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临沧岩体和平和街岩体是两个出露于滇西澜沧江带的海西-印支时期花岗岩类岩基,主要岩性为斑状(似斑状)黑云母二长花岗岩、花岗闪长岩.在这些花岗岩中,作者发现有很少报道的自然铅副矿物存在,其平均含量20g/t,最高含量可达36g/t,它们可能是在后期的变质热事件过程中形成的,X粉晶衍射分析表明,其表面有一层氧化膜(密陀僧PbO),它对于自然铅的保存起着重要作用.
The Lincang pluton Hepinghejie rock mass is two Hercynian-Indosinian granite-type rock bases exposed in the Lancang River belt of western Yunnan. The main lithology is plagioclase-like biotite monzogranite, granodiorite Among these granites, the authors found that there are few reported reports of natural lead-related minerals, with an average content of 20 g / t and a maximum of 36 g / t, probably formed during the later metamorphic thermal events. X Powder diffraction analysis shows that there is a layer of oxide film on the surface (Mantou Senate PbO), which plays an important role in the preservation of natural lead.