华北陆块东南缘蚌埠地区花岗岩与相关脉岩40Ar-39Ar定年

基金项目: 科技部2000年度科技基础性工作第35专项、国土资源部专项（2000010403）和中国地质调查局地质大调查项目（200113000052-2、200413000024）资助。

40Ar-39Ar dating of granites and related dikes in the Bengbu area on the southeastern margin of the North China block

1.
Anhui Institute of Geological Survey, Hefei 230001, Anhui, China
2.
Hefei University of Technology, Hefei 230009, Anhui, China
3.
Geological Survey and Environmental Monitoring Center of Anhui Province, Hefei 230001，Anhui, China

摘要: 提要：本文运用40Ar-39Ar定年技术，对蚌埠地区花岗岩及相关脉岩的形成年龄进行了精确的测定。结果表明，华北陆块东南缘不仅存在有前寒武纪岩浆活动，还广泛发育有中生代岩浆岩。根据所获年龄资料，笔者首次将区内中生代岩浆活动划分为燕山早、晚2期5个阶段，初步构建出该区晚中生代岩浆作用年代格架。
- 晚中生代 /
- 花岗岩类 /
- 40Ar-39Ar同位素年龄 /
- 蚌埠
Abstract: Abstract：Granites and related dikes in the Bengbu area have been dated precisely by using the 40Ar-39Ar dating technique. The results indicate that there occurred Precambrian magmatism but also Mesozoic magmatism on the southeastern margin of the North China Ｂlock in the Bengbu area. According to the age data available, the Mesozoic magmatism in the area is divided into the early Yanshanian and late Yanshanian phases and five stages. A chronological framework of Late Mesozoic magmatism has been preliminarily established.
- Late Mesozoic /
- Ｇranitoids /
- 40Ar-39Ar dating /
- Bengbu