Petrogenesis and Tectonic Implications of Jurassic Granites in the Xingcheng Area, Northeastern North China Craton,Acta Geologica Sinica-English Edition

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Petrogenesis and Tectonic Implications of Jurassic Granites in the Xingcheng Area, Northeastern North China Craton
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-03-30 , DOI: 10.1111/1755-6724.14698
Maosong MU ₁ , Debin YANG _{1,

2,

3} , Wenliang XU ₁ , Yikang QUAN ₁ , Leran HAO ₁ , Haotian YANG ₁ , Anqi WANG ₁

Affiliation

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, ∊_Nd(t) values of –11.62 to –11.51, and ∊_Hf(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 ∊_Nd(t) (–20.65 to –20.46) and ∊_Hf(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.

中文翻译：

华北克拉通东北部兴城地区侏罗纪花岗岩的成因及构造意义

对华北克拉通东北部兴城地区侏罗纪花岗岩进行了新的综合地球化学研究。U-Pb锆石数据表明华山和太里二长花岗岩分别在早（189±2 Ma）和晚（155±1 Ma）侏罗世就位。根据我们的全岩地球化学研究，它们是典型的高钾钙碱性系列岩石和I型花岗岩。早侏罗世和晚侏罗世二长花岗岩由于其 Sr 含量高 (221-347 ppm) 和 Sr/Y 比值 (28.7-37.5) 和 Y 含量低 (7.83-14.7 ppm) 都显示出埃达克岩特征。早侏罗世二长花岗岩样品的 ( ⁸⁷ Sr/ ⁸⁶ Sr) _i比值为 0.7046，∊ _Nd ( t的-11.62）值至-11.51，和ε_的Hf（吨的-13.6至-6.4）值，而晚侏罗纪monzogranites具有较高（⁸⁷ SR / ⁸⁶ SR）_我的0.7069-0.7071比和降低ε_钕（吨） (–20.65 到 –20.46) 和∊ _Hf ( t)（–27.6 到 –20.0）值。我们认为早侏罗世埃达克质岩石是由受地幔衍生物质污染的加厚下地壳的部分熔融形成的，与古太平洋板块的俯冲有关。晚侏罗世埃达克质岩石来自于与活动大陆边缘相关的伸展构造环境中加厚的下地壳的部分熔融。

更新日期：2021-03-30

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