| 闽北地区中侏罗世火山岩的发现及其地质意义 |
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| 引用本文： | 李亚楠,邢光福,邢新龙,陈世忠,段 政,杨 东,胡凌云.闽北地区中侏罗世火山岩的发现及其地质意义[J].地质通报,2015,34(12):2227-2235. |
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| 作者姓名： | 李亚楠 邢光福 邢新龙 陈世忠 段 政 杨 东 胡凌云 |
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| 作者单位： | 1.中国地质调查局南京地质调查中心，江苏 南京 210016；
2.北方工程设计研究院有限公司，河北 石家庄 050011；
3.成都理工大学地球科学学院，四川 成都 610059；
4.中国地质科学院，北京 100037 |
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| 基金项目： | 中国地质调查局项目（编号: 1212011120882） |
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| 摘 要： | 中侏罗世火山岩在东南沿海分布极少,但对区域中生代构造-岩浆活动过程及大地构造演化的研究具有重要意义。在闽北地区大面积白垩纪火山岩区调查中,在政和铁山地区发现中侏罗世火山岩,用LA-ICP-MS同位素测试技术测得的锆石U-Pb年龄为173.63±0.80Ma。火山岩属钙碱性系列流纹质熔结凝灰岩,显示过铝质、富钾、富集大离子亲石元素,亏损高场强元素等地球化学特征,推断其形成于陆缘弧环境,与古太平洋板块早期俯冲作用有关。
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| 关 键 词： | 中侏罗世 火山岩 闽北地区 LA-ICP-MS锆石U-Pb测年 |
The discovery of Middle Jurassic volcanic rocks in northern Fujian Province and its geological significance |
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| LI Ya''nan,XING Guangfu,XING Xinlong,CHEN Shizhong,DUAN Zheng,YANG Dong,HU Lingyun.The discovery of Middle Jurassic volcanic rocks in northern Fujian Province and its geological significance[J].Geologcal Bulletin OF China,2015,34(12):2227-2235. |
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| Authors: | LI Ya'nan XING Guangfu XING Xinlong CHEN Shizhong DUAN Zheng YANG Dong HU Lingyun |
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| Institution: | 1. Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China;
2. Northern Engineering Design and Research International Co., Ltd., Shijiazhuang 050011, Hebei, China;
3. Institute of Geosciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
4. Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | There are only very few Middle Jurassic volcanic rocks exposed along the southeast coast of China, but they are very important for the study of the regional Mesozoic tectonic magmatic activiy and tectonic evolution. The authors discovered for the first time the Middle Jurassic volcanic rocks in the Tieshan area of Zhenghe during the survey of large area of Cretaceous volcanic rocks in northern Fujian Province. The zircon U-Pb age obtained by LA-ICP-MS technique is 173.63±0.80Ma. The volcanic rocks are welded tuff, belonging to the calc-alkaline series. Geochemical data show that they are peraluminous rocks rich in potassium and large ion lithophile elements but poor in high field strength elements. Therefore, these rocks must have been formed in a continental margin arc environment, related to the subduction of the paleo-Pacific plate. |
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| Keywords: | Middle Jurassic volcanic rock northern Fujian Province LA-ICP-MS zircon U-Pb dating |
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