汞矿带中金矿成矿条件及赋存规律

The Forming Condition and Existing Regularity of Au Mineralization in Hg-ore Belt

本文根据我国汞(锑)矿带中已发现的数十个金矿床(点)的勘查研发成果,从成矿系列、载金矿物、金的赋存状态、矿化围岩、成矿热液、成矿温度、控矿层位、控矿沉积相、控矿构造及成矿时代等十个方面,较全面地论述了汞(锑)矿带中金矿的成矿规律。其中,有些是其他类型金矿也具有的;而有些则是汞(锑)矿带中金矿所特有的。这些共有的和特有的成矿规律,对探索不同类型金矿的成因或成矿机制、成矿模式,或将有所助益。

According to the data of tens of Au deposits and spots,author has sumed up the ore-forming condition and existing regularity of Au mineralization in Hg ore belt as fallows; 1. Au in Hg ore belts together with.Hg,Sb,As consists of a low temperature ore-forming sequence ; 2. The Au - bearing minerals are mainly arsenopyrite and arsenomarcasite riched in sulphur ; 3. Au exists in form of isomoph and super-microscopic grains; (<0. lu)and a little is contained in organic matter and clay minerals in absorption state ,with rare independent Au mine rals including natural Au,electrum,Hg-bearing natural Au and goldamalgam occasionally 5 4. The mineralized host rocks are all clayey,silty and muddy rocks; 5. The ore - earring fluid derived from sealed thermal brine rather than magma water or down -osmotic meteoric water; 6. The ore -forming temperature is low,not exceeding 200C for Au,150C for Hg ,As,and Sb; 7. The stratabound feature is distinct; 8. Au mineralization is controlled by cartain sedimentary facies,such as slope facies,basin facies and reef facies; 9. Anticlines are the major controlling structure; 10. The mineralization age is late,about from Late Mesozoic to Tertiary