摘要
薄竹山花岗岩体是一个复式岩体。1989年～1994年间，笔者在进行1：5万老寨街幅和老街子幅区域地质调查时应用岩石语系单位划分方法将其分解为23个侵入体，建立了7个单元，归并为2个序列和一个独立单元。岩石特征及地球化学特征均显示各单元属于“S”型花岗岩，形成时期在白垩纪～老第三纪之间，从早期到晚期岩石结构由一期结构向具有二期结构和微花岗结构演化，成分由偏基性向偏酸性、碱性方向演化。
The Baozhu Mountain granite body is a complex rock body. In 1989- 1994. we divided it into 23 intrusiv bodies, set up 7 units, and reduced to 2 successions and 1 independent unit by the method of litho-spectral unit classification in the 1: 50,000 regional geological sur-veying of Laozhaijie and Laojiezi sheets. Both petrological and geochemical features show all units belong to the 'S' type granite. formed from Cretaceous to Palaeogene. From the earli-er stage to the later one, the rocks evolved in structure from the first stage structure to the second stage structure and then the microgranite structure, and acidic, alkalic components increased.
出处
《云南地质》
1997年第3期222-231,共10页
Yunnan Geology
