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一、地质概况古永花岗岩是腾冲钖矿带的重要含钖岩体。岩体侵入于石炭系勐洪群中,接触带具角岩、夕卡岩化,南北长100公里,南部分为两支,分别于新歧花岗班岩(γπ~8)两侧展布。根据野外观察和室内岩石、岩石化学资料,古永岩体主体可划分为三个岩相带: 1.斑状黑云二长花岗岩分布在岩体西部,出露面积大占岩体出露面积的70％以上。具肉红色钾长石粗大斑晶,短柱状,最长可达5公分,宽2.5公分。岩石的矿石组分有:钾长石25—40％,斜长石20—45％,石英30—35％,黑云母5％±;付矿物以磁铁矿、屑石、锆石
First, the geological overview Ancient Yong granite is Tengchong 钖 ore belt containing important rock mass. The intrusive rocks intruded into the Menghong Group in the Carboniferous. There were horn-horn rocks and skarnizations in contact with the rocks. They were 100 km long from the north to the south, and divided into two in the south. They were distributed on both sides of the new granite gangue (γπ ~ 8) . According to field observations and laboratory rock and petrochemical data, the main body of the Guiyong pluton can be divided into three lithofacies: 1. Porphyritic biotite monzogranite is distributed in the western part of the rock mass, accounting for a large area of 70 %the above. With flesh pink feldspar coarse macular, short column, the longest up to 5 cm, 2.5 cm wide. Rock ore components are: potassium feldspar 25-40%, plagioclase 20-45%, quartz 30-35%, biotite 5% ±; to pay minerals to magnetite, crumb, zircon