| 胶东艾山岩体二长花岗岩地球化学、锆石U-Pb年代学及Lu-Hf同位素特征研究 |
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| 引用本文： | 李秀章,王立功,李衣鑫,王英鹏,于晓卫,张文,郭瑞朋,刘汉栋.胶东艾山岩体二长花岗岩地球化学、锆石U-Pb年代学及Lu-Hf同位素特征研究[J].现代地质,2022,36(1):333-346. |
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| 作者姓名： | 李秀章 王立功 李衣鑫 王英鹏 于晓卫 张文 郭瑞朋 刘汉栋 |
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| 作者单位： | 1. 山东省地质调查院,山东 济南 2500132. 桂林理工大学 地球科学学院,广西 桂林 541006 |
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| 基金项目： | 国家重点研发计划项目“深部资源预测系统技术研究与示范”(2017YFC0601506)；;山东省自然科学基金面上项目(ZR2020MD033)； |
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| 摘 要： | 胶东地区大规模金成矿作用发生于125～110 Ma,与金成矿作用同期的早白垩世晚期艾山岩体出露于华北克拉通东缘,由深成相的石英闪长岩-似斑状二长花岗岩类及浅成相的闪长玢岩、花岗斑岩等组成,岩体发育岩浆暗色包体.对艾山二长花岗岩开展了岩相学、岩石地球化学、锆石LA-ICP-MS年代学和Lu-Hf同位素测试和研究,探讨了该...
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| 关 键 词： | 艾山岩体 二长花岗岩 锆石U-Pb年龄 Lu-Hf同位素 胶东 |
| 收稿时间： | 2021-03-31 |
| 修稿时间： | 2021-09-03 |
Geochemistry,Zircon U-Pb Chronology and Lu-Hf Isotope Characteristics of Monzogranites from Aishan Pluton in Jiaodong Peninsula |
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| LI Xiuzhang,WANG Ligong,LI Yixin,WANG Yingpeng,YU Xiaowei,ZHANG Wen,GUO Ruipeng,LIU Handong.Geochemistry,Zircon U-Pb Chronology and Lu-Hf Isotope Characteristics of Monzogranites from Aishan Pluton in Jiaodong Peninsula[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(1):333-346. |
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| Authors: | LI Xiuzhang WANG Ligong LI Yixin WANG Yingpeng YU Xiaowei ZHANG Wen GUO Ruipeng LIU Handong |
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| Institution: | 1. Shandong Institute of Geological Survey, Jinan, Shandong 250013, China2. College of Earth Sciences, Guilin University of Technology, Guilin, Guangxi 541006, China |
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| Abstract: | The large-scale gold mineralization in Jiaodong Peninsula occurred from 125 to 110 Ma. Early Cretaceous Aishan pluton, coincided with the gold mineralization, is distributed in the eastern margin of North China Craton. Aishan pluton is composed of deep-facies quartz diorite-porphyry monzonitic granite and shallow-facies diorite porphyry, granite porphyry, etc., and develops mafic enclaves. Based on the studies of the petrography, geochemistry, zircon LA-ICP-MS U-Pb dating and Lu-Hf isotopic constitution of Aishan monzogranites, this paper discusses the petrologic classification, forming age, magmatic source and petrogenesis. Zircon U-Pb age of Aishan pluton is( 115±1)Ma. Aishan pluton is characterized by Na2O>3.47, A/CNK<1.35, high Y content (8.2×10-6-210.5×10-6), low Sr/Y ratio (19.5-67.3), with obvious rare earth element fractionation (LREE/HREE=28.43-34.72, (La/Yb)N=46.38-56.74), and negative Eu anomaly (δEu=0.75-0.83). Aishan pluton is a set of quasi-aluminous-weak peraluminous high-potassium calc-alkaline rock series, showing the characteristics of I-type granite. Aishan monzogranites have zircon εHf(t) values of -19.7 to -16.0, and two-stage Hf model ages (TDM2) vary in range of 2.18-2.42 Ga. According to the petrology, geochemistry and Lu-Hf isotopic constitution, combined with the results of previous studies on the genesis of Weideshan granite, the authors hold that Aishan monzogranites are a production of mixture between crustal acid magma and mantle intermediate-basic magma. The magma mainly derived from ancient Proterozoic and Neoarchean continental crust material. |
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| Keywords: | Aishan pluton monzogranite zircon U-Pb age Lu-Hf isotope Jiaodong Peninsula |
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