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一、前言四川会理拉拉地区大小铜铁矿点近二十个,这些铜、铁矿的产出均与元古界会理群河口组中的“变钢质火山岩”有关。这套“变钠质火山岩”与其他正常变质沉积岩和一些侵入体,脉岩等均遭到长期不同程度的构造变动及变质作用,加之铜、铁矿化,钠化以及各种期后热液蚀变作用,造成本区复杂的地质景观。在二十多年的时间内,到过拉拉地区的中外专家,对本区变钠质岩石的成因以及
I. INTRODUCTION Nearly twenty copper and iron ore mined in the Lally area of Huili in Sichuan Province are related to the “variable-quality volcanic rocks” in the Hekou Formation of the Paleozoic Rift. The “altered sodium volcanic rocks” and other normal metamorphic sedimentary rocks and some intrusions, veins and other rocks have been subject to varying degrees of structural alteration and metamorphism over a long period of time, combined with copper, iron mineralization, sodiumification, and various post-hydrothermal fluids Alteration effect, resulting in the complex geological landscape in this area. In more than 20 years, Chinese and foreign experts who have been to the Lara region have studied the causes of the alteration of sodium-bearing rocks in the area and