| 福建龙海—漳浦沿海地区火山岩激光~(40)Ar/~(39)Ar年龄 |
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| 引用本文： | 孙东霞,吕同艳,沈晓丽,薛蕾.福建龙海—漳浦沿海地区火山岩激光~(40)Ar/~(39)Ar年龄[J].地质通报,2019,38(9):1511-1520. |
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| 作者姓名： | 孙东霞 吕同艳 沈晓丽 薛蕾 |
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| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081;活动构造与地壳稳定性评价重点实验室, 北京 100081,中国地质科学院地质力学研究所, 北京 100081;活动构造与地壳稳定性评价重点实验室, 北京 100081,山东科技大学地球科学与工程学院, 山东 青岛 266590,厦门地震勘测研究中心, 福建 厦门 361021 |
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| 基金项目： | 中国地质调查局项目《海南岛及近海活动断裂与地壳稳定性调查评价》（编号：DD20190306）和《泛珠三角地区活动构造与区域地壳稳定性调查》（编号：DD20160269）、国家自然科学基金项目《黄土级石英从源区到沉积区的释光灵敏度特征及其地质意义》（批准号：41877443）、中国地质科学院基本科研业务费项目《部新构造运动与地质灾害重点实验室-年代测试中心建设》（编号：JYYWF20183201）、中国地质科学院地质力学研究所基本科研业务费项目《福建东南沿海第四纪以来的新构造及年代学研究》（编号：DZLXJK201301） |
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| 摘 要： | 福建东南沿海龙海—漳浦地区是新生代佛昙群玄武岩的分布区之一。对该区域火山岩而言,前人的研究主要集中在岩石地球化学特征、形成演化方面,对年代学研究较少,玄武岩喷发期次划分仍以20世纪80、90年代测定的K-Ar结果为依据,或通过下覆地层孢粉组合时代推断而来。为了更精确地测定该地区火山作用的时代及进一步确定其喷发期次,选取龙海—漳浦地区4个玄武岩样品,利用激光~(40)Ar/~(39)Ar测年方法进行精细定年。样品年龄为10.1～14.8Ma,明确了龙海-漳浦新生代玄武岩在中新世中晚期存在一次喷发期次。
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| 关 键 词： | 40Ar/39Ar年龄 火山岩 佛昙群 龙海—漳浦地区 |
| 收稿时间： | 2019/1/10 0:00:00 |
| 修稿时间： | 2019/5/5 0:00:00 |
High-precision laser 40Ar/39Ar age of volcanic rocks in Longhai-Zhangpu area, Fujian Province |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Key Laboratory of Active Tectonics and Crustal Stability Assessment, Beijing 100081, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Key Laboratory of Active Tectonics and Crustal Stability Assessment, Beijing 100081, China,College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China and Earthquake Administration of Fujian Province, Xiamen 361021, Fujian, China |
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| Abstract: | Cenozoic volcanic rock is wildly distributed in Longhai-Zhangpu area in the southeast of Fujian Province. The basalts are part of Fotan Group. Previous research was mainly focused on the geochemical characteristics, the formation, and the evolution of the volcanic rock in this area. However, the study of geochronology of these rocks remains very insufficient. The eruption periods of basalt is still based on the K-Ar dating conducted in the 1980s and 1990s, or inferred from the ages of the pollen assemblage features of plants in the underlying strata. In order to obtain high quality data, the authors applied the laser 40Ar/39Ar dating method to four samples of volcanic rocks taken from Longhai-Zhangpu area. The results indicate that there was an eruption of Longhai-Zhangpu volcanoes around 10.1~14.8Ma. In other words, the time interval was in the Middle-Late period of the Miocene. |
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| Keywords: | 40Ar/39Ar age volcanic rocks Fotan Group Longhai-Zhangpu area |
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