| 赣中山庄二长花岗岩的成因与构造背景:岩石学、地球化学及锆石U-Pb年代学证据 |
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| 引用本文： | 张建岭,许德如,于得水,王智琳,叶挺威,于亮亮,朱昱桦.赣中山庄二长花岗岩的成因与构造背景:岩石学、地球化学及锆石U-Pb年代学证据[J].岩石学报,2018,34(6):1641-1656. |
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| 作者姓名： | 张建岭 许德如 于得水 王智琳 叶挺威 于亮亮 朱昱桦 |
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| 作者单位： | 中国科学院广州地球化学研究所矿物学与成矿学重点实验室;中国科学院大学;东华理工大学地球科学学院;中南大学地球科学与信息物理学院 |
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| 基金项目： | 本文受国家自然科学基金项目（41472171）和国家重点研发计划项目（2016YFC0600401）联合资助. |
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| 摘 要： | 赣中山庄花岗岩岩体位于钦杭成矿带的南侧,岩性上包括二长花岗岩和花岗闪长岩。本文对岩体北部的二长花岗岩开展了年代学、地球化学及同位素研究以约束该岩体的形成时代、岩石成因及成岩构造背景。锆石CL图像、Th/U比值,以及(Sm/La)_N-La和Ce/Ce~*-(Sm/La)_N图解均表明,二长花岗岩所有锆石晶体为岩浆成因;其中第一组锆石加权平均年龄为420～419Ma,代表了岩浆结晶年龄。该花岗岩SiO_2含量为71.48%～66.20%、K_2O/Na_2O值为1.24～0.99、A/CNK1.1;结合白云母和石榴石的出现、ACF图解、Rb-Th、Rb-Y的负相关性,山庄二长花岗岩属高钾钙碱性强过铝质S型花岗岩。同时,该岩石亏损大离子亲石元素Ba和Sr以及高场强元素Nb和Ta,说明系壳源物质部分熔融的产物。CaO/Na_2O值(0.14～0.07)、Rb/Sr值(8.27～3.83)、Rb/Ba值(1.48～0.82)、FeO~T+MgO+TiO_2含量(2.4～1.8)和二阶段Nd模式年龄(t_(2DM)=2031～1971Ma)进一步说明二长花岗岩的源岩是古元古代的富粘土的泥质岩。锆石的饱和温度和Ti温度计计算结果表明二长花岗岩岩浆形成温度为722～720℃,黑云母的全铝温度计则反映其形成压力为3.21～2.71kbar。结合花岗岩构造环境判别图以及华南大地构造演化特征,山庄花岗岩岩体可能是在后碰撞环境下由古元古代富粘土泥质岩于低温低压条件下部分融熔的结果。
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| 关 键 词： | 山庄花岗岩 锆石U-Pb年龄 地球化学和Sr-Nd同位素 后碰撞 江西中部 |
| 收稿时间： | 2017/5/19 0:00:00 |
| 修稿时间： | 2018/5/19 0:00:00 |
Petrogenesis and tectonic setting of the Shanzhuang monzogranites in central Jiangxi Province, South China: Evidence from lithology, geochemistry and zircon U-Pb geochronology |
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| ZHANG JianLing,XU DeRu,YU DeShui,WANG ZhiLin,YE TingWei,YU LiangLiang and ZHU YuHua.Petrogenesis and tectonic setting of the Shanzhuang monzogranites in central Jiangxi Province, South China: Evidence from lithology, geochemistry and zircon U-Pb geochronology[J].Acta Petrologica Sinica,2018,34(6):1641-1656. |
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| Authors: | ZHANG JianLing XU DeRu YU DeShui WANG ZhiLin YE TingWei YU LiangLiang and ZHU YuHua |
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| Institution: | Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China,Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;School of Earth Sciences, East China University of Technology, Nanchang 330013, China,Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China,School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China,Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China and Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | |
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| Keywords: | Shanzhuang granitic pluton Zircon LA-ICP-MS U-Pb dating Geochemistry and Sr-Nd isotopes Post-collision Central Jiangxi Province of South China |
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