摘要
东坡矿田是我国重要的稀有-有色金属矿田之一。本文概述矿田矿化的特征,着重研究矿田构造与成岩、成矿作用的关系;认为北东向断裂构造最为重要。次为近南北向断裂构造。矿田内的岩浆岩分三期五次侵入就位,前二期花岗岩是同源岩浆不同深度的产物、不同期次的花岗岩。分别与不同类型的矿床有关,从而构成特有的构造-岩浆-成矿系列。
Dongpo ore feild is characterized by association of many genetic types of ore deposits, many periods and stages of mineralization. Assemblages of many ore-forming elements, zonal distribution of ore deposits are around the granite.
The granite, in ore field, is a composite instrusion body. It consists of fine-grained porphyritic biotite granite (γ_5^(2-1)) ,medium to coarse-grained biotite granite (γ_5^(2-2)) , fine-grained biotite alkali-feldspar granite (γ_5^(2-3))and granite porphyry (γ_π). The evolution course of magma from γ_π through γ_5^(2-1) to γ_5^(2-2) up to γ_5^(2-3), shows obviously differentiationary trends. But for instrusive sequence, γ_π is the last one. Therefore,it is thought that γ_5^(2-1) ,γ_5^(2-2),yγ_5^(2-3) and γ_π are related to different source area of comagma. Judging from the occurrence of granites, γ_π probably came from a level deeper than the others in origin.
The structure in ore field had moved frequently. It has controlled the occurrences of granites and various types of ore bodies. The tectono-mag-matic activity has formed two tectono-magmatic-metallogenesis serises.
出处
《矿物岩石》
CAS
CSCD
1989年第4期40-48,共9页
Mineralogy and Petrology
