摘要
云南祖母绿矿产出于南温河变质核杂岩的变质内核之中，形成于白垩纪花岗岩岩浆活动晚期的残余岩浆和热液产生的伟晶作用和交代作用。其赋矿构造为：①北东向张剪裂隙（已被伟晶岩脉充填）；②次级韧性剪切滑脱带。前者矿体中的祖母绿产量高，晶型好，但颜色稍差；后者矿体中的祖母绿质量最好，但产量不高，宝石晶体中常含有电气石、白钨矿等固体包裹体和大量流体包裹体。其形成时的温度为３２５～３７２°Ｃ，盐度ｗ（ＮａＣｌ）为１３％～１８％，压力为６６．７～７７．９ＭＰａ，矿区外围仍有很好的祖母绿找矿远景。
The Yunnan emerald occurs in Nanwenhe metamorphic core complex.So far,it is the only emerald deposit found in China.It was the production of the pegmatitization and replacement of residual magma and hydrothermal in Late Cretaceous.It has two kinds of ore bearing structure,one is the vein of pegmatite and the other is the ductile shear belt.The emerald in the former is richer in quantity and the crystal form is better,but the colour is a bit lighter.The emerald in the latter is better in quality,but the production is lower.The emerald crystal often contains some solid and fluid inclusion,such as tourmaline,scheelite,H 2O,CO 2 etc..The content of V 2O 5 in mineral is 0.775% and the Cr 2O 3 is 0.4% from EPTA & CCA.The formation temperature of the emerald deposit is 325￣372°C,the salinity w (NaCl) is 13%￣18% and the pressure is about 66.7￣77.9 MPa.The geological and geochemical information shows that this area has a very good prospect of exploring high grade emerald.
出处
《地质科技情报》
CAS
CSCD
北大核心
1999年第1期50-54,共5页
Geological Science and Technology Information
基金
地矿部1:5万都龙幅区调项目
