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作者对城岗变质杂岩矿物进行了初步研究。提供了有关角闪石、黑云母、石榴石和斜长石的化学成份变化特点及其与变质作用的关系。用多种方法计算了结晶温度和压力。根据对黑云母—石榴石和斜长石—角闪石共生矿物对的测温以及用角闪石 AL~(TV)对 Si 变异图来区分压力.求得结晶度为570一620℃,压力为4.5—5.5千巴,该变质体的埋藏深度约17—20(km),相应的地热梯度为22—30℃/km 因此确认该变质体的变质矿物是在角闪岩相条件下形成的。
The authors conducted a preliminary study of the Chenggang metamorphic complex minerals. Provides the characteristics of the chemical composition of amphibole, biotite, garnet and plagioclase and their relationship with metamorphism. Crystallization temperature and pressure were calculated in various ways. Based on the temperature measurements of the biotite-garnet and plagioclase-amphibole co-occurring mineral pairs and the pressure difference between amphibole AL-TV and Si, the crystallinity was determined to be 570-620 ° C and the pressure was 4.5-5.5 kPa. This metamorphic body has a burial depth of about 17-20 km and a corresponding geothermal gradient of 22-30 ° C / km, thus confirming that metamorphic minerals of this metamorphic body were formed under amphibolite facies conditions.