摘要
为确定丽水南明山一带碧湖—吴弄口盆地与丽水盆地的接触关系,对该地区白垩纪盆地开展了区域调查,在进行了区域填图、剖面测制、ESR及LA-ICP-MS锆石U-Pb测年等基础上,分析了该地区地质背景和砂砾岩成因;认为南明山一带砂砾岩为碧湖—吴弄口盆地消亡时冲积扇相产物,归为永康群顶部方岩组;角砾凝灰岩归为丽水盆地天台群底部塘上组,时限为95±1Ma。两者存在上下叠覆的角度不整合关系。
In order to determine the Cretaceous stratigraphic correlation between the Bihu-Wunongkou Basin and the Lishui Basin in the Nanming mountains in Zhejiang Province,geological mapping has been conducted in this area.On the basis of geological mapping,measured stratigraphic sections,ESR,and LAICP-MS zircon U-Pb dating,the origin of Cretaceous conglomerates in the Nanming mountains have been analyzed.Conglomerates in the Bihu-Wunongkou Basin are interpreted as alluvial fan deposits during late stage of basin formation and are assigned to the Fangyan Formation of the Yongkang Group.Tuffaceous breccias with zircon U-Pb age of 95±1Ma are classified as the upper Tangshang Formation of the Tiantai Group.The contact between these two groups is represented by an angular unconformity.
出处
《地层学杂志》
CSCD
北大核心
2014年第3期305-310,共6页
Journal of Stratigraphy
基金
中国地质调查局浙江1/5万双溪等四幅区调项目(1212010011601)资助
