摘要
花岗岩类的分类理论决定其填图方法。现行的单元 -超单元填图方法是依据花岗岩类的 I型、S型分类理论和同源岩浆演化理论而建立的。由于同源岩浆演化理论的不完善性 ,造山带地壳结构及地质构造特征的复杂性、地质作用过程的多样性 ,导致了形成花岗岩类源岩组分的复杂性 ,使得 I型、S型分类在造山带具有不确定性 ,因而单元 -超单元填图方法在造山带实践中存在较多问题和矛盾。造山带花岗岩类填图方法应以基本岩石分类方案为依据 ,以野外可识别、易掌握的客观岩石学、矿物学、组构学为准则 ,客观。
The unit and super-unit mapping of granitoids is based on classification of I-type and S-type as well as magmatic evolution theory. Owing to the imperfection in the comagmatic evolution theory and complication of crustal composition and structural evolution process, granitoids in orogenic belts are usually derived from different source rocks, resulting in uncertainty of the I-type and S-type classification of granitoids. Therefore, the unit and super-unit mapping of granitoids is limited in practice especially in regional geological mapping of orogenic belts. We hold that mapping of granitoids should be based on the basic classification of rocks and their petrological, mineralogical as well as fabric features, reflecting the characteristic of the granites objectively and really in orogenic belts.
出处
《华南地质与矿产》
CAS
2003年第1期1-6,共6页
Geology and Mineral Resources of South China
基金
中国地质调查局地质调查项目 ( 2 0 0 0 13 0 0 0 10 171
关键词
花岗岩类
填图方法
造山带
西秦岭
granitoid
geological mapping method
orogenic belt
western Qinling
