摘要
澜沧江断裂中段(永平—云龙)出露一条变质岩带,矿物成分主要为石英、黑云母和白云母。岩石化学成分表明该变质岩属于铝硅酸盐类,元素地球化学特征表明,该变质岩系的原岩主要为沉积岩,但可能有火山凝灰物质加入,从而表明该变质岩带的南北两端出露的火山岩带在该区段内是不连续的。因此,在该区开展找矿时重点应注意与沉积变质作用有关的类型矿床。
A metamorphic belt is exposed in the central segment (Yongping -Y unlong)of the Lancangjiang fault.The major minerals of the metamorphic rock s in the belt are quartz,biotite and muscovite.The petrochemical composition s uggests that the metamorphic rocks are aluminosilicates and the element geo-ch emistry suggests that the protolith of this metamorphic series is chiefly sedim entary rocks but is likely to be introduced by volcanic tuffaceous material.T his indicates that the volcanic belt exposed at the northern and southern ends o f this metamorphic belt is discontinuous in this segment of the area.Theref ore,atten-tion should be paid to looking for metamorphosed sedimentary minera l deposits when carrying out mineral exploration in the area.
出处
《中国地质》
CAS
CSCD
2002年第3期297-300,共4页
Geology in China
基金
国家科技攻关项目(96-914-02-04)
