| 福州盆地西缘霏细斑岩脉锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 林木森,吴凌啸,王翠芝.福州盆地西缘霏细斑岩脉锆石U-Pb年龄及其地质意义[J].地质通报,2019,38(10):1726-1732. |
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| 作者姓名： | 林木森 吴凌啸 王翠芝 |
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| 作者单位： | 福州大学紫金矿业学院, 福建 福州 350108,福州大学紫金矿业学院, 福建 福州 350108,福州大学紫金矿业学院, 福建 福州 350108 |
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| 基金项目： | 福建省自然科学基金项目《福建沿海晚中生代地球动力学机制——以琅岐岛中-基性岩墙群为例》（编号：2018J01472）和福州大学第25期本科生科研训练计划项目《福州盆地西缘溪源宫周边岩浆岩组合特征及地质意义》（编号：25273） |
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| 摘 要： | 通过对福州盆地西北缘发育的霏细斑岩脉野外地质特征、锆石U-Pb测年及地球化学研究,讨论其与福州复式花岗岩体的成因联系。研究区霏细斑岩呈紫灰色,局部可见明显的流动构造,主要由正长石斑晶组成,脉体呈北东向侵入于早期福州复式岩体中。研究结果显示,霏细斑岩脉形成于97.4Ma,具有钙碱性Ⅰ型花岗岩的特征。该期岩浆活动形成于福州复式岩体的过渡期,且其地球化学特征与早白垩世钙碱性Ⅰ型花岗岩、晚白垩世碱性A型花岗岩之间存在连续过渡的关系,反映其为福建东南沿海构造体制从弧后扩张向陆内伸展转换的产物,暗示该构造体制的转换时间约为97Ma。
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| 关 键 词： | 霏细斑岩 锆石U-Pb年龄 晚白垩世 福州盆地西缘 地质意义 |
| 收稿时间： | 2017/12/10 0:00:00 |
| 修稿时间： | 2018/4/9 0:00:00 |
Zircon U-Pb age of the felsite porphyry veins in western Fuzhou basin of Fujian Province and its geological significance |
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| LIN Musen,WU Lingxiao and WANG Cuizhi.Zircon U-Pb age of the felsite porphyry veins in western Fuzhou basin of Fujian Province and its geological significance[J].Geologcal Bulletin OF China,2019,38(10):1726-1732. |
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| Authors: | LIN Musen WU Lingxiao and WANG Cuizhi |
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| Affiliation: | Zijin College of Mining, Fuzhou University, Fuzhou 350108, Fujian, China,Zijin College of Mining, Fuzhou University, Fuzhou 350108, Fujian, China and Zijin College of Mining, Fuzhou University, Fuzhou 350108, Fujian, China |
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| Abstract: | This paper presents U-Pb zircon geochronology, petrology, and major and trace elements of Cretaceous felsite porphyry veins in western Fuzhou basin, Fujian Province. These data were used to investigate the genetic relationship between felsite porphyry and Fuzhou composite granite body. Felsite porphyry shows purplish gray color and is mainly composed of orthoclase phenocrysts, and the well-developed flow structure is present on the margin. Felsite porphyry veins have a NE-trending strike and intruded into Fuzhou composite granite body. Felsite porphyry shows the features of calc-alkali and I-type granites, with the emplacement age being 97.4Ma; it was formed in the transition period between early Fuzhou composite granite body (111~100Ma) and late Fuzhou composite granite body (95~90Ma). The geochemical characteristics between the above three phase rock types present a graduallychanged transitional relation on the time scale. That is, this felsite porphyry is the product of the tectonic regimes conversion between Early and Late Cretaceous in southeastern China. The authors thus hold that the transformation age may be 97Ma. |
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| Keywords: | felsite porphyry zircon U-Pb age Late Cretaceous western Fuzhou basin geological significance |
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