U-Pb chronology, geochemical characteristics and petrogenesis of the Chelugou pluton in the western part of North Qilian orogenic belt
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摘要:
车路沟岩体位于北祁连造山带最西端，岩石类型以英云闪长玢岩和闪长玢岩为主。本次对英云闪长玢岩进行U-Pb年代学研究，获得加权平均年龄为（462.1±3.8）Ma，表明岩体形成于中奥陶世。岩石地球化学分析结果显示，英云闪长玢岩中SiO2含量60.37%~66.73%，Al2O3含量15.65%~16.45%，Na2O/K2O值7.47~9.96，A/CNK为0.90~1.00，属中酸性岩系列，显示相对富钠、低钾的特征，A/CNK=0.90~1.00，属于准铝质低钾钙碱性系列；稀土总量较低（33.40×10-6~39.27×10-6），LREE/HREE值为3.95~6.51，在稀土元素配分图解上呈现出右倾特征；δEu值1.23~1.49之间，呈现Eu呈正异常特征；在微量元素原始地幔标准化图解上，显示富集Ba、Sr，亏损Nb、Ti、Yb高场强元素的特征。对车路沟岩体地质、地球化学特征与产出背景的全面分析，认为其为奥陶纪祁连洋持续向华北板块俯冲，诱使俯冲洋壳部分熔融形成的埃达克岩。
Abstract:Located at the westernmost end of the North Qilian orogenic belt, the Chelugou pluton consists predominantly of quartz diorite porphyry and diorite porphyry. Zircon LA-ICP-MS U-Pb dating of the Chelugou quartz diorite porphyry yielded an age of (462.1±3.8) Ma. Rocks from the Chelugou pluton show intermediate-felsic, metaluminous and low calc-alkaline features, with relatively low SiO2 (61.44%-67.63%), Al2O3 (15.09%-16.7%) and A/CNK values (0.90-1.00), and high Na2O/K2O ratios (7.47-9.96). They have relatively low rare earth element content (33.40×10-6-39.27×10-6) and are characterized by positive Eu anomaly and high LREE/HREE ratios (3.95-6.51), similar to features of typical adakites. All of the rocks are also enriched in Ba, Sr and depleted in HFSEs (e.g., Nb, Ti and Yb). By comprehensively synthesizing geochemical compositions and geological setting for magma rocks within the study area, the authors hold that the Chelugou granitoids were derived from partial melting of subducted oceanic plate related to the northward subduction of the Qilian Ocean underneath the North China Block in Ordovician.
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Key words:
- Chelugou pluton /
- zircon U-Pb /
- subduction of oceanic crust /
- Qilian Mountain orogenic belt /
- adakite
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表 1 车路沟岩体主量元素（%）、微量元素（10-6）分析结果
Table 1. Analytical results of major elements (%) and trace elements (10-6) of the Chelugou rock mass
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表 2 车路沟岩体中LA ICP-MS锆石U-Pb同位素测年结果
Table 2. Zircon LA ICP-MS U-Pb isotopic data of the Chelugou pluton
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