临沧地区富铀花岗岩体地球化学特征及其地质意义

田建民, 徐争启, 尹明辉, 李涛, 孙康

Geochemical characteristics and geological significance of uranium-rich granites in Lincang area

TIAN Jian-Min, XU Zheng-Qi, YIN Ming-Hui, LI Tao, SUN Kang

图2 临沧花岗岩岩石学特征 a—似斑状黑云母二长花岗岩,含有多条石英脉;b—中细粒花岗岩体内发育不规则状暗色包体;c—似斑状黑云二长花岗岩内发育自形五边形石英晶体;d—自形石英颗粒,赤铁矿化严重;e—钾长石被石英包围,聚片双晶发育;f—钾长石卡式双晶,部分钾长石发生高岭土化,斜长石绢云母化;其中e、f为正交偏光图像;Q—石英;Kf—钾长石;Pl—斜长石;Bi—黑云母

Fig.2 Petrological characteristics of Lincang granite a—porphyritic biotitemonzonite granite, containing multiple quartz veins; b—irregularly dark inclusions in medium-fine-grained granite; c—self-formed pentagonal quartz crystals in motley granite; d—self-shaped quartz particles, hematite is seriously mineralized; e—potassium feldspar is surrounded by quartz, and polycrystalline twin crystals develop; f—potassium feldspar card-type twin crystal, part of the potassium feldspar is kaolinized, plagioclase sericite;e and f are cross-polarized images;Q—quartz; Kf—potassium feldspar; Pl—plagioclase; Bi—biotite