关于造山带花岗岩类填图方法的讨论——以西秦岭天水地区为例

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结构特征的复杂性、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、真实地反映造山带花岗岩类的特色。

Discussion on geological mapping of granitoids in orogenic belt:A example from Tianshui region in the western Qinling orogenic belt

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.