摘要
通过对南平—宁化构造岩浆带西段长汀张地地区楼前组典型剖面的研究,查明楼前组为一套火山岩-火山碎屑沉积岩组合,且火山活动由早到晚呈现由强至弱、由中酸性向酸性演化的变化规律。通过区域对比研究后发现受南平—宁化构造带所控制的楼前组火山活动具明显的不均一性。应用LA-ICP-MS锆石U-Pb法对楼前组火山岩进行同位素测年,获得了(732.1±7.4)Ma的岩浆锆石年龄,证实了楼前组的形成时代为南华纪。
Through the study of the Louqian formation typical section of the structure in Changting county zhangdi area of the the western section of the Nanping-Ninghua tectonic magmatic zone, the author found out that the front group rock is a set of volcanic rocks -- volcanic clastic sedimentary rocks. The volcanic activity changes from strong to weak, from middle to acidic. Thoungh the study of regional comparative, it is found that the volcanic activity of the Louqian group controlled by the Nanping-Ninghua tectonic belt is obviously heterogene- ous. LA-ICP-MS zircon U-Pb method was applied to the isotopic dating of the volcanic rocks of the Louqian group, and the magmatic zircon age （732. 1± 7.4 Ma） was obtained. It is proved that the formation time of the Louqian group is Nanhua period.
作者
黄家龙
Huang Jialong(Fuj ian Geological Survey Research Institute, Fuzhou , 350013)
出处
《福建地质》
2017年第3期159-169,共11页
Geology of Fujian
基金
中国地质调查局大调查项目"福建1:5万长汀县等四幅区域地质调查"研究成果
项目编码(12120113071000)
