–Pb dating of zircon shows that the ages of Seerbeng pluton and Nuhetingshala pluton in West Ujimqin are 255.3 ± 0.71 and 254.4 ± 1.2 Ma, respectively, which signifies that these are products of magmatic activity in the late Permian. The adakitic intrusives are characterized by high levels of Sr (Sr ≥ 741 ppm), low Y, low Yb, high Sr:Y ratios, and strongly fractionated rare earth elements (10.3 < LaN/YbN < 22.5), which is similar to the features of the adakite. The magmatic zircons exhibit positive Hf values (+8.1 to +13.3), and young two-stage model ages vary from 430 to 760 Ma. The high εNd(t) and low (87Sr:86Sr)i indicate that the adakitic granite derived from the partial melting of subducted oceanic slab. The high level of Mg# [100 × Mg/(Mg + Fe) in atomic number] and abundant Cr–Ni indicate that magmatic melts interacted with olivine rocks in the mantle. Considering these results and the regional rock assemblies, we conclude that the Paleo-Asian Ocean had not yet completely closed in the late Permian, and northward subduction continued, with the subducted slab possibly breaking off.
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Research Article|
November 17, 2021
Geochronology, geochemistry, Sr–Nd–Hf isotope composition of the late Permian adakite in West Ujimqin, Inner Mongolia: petrogenesis and tectonic implications
Yuxu Fan;
Yuxu Fan
a
Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot 010020, China.b
Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China.
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Qinghui Xiao;
b
Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China.Corresponding author: Qinghui Xiao (email: qinghuixiao@126.com).
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Tingdong Li;
Tingdong Li
b
Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China.
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Yang Cheng;
Yang Cheng
a
Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot 010020, China.c
Institute of Mineral Resources, China Metallurgical Geology Administration, Beijing, 101300, China.
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Yan Li;
Yan Li
a
Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot 010020, China.c
Institute of Mineral Resources, China Metallurgical Geology Administration, Beijing, 101300, China.
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Lingjun Guo;
Lingjun Guo
a
Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot 010020, China.
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Pengyue Luo
Pengyue Luo
a
Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot 010020, China.
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Canadian Journal of Earth Sciences (2022) 59 (1): 46–58.
Article history
received:
05 Jan 2019
accepted:
30 Sep 2019
first online:
17 Jan 2022
Citation
Yuxu Fan, Qinghui Xiao, Tingdong Li, Yang Cheng, Yan Li, Lingjun Guo, Pengyue Luo; Geochronology, geochemistry, Sr–Nd–Hf isotope composition of the late Permian adakite in West Ujimqin, Inner Mongolia: petrogenesis and tectonic implications. Canadian Journal of Earth Sciences 2021;; 59 (1): 46–58. doi: https://doi.org/10.1139/cjes-2019-0002
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Index Terms/Descriptors
- absolute age
- adakites
- alkaline earth metals
- Asia
- China
- Far East
- geochemistry
- hafnium
- igneous rocks
- Inner Mongolia China
- magmatism
- metals
- neodymium
- nesosilicates
- orthosilicates
- Paleozoic
- Permian
- rare earths
- silicates
- strontium
- U/Pb
- Upper Permian
- volcanic rocks
- zircon
- zircon group
- Paleo-Asian Ocean
- Central Asian orogenic belt
- West Ujimqin China
- Nuhetingshala Pluton
- Seerbeng Pluton
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