The geochemistry and Sr–Nd isotope, zircon U–Pb, and zircon Hf isotope compositions are reported for monzogranites and granodiorites from the Hazhu area in the northern Beishan orogen, northwestern China. Zircon U–Pb dating yielded ages of 270.1 ± 1.1 and 277.4 ± 1.2 Ma for the monzogranites and 263.6 ± 1.2 and 262.2 ± 1.1 Ma for the granodiorites. These monzogranites and granodiorites are metaluminous to weakly peraluminous I-type and belong to mid-K calc-alkaline and high-K calc-alkaline series. They exhibit high Mg# values and moderate degrees of differentiation (D.I. = 70.7–88.1). They are enriched in large-ion lithophile elements and light rare earth elements and depleted in high field strength elements. They show high (87Sr/86Sr)i ratios of 0.6995–0.7070 and high εNd(t) values of 4.37–5.70 with Nd model ages (TDM) of 522–789 Ma, suggesting a juvenile crustal origin. Furthermore, their εHf(t) values are all positive, and Hf isotopic crustal model ages ( = 394–1097 Ma) also indicate a juvenile crustal origin. According to the data obtained in this study and other regional geological data acquired recently, the Hazhu granitoids were derived from common sources of melting from the Neoproterozoic to late Paleozoic juvenile crusts. The younger intrusions (granodiorites) are more basic, likely as a result of more juvenile lower crust being melted along with asthenospheric upwelling, which led to the addition of more basic components. These granitoids formed in a post-collisional setting. The tectonic regime transformed from an arc-related compressional setting to post-collisional extension, likely as a result of lithospheric extension and thinning in response to oceanic lithospheric delamination. These granitoids in the northern Beishan orogen were probably emplaced in a post-collisional extensional setting and suggest vertical continental crustal growth in the southern Central Asian Orogenic Belt.
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Research Article|
October 22, 2019
Early–Middle Permian post-collisional granitoids in the northern Beishan orogen, northwestern China: evidence from U–Pb ages and Sr–Nd–Hf isotopes
Min Li;
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
Corresponding author: Min Li (email: [email protected]).
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Houtian Xin;
Houtian Xin
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
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Bangfang Ren;
Bangfang Ren
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
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Yunwei Ren;
Yunwei Ren
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
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Wengang Liu
Wengang Liu
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
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Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
Houtian Xin
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
Bangfang Ren
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
Yunwei Ren
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
Wengang Liu
Tianjin Center, China Geological Survey, Tianjian, 300170, China; North China Center for Geoscience Innovation, Tianjian, 300170, China.
Corresponding author: Min Li (email: [email protected]).
Publisher: Canadian Science Publishing
Received:
25 May 2019
Accepted:
12 Oct 2019
First Online:
09 Jun 2020
Online ISSN: 1480-3313
Print ISSN: 0008-4077
Published by NRC Research Press
Canadian Journal of Earth Sciences (2020) 57 (6): 681–697.
Article history
Received:
25 May 2019
Accepted:
12 Oct 2019
First Online:
09 Jun 2020
Citation
Min Li, Houtian Xin, Bangfang Ren, Yunwei Ren, Wengang Liu; Early–Middle Permian post-collisional granitoids in the northern Beishan orogen, northwestern China: evidence from U–Pb ages and Sr–Nd–Hf isotopes. Canadian Journal of Earth Sciences 2019;; 57 (6): 681–697. doi: https://doi.org/10.1139/cjes-2019-0088
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Index Terms/Descriptors
- absolute age
- alkaline earth metals
- Asia
- chemical composition
- China
- Far East
- genesis
- granites
- granodiorites
- hafnium
- Hf-177/Hf-176
- igneous rocks
- Inner Mongolia China
- isotope ratios
- isotopes
- magmatism
- metals
- monzogranite
- Nd-144/Nd-143
- neodymium
- nesosilicates
- orthosilicates
- Paleozoic
- Permian
- plutonic rocks
- rare earths
- silicates
- Sr-87/Sr-86
- stable isotopes
- strontium
- tectonics
- U/Pb
- zircon
- zircon group
- Beishan Mountains
- Central Asian orogenic belt
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