一、花岗岩类的侵入时代 伴随着滇西多旋迴地质构造运动,花岗岩类侵入活动亦十分频繁。就成因而论,既有强烈的花岗岩化作用,又有广泛的酸性岩侵入活动,后者在空间上互相迭加、穿插,构成复式侵入体。目前查明,这些花岗岩类分属于4个侵入旋迴(加里东早期旋迴、加里东晚期旋迴、印支-燕山早期旋迴、燕山晚期旋迴)、6个侵入期及15个侵入阶段(表1)。 分布于G-R变质带中心的混合花岗岩,系加里东早期花岗岩化作用的产物。这一 First, the invasive age of granitoids accompanied by multi-cycle geological tectonic movement in western Yunnan, granite intrusions are also very frequent. On the origin of the reason, both a strong role of granitization, there are a wide range of acidic rock intrusion activities, the latter in space with each other Diego, interspersed, constitute a complex intrusive body. It has been found that these granitoids belong to 4 intrusive cycles (early Caledonian, late Caledonian, Indosinian-Yanshanian early cycle, late Yanshanian cycle), 6 intrusions and 15 intrusions (Table 1). The mixed granites distributed in the center of the G-R metamorphic belt are the products of early Caledonian granitization. This one