伽马能谱测量在侵入体岩石谱系单位填图中的应用

THE APPLECATION OF THE GAMMA SPECTROMETRYIN THE MAPPING OF HIERARCHICAL UNITS OF INTRUSIONS

在１∶５万区域地质填图中，可利用γ能谱测量仪在现场测定各类侵入岩的Ｕ、Ｔｈ、Ｋ含量，Ｕ／Ｔｈ、Ｋ／Ｔｈ、Ｕ／Ｋ比值和γ照射量率等参数。通过对地面γ能谱测量资料与区域地质特征的综合分析，将攀枝花地区侵入体划分为１９个单元、６个超单元及一个超单元组合。还确认了色腰和矮郎河花岗岩为印支期，花滩花岗岩和同德闪长岩均为太古代古陆核的组成部分。

In the 1∶50 000 regional geological mapping, the gamma spectrometer has been used to determine on the spot the U,Th and K contents,U/Th,K/Th and U/K ratios and gamma irradiation rate of various types of intrusions.By means of an intergrated analysis of ground spectrometric data and regional geological features,the intrusions in the Panzhihua area are divided into 19 units,6 superunits and one superunit group.Besides,the authors consider the Seyao granite and Ailanghe granite to be of Indosinian age and the Huatan granite and the Tongde diorite to be the Archean products, both of which are component parts of a paleocontinental nucleus.