花岗岩类中钾长石巨晶成因研究进展

The Origin of K-feldspar Megacryst in Granitoids:A Critical Review

本文回顾了钾长石巨晶成因认识的发展历程:梳理了钾长石巨晶的各种地质特征,讨论了认识过程中存在的若干争论,特别是两种针锋相对的模型;指出钾长石在成核生长过程中经历了一个复杂的物理化学过程,包括物质和能量的交换,强调在这个反复的过程中,外部热源(基性端员或新侵位的岩浆)、结晶潜热和差应力对流等所供给的热源可使钾长石的近于固相线附近维持较长的时间。最后指出了研究中存在的问题以及未来研究方向。

This paper reviewed understanding developing of the origin of k-feldspar megacryst in granitoids.The geological features of megacryst were summarized,several controversies were discussed,especially,the two contrasting models.The authors claimed that nucleation and growth of k-feldspar were complicated,including repeating exchanges of mass and energy.The authors emphasized that contribution of external heat source（mafic end-member or a new magma pulse）,latent heat and stress-induced convection result a prolonged crystallization history of k-feldspar megacryst.In the end,some scientific problems and future research directions were summarized.