| 皖南逍遥岩体的年代学、地球化学特征及其成因分析 |
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| 引用本文： | 施珂,张达玉,丁宁,王德恩,陈雪锋.皖南逍遥岩体的年代学、地球化学特征及其成因分析[J].吉林大学学报(地球科学版),2017(6):1746-1762. |
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| 作者姓名： | 施珂 张达玉 丁宁 王德恩 陈雪锋 |
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| 作者单位： | 1. 合肥工业大学资源与环境工程学院,合肥230009;安徽省地质调查院,合肥230001;2. 合肥工业大学资源与环境工程学院,合肥,230009;3. 安徽省地质调查院,合肥,230001;4. 安徽省地质矿产勘查局332地质队,安徽黄山,245000 |
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| 基金项目： | 国家自然科学基金项目，中国地质调查局地质调查项目，安徽省国土资源科技项目，Supported by National Natural Science Foundation of China，Geological Survey Project of China Geological Survey，Land and Resources Science and Technology Projects of Anhui Province |
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| 摘 要： | 皖南绩溪县逍遥岩体侵位于新元古界南华系、震旦系和下古生界海相沉积盖层中,岩性为花岗闪长岩。测得该岩体LA-ICP-MS锆石U-Pb同位素加权平均值年龄为(149.3±2.3)和(148.6±1.9)Ma,表明:岩体侵位于晚侏罗世。逍遥花岗闪长岩体的电子探针分析显示其黑云母为镁质黑云母。岩石地球化学研究表明:其为高钾钙碱性系列,准铝质—过铝质,属于I型花岗岩;微量元素特征显示其富集轻稀土而亏损重稀土元素,富集Ba、Sr等大离子亲石元素。综合地质、年代学、电子探针和岩石主微量元素分析,逍遥岩体形成于晚侏罗世,其岩浆来源于有幔源物质加入的下地壳,在形成过程中经历了较强的部分熔融作用,该岩体具有火山弧花岗岩特点。
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| 关 键 词： | 年代学 地球化学 电子探针 逍遥岩体 皖南地区 |
Geochronology,Geochemistry and Formation of Xiaoyao Rock in Southern Anhui Province |
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| Abstract: | The Xiaoyao granodiorite pluton intruded into Neoproterozoic Paleozoic marine sedimentary strata in Jixi County,south Anhui Province.The LA-ICP-MS zircon U-Pb isotopic data yield weighted mean ages of (149.3±2.3) and (148.6±1.9) Ma,indicating the magma was emplaced in Late Jurassic.After an electron microprobe (EPMA) analysis,the composition of representative silicate from Xiaoyao granodiorite intrusion shows that the biotite is Mg-biotite.The whole-rock chemical compositions suggest that Xiaoyao granodiorite intrusion is of Ⅰ-type,belonging to high-kalium calcium alkaline series granitoid,and the characters of the trace elements show that the rocks are enriched in LREE,and depleted of HREE,indicating the lower crust sourced magma with some mantle materials added,which experienced strong fractional crystallization during its evolution.The Xiaoyao intrusion granodiorite pluton is characterized by that of volcanic-arc granite (VAG). |
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| Keywords: | Geochronology geochemistry EMPA Xiaoyao granodiorite pluton south Anhui Province |
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