桂北地区金矿成矿规律与找矿预测

元古宙火山－陆源碎屑沉积含金建造与下古生界含碳碎屑沉积建造是该区金矿主要赋矿层中，前者为陆内裂陷沟－弧环境产物，后者形成了陆缘盆地构造环境。金矿化总体呈东西向延展又依ＮＮＥ～ＮＥ向成带的分布格局，是受古东西向基底隐伏构造带和ＮＮＥ～ＮＥ向深断裂双重制约的结果，继承元古宙裂陷槽俯冲带发展演化形成的韧性剪切带，控制与基性，超基性杂岩有关的金矿化，次级隆起动缘构造挤压带是金成矿的有利部位，金矿化主要受脆

METALLOGENIC REGULARITY AND PROSPECTING PROGNOSIS OF GOLD DEPOSIT IN NORTH GUANGXI

Proterozoic gold-bearing volcanic - terrigenous detrital sedimentary formation andLower Palaeozoic gold-bearing carbonaceous detrital sedimentary formation are main gold-bearing strata in North Guangxi. The former is formed in trench - arc environment ofintracontinental rift, and the latter in marginal basin. Gold mineralization is characterizd byEW tetallogenic zone, which is composed of a series of NNE -NE secondary metallogeniczones, The metallogenic pattern is controlled by both EW hidden tectonic zone of basementand NNE - NE deep fractures. Ductile shear zones, which are developed by proterozoicsubduction of rift, control gold minerallization related to basic - ultra basic complex. Insecondary uplift margin, tectonic compressional zone, in which gold mineralization is mainlycontrolled by brittle shear zones,is advantageous to gold mineralization. Metallogenic epoch,which is Xuefeng period in West part, and caledonian period in East part, is consistent withprogressive tectonic evolution from West to East. Remelting crust type granitoids. whichoccur as large and multistage intrusions, are not characterized by metallogenic specializationto gold, but have space-time relations with gold mineralization, because these intrusionspromote gold activation and migration in thermal environment. In summary, the prospectingprognosis prospect of gold in North Guangxi is potentially optimistic' and the prospectingprognosis and guide are significant to exploring gold deposit in North Guangxi-