华北地台北缘花岗岩—绿岩型金矿田及盲矿体的找矿模型

THE ORE-SEARCH MODELS OF GRANITE-GREENSTENE-TYPE GOLD OREFIELD AND BLIND OREBODY AT NORTHERN MARGIN OF NORTHERN CHINA PLATFORM

花岗岩—绿岩型金矿田的找矿模型地质上是富镁铁质绿岩、韧性剪切带与重熔岩体的三体一位;物探上位于航磁高背景场的负磁异常带边缘,矿田晕分散流异常规模大、强度高,有明显的浓集中心。隐伏矿床、盲矿体的找矿模型地质上是韧性剪切带、退变质带及脆性断裂带的三体一位;物探上呈现高极化率、低电阻、位于磁异常边缘的“一高一低一边”模型;化探原生晕上呈现As、sb、F、Ag、Bi、W的找矿模型。

The ore - search model of granite - greenstone type gold orefield is in geology of trinity of Fe, Mg-rich greenstone, ductile shear zone and anatectic rock body. From the view of geophysical prospecting, the indicators included the margin of zonal negative magnetic anomaly on the basic of high aeromagnetic feature, the large scale and high intensity of dispersion flow anomaly and its obrious Centralized center of orefield halo. The ore - search models of buried and blind orebody are in geology the trinity of ductile shear ,retrograde metamorphic and brittle faulted zones ,in geophysical prospecting the margin of high induced ,low resistant magnetic anomaly (margin-high -low ),and in chemical prospecting the existing of primary halo of As ,Sb,F,Ag ,Bi,W.