论文部分内容阅读
环斑花岗岩在北半球有着广泛的分布 ,构成一条近东西向巨型花岗岩带 ,在我国华北地台的北缘密云附近也有出露。环斑花岗岩是由Sederholm (1891)命名的一类花岗质岩石 ,其特征是具有环斑结构。一百多年来 ,几经研究 ,环斑花岗岩的定义和内涵也在不断补充和完善 ,特别是经过IGCP315项目的系统总结 ,对环斑花岗岩的含义、时代、岩石共生组合、形成的构造环境和物理化学条件有了更深入的认识。IGCP4 2 6项目实际上是IGCP315项目的扩展和延伸 ,环斑花岗岩仍然是其主要研究内容。本文是笔者参加芬兰花岗岩考察的部分内容总结 ,主要介绍环斑花岗岩的定义、岩石学 -地球化学特征和形成的物理化学环境。
Ringed granite in the northern hemisphere has a wide distribution, forming a near east-west giant granite belt, in northern China on the north edge of Miyun also revealed. Ringed granite is a type of granitic rock named by Sederholm (1891), which is characterized by a ring-spotted structure. After more than one hundred years, the definition and connotation of ringed granite have been constantly replenished and improved after several years of research. In particular, through the systematic summary of IGCP315 project, the author elaborated on the meaning of ringed granite, the age, the symbiotic assemblage of rock, the tectonic environment formed Physical and chemical conditions have a deeper understanding. The IGCP4 2 6 project is actually an extension and extension of the IGCP 315 project, with ring-shaped granites still the main focus of its research. This article is part of the author’s summary of Finnish granite survey. It mainly introduces the definition of ringed granite, petrology-geochemistry characteristics and the formation of the physical and chemical environment.