信阳地区龟山岩组变质岩的原岩恢复

摘要

Guishan Group is a (tectonic) complex unit or tectonic strata unit, with a strong deformation of mesometamorphic rocks as the main body, consists of the tectonic block in several different age through multiperiods tectonic mixture effects stacked together. According to the assemblage characteristics and the regional geological background of Guishan Group metamorphic rocks in Xinyang, this paper selects four petrochemical diagrams, from the basic distinction between orthometamorphite and para-metamorphic rock, to the graphic analysis of amphibolitic metamorphic rocks and felsic rocks respectively, through the progressive and comprehensive comparison, and then discusses the protolith restoration of GuiShan group metamorphic rocks.%龟山岩组是以强变形中深变质岩为主体的（构造）杂岩单位或构造岩层单位，由多个不同时代构造岩块经过多期构造混杂作用堆垛叠置在一起形成。根据信阳地区龟山岩组的变质岩组合特征及区域地质背景，选取四类岩石化学图解，从基本的区分正负变质岩到对角闪质岩石及长英质岩石分别进行图解分析，通过渐进和综合的比较，认为龟山岩组一岩段原岩可能主要为泥砂质碎屑岩；二岩段可能主要为一套泥砂质碎屑岩夹双峰式火山岩。