首页|Petrogenesis and Tectonic Implications of Jurassic Granites in the Xingcheng Area, Northeastern North China Craton
Petrogenesis and Tectonic Implications of Jurassic Granites in the Xingcheng Area, Northeastern North China Craton
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New integrated geochemical studies are reported for Jurassic granites of the Xingcheng area in the northeastern North China Craton. U–Pb zircon data indicate that the Huashan and Taili monzogranites were emplaced during the Early (189 ± 2 Ma) and Late (155 ± 1 Ma) Jurassic, respectively. They are typical of high-K calc-alkaline series rocks and I-type granites, according to our whole-rock geochemical researches. Both Early and Late Jurassic monzogranites show adakitic rock characteristics because of their high Sr contents (221–347 ppm) and Sr/Y ratios (28.7–37.5), and low Y contents (7.83–14.7 ppm). The Early Jurassic monzogranite samples have an (87Sr/86Sr)i ratio of 0.7046, εNd(t) values of −11.62 to −11.51, and εHf(t) values of −13.6 to −6.4, whereas the Late Jurassic monzogranites have higher (87Sr/86Sr)i ratios of 0.7069–0.7071 and lower εNd(t) (−20.65 to −20.46) and εHf(t) (−27.6 to −20.0) values. We suggest that the Early Jurassic adakitic rocks were derived from partial melting of thickened lower crust contaminated with mantle-derived materials, related to subduction of the Paleo-Pacific Plate. The Late Jurassic adakitic rocks were derived from partial melting of thickened lower crust in an extensional tectonic setting associated with an active continental margin.
geochemistrypetrologymonzograniteadakiteNorth China Craton
MU Maosong、YANG Debin、XU Wenliang、QUAN Yikang、HAO Leran、YANG Haotian、WANG Anqi
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College of Earth Sciences,Jilin University,Changchun 130061,China
Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Natural Resources,Changchun 130061,China
国家自然科学基金国家自然科学基金Basic Scientific Research Foundation of Central Universities of China
国家科技期刊平台
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