| 长江中下游繁昌盆地火山岩年代学和地球化学:岩石成因和地质意义 |
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| 引用本文： | 刘春,闫峻,宋传中,李全忠,彭戈,史磊,刘晓强.长江中下游繁昌盆地火山岩年代学和地球化学:岩石成因和地质意义[J].岩石学报,2012,28(10):3228-3240. |
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| 作者姓名： | 刘春 闫峻 宋传中 李全忠 彭戈 史磊 刘晓强 |
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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;安徽省公益性地质调查管理中心,合肥230001
2. 合肥工业大学资源与环境工程学院,合肥,230009 |
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| 基金项目： | 本文受国家自然科学基金项目(40972052)和安徽省公益性地质研究项目(2008-g-5)联合资助 |
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| 摘 要： | 长江中下游地区发育多个中生代火山盆地,自西向东依次为金牛、怀宁、庐枞、繁昌、宁芜、溧水和溧阳盆地.繁昌盆地自下而上发育中分村组、赤沙组和蝌蚪山组火山岩.中分村组下段和上段流纹岩的LA-ICPMS锆石U-Pb定年结果分别为131.2±1.1Ma和129.1±1.3Ma,和蝌蚪山组流纹岩的形成时代(130.7±1.1Ma)在误差范围内一致,表明繁昌盆地火山岩喷发持续时间较短.中分村组发育英安岩和流纹岩,赤沙组以粗安岩为主,并有少量的流纹岩,两者的SiO2含量分别为64.36％ ～75.45％和63.08％ ～69.75％.中分村组和赤沙组火山岩的稀土和微量元素特征基本一致,均富集轻稀土和大离子亲石元素,亏损Nd、P和Ti,其中,流纹岩表现为Eu的负异常.中分村组样品的87Sr/86 Sr(t)为0.7060 ～ 0.7074,εNd(t)为-7.91～ -8.11,赤沙组样品的87Sr/86Sr(t)为0.7073,εNd(t)为-6.62～ -6.71,和蝌蚪山组玄武岩的Sr-Nd同位素组成很相似.综合分析表明,中分村组火山岩为岩石圈地幔部分熔融的岩浆底侵形成的下地壳再次部分熔融的产物,并经过辉石、角闪石、斜长石和磷灰石的结晶分异.赤沙组粗安岩为岩石圈地幔部分熔融形成的玄武岩浆,经过橄榄石、辉石、斜长石和钛铁氧化物结晶分异形成.岩石圈地幔的部分熔融在长江中下游地区中生代火山岩中表现的最为集中,表明～ 130Ma时期为本地区的拉张峰期.
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| 关 键 词： | 火山岩 锆石定年 地球化学 中生代 繁昌 长江中下游 |
| 收稿时间： | 2012/5/25 0:00:00 |
| 修稿时间： | 2012/8/25 0:00:00 |
Geochronology and geochemistry of the volcanic rocks from Fanchang basin in the Middle-Lower Yangtze River: Petrogenesis and geological significance |
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| LIU Chun,YAN Jun,SONG ChuanZhong,LI QuanZhong,PENG Ge,SHI Lei and LIU XiaoQiang.Geochronology and geochemistry of the volcanic rocks from Fanchang basin in the Middle-Lower Yangtze River: Petrogenesis and geological significance[J].Acta Petrologica Sinica,2012,28(10):3228-3240. |
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| Authors: | LIU Chun YAN Jun SONG ChuanZhong LI QuanZhong PENG Ge SHI Lei and LIU XiaoQiang |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Public Geological Survey Management Center of Anhui Province, Hefei 230001, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | |
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| Keywords: | Volcanic rock Zircon dating Geochemistry Mesozoic Fanchang The Middle-Lower Yangtze River |
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