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40Ar/39Ar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。
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.
作者
孙东霞
吕同艳
沈晓丽
薛蕾
SUN Dongxia;Lü Tongyan;SHEN Xiaoli;XUE Lei(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;Earthquake Administration of Fujian Province,Xiamen 361021,Fujian,China)
出处
《地质通报》
CAS
CSCD
北大核心
2019年第9期1511-1520,共10页
Geological Bulletin of China
基金
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)
