摘要
结合野外实际资料,笔者就花岗岩类谱系单位填图方法能否以岩石结构演化特征为基础建立S型花岗岩的谱系单位,深成岩体间的接触关系类型能否作为划分花岗岩等级体制的标志进行了分析讨论,认为不同深成岩体之间的固结作用时间差仅仅是影响岩石结构变化及深成岩体间接触关系类型的因素之一,更主要的影响因素是与深成岩体形成时的物理化学环境(温度、压力、挥发组分的多寡)以及围岩介质的湿冷度、岩浆上侵规模的大小等有关。因此,S型花岗岩序列内部从早单元到晚单元岩石结构可以出现由粗粒结构→细粒结构演化的现象,同一超单元内部也可以出现超动型接触关系。另外,文中还对与火山岩关系密切的高位深成岩体能否单独建立谱系单位及混合岩浆成因的花岗岩可否利用同源岩浆演化理论建立谱系单位等问题进行了探讨。认为该方法尚有不妥之处,在具体使用过程中应加以注意。
According to the information from the field work, the author discussed the quastions about setting up granitoid lineage mapping unit and regarding contact relationship between the deep intrusives as signs of distinguishing the granite grade in this paper.The author suggests that the concretion time difference between the different deep intrusives is only one of the factors of the rock structure and contact relationship. The more impotant effecting factors are the intrusives forming physic and chemical conditions(such as temperature,pressure,volatilizations and so on),the granite humidity and the intruding scale as well. Therefor, inside the S-type granite,we can see the rock changes from coarse to fine granular texture from early to late unit,and in the same superunit,the beveling contact relationship can be seen, too. The author thinks there still some questions in this mapping mathod.
出处
《地质调查与研究》
2003年第1期61-64,共4页
Geological Survey and Research
