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Open AccessArticle

Paleoproterozoic Adakitic Rocks in Qingchengzi District, Northeastern Jiao-Liao-Ji Belt: Implications for Petrogenesis and Tectonism

by 1,2, 3, 1,* and 1,2
1
College of Earth Sciences, Jilin University, Changchun 130061, China
2
Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China
3
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 684; https://doi.org/10.3390/min10080684
Received: 21 June 2020 / Revised: 27 July 2020 / Accepted: 29 July 2020 / Published: 31 July 2020
Herein, zircon U-Pb geochronology, Lu-Hf isotopes, and whole-rock major and trace element geochemistry are presented for two Palaeoproterozoic granitic rocks in Qingchengzi district, northeastern Jiao-Liao-Ji Belt (JLJB). These new geochronological and geochemical data provide reference clues for exploring the petrogenesis and tectonic setting of Paleoproterozoic magmatic rocks in the Qingchengzi district, which further constrain the tectonic nature of the JLJB. Our zircon U-Pb dating denotes that the Paleoproterozoic magmatic events in the Qingchengzi district were emplaced at ~2163 Ma and ~1854 Ma, represented by granite porphyry and biotite granite, respectively. Geochemically, these Palaeoproterozoic rocks are characterized by high Sr (760–842 ppm), SiO2 (69.72–70.89 wt.%), and Al2O3 (15.53–16.78 wt.%) contents, low Y (2.1–9.0 ppm) and Yb (0.25–0.80 ppm) contents, which indicate an adakite affinity. Combined with Hf isotopic composition (εHf(t) = −1.5~+4.8; TDM2 = 3109~2560 Ma), we believe that the Paleoproterozoic adakitic magma originated from partial melting of the thickened lower crust material in the Meso-Neoarchean. Moreover, these rocks are enriched in light rare earth elements and large ion lithophilic elements (e.g., K, Rb, and Cs), and depleted in heavy rare earth elements and high field strength elements (e.g., Nb and Ta). These features are similar to magmatic rocks formed in an arc environment (either island arc or active continental margin) and are not consistent with an intraplate/intracontinental environment. According to this study and previous research results, we conclude that the arc–continent collision model is conducive to the Paleoproterozoic tectonic attribute of the JLJB, and the oceanic crust subduction between the Namgrim and Longgang blocks may have induced the widespread occurrence of magmatic events in the region. View Full-Text
Keywords: geochronology; geochemistry; Qingchengzi district; Jiao-Liao-Ji Belt geochronology; geochemistry; Qingchengzi district; Jiao-Liao-Ji Belt
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MDPI and ACS Style

Li, J.; Liu, H.; Wang, K.; Cai, W. Paleoproterozoic Adakitic Rocks in Qingchengzi District, Northeastern Jiao-Liao-Ji Belt: Implications for Petrogenesis and Tectonism. Minerals 2020, 10, 684. https://doi.org/10.3390/min10080684

AMA Style

Li J, Liu H, Wang K, Cai W. Paleoproterozoic Adakitic Rocks in Qingchengzi District, Northeastern Jiao-Liao-Ji Belt: Implications for Petrogenesis and Tectonism. Minerals. 2020; 10(8):684. https://doi.org/10.3390/min10080684

Chicago/Turabian Style

Li, Jian; Liu, Hanlun; Wang, Keyong; Cai, Wenyan. 2020. "Paleoproterozoic Adakitic Rocks in Qingchengzi District, Northeastern Jiao-Liao-Ji Belt: Implications for Petrogenesis and Tectonism" Minerals 10, no. 8: 684. https://doi.org/10.3390/min10080684

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