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前言拉拉铜矿是西南地区重要的铜矿区之一。拉拉——石龙地区的铜、铁矿床,大体皆赋存于元古界会理群河口组富钠质的变质火山岩之中。这套火山岩由于钠长石化和区域变质作用及后期蚀变,使原岩面貌改观较大,甚至面目全非,致使人们对这套岩石的认识带来了困难,因而对其原岩产生了数种看法。由于对岩石的成因有不同看法,也就引起对其矿床成因有不同的认识,从而影响到普查勘探工作。因此岩石成因归属是一个重要课题。为着解决该地区变钠质火山岩的分类命名,原岩恢复,我所原铁矿队岩石组于76年6月——11月,与403队有关同志共同在该地区进行野外工作。在前人工作的基础上,笔者根据其野外观察及室内对800余薄片的镜下研究和小组其他同志测试数据写成此
Foreword Lala copper mine is one of the important copper mining areas in Southwest China. Copper deposits and iron deposits in the Lala-Shilong area generally occur in the Na-rich metamorphic volcanic rocks in the Hekou Formation of the Proterozoic Huili Group. Due to the albite and regional metamorphism and later alteration, this volcanic rock made the appearance of the original rock changed greatly, even beyond recognition, which made it difficult for people to know the rock and made several opinions about the rock. . Due to different opinions on the origin of rocks, different understandings of the origin of their deposits have been caused, thus affecting the census and exploration work. Therefore, the cause of rock attribution is an important issue. In order to solve the classification denoting the sodium-bearing volcanic rocks in the area, the original rock was restored. The rock group of the original iron mine team conducted field work in the area with comrades from the 403 team in June-November 2006. Based on the work of predecessors, the author based on his field observation and indoor microscopy of more than 800 sheets and other gay team test data to write this