华北陆块东南缘蚌埠地区花岗岩与相关脉岩40Ar-39Ar定年

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

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。

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.