青城子矿田高家堡子大型金银矿床地质特征及成矿机制

高家堡子金银矿床赋存于辽东裂谷辽河群大石桥组大理岩与盖县组变粒岩互层过渡带中,容矿岩石主要为变粒岩、大理岩和硅质岩。矿床分布严格受推覆构造及其剪切作用形成的北东向剪切构造与层间剥离构造控制。成矿物质来源具有多源性,以深成火山喷流流体为主,岩浆热液流体叠加混合形成成矿热液。因此,高家堡子金银矿床成矿过程中地层岩性是成矿的基础,韧性剪切构造作用是条件,岩浆热液 (硅化 )是成矿关键。据此可以认为高家堡子矿床具有火山喷流－韧性剪切－岩浆热液叠加的成矿模式。

GEOLOGICAL CHARACTERISTICS AND METALLOGENICMECHANISMOFGAOJIAPUZILARGE-SCALEAu-Ag DEPOSITSINQINGCHENGZIOREFIELD

Gaojiapuzi Au-Ag deposits occurre in the transitional belt of interbedded marble of Dashiqiao F. and leptite of Gaixian F.,which host rocks mainly are leptite,marble and wollastonite. Their distribution are strongly controlled by nappe structure,NE-trending shearing structure and interstratal delaminating structure.Ore-forming material are polygene,mainly hypogene volcanic spoutting fluid.Magmatic hydrothermal fluids superimposed,mixed and formed into metallogenic hydrothermal.So,for Gaojiapuzi Au-Ag deposits,metallogenic process and lithologic character are metallogenic base;ductile shearing structures are metallogenic candition;magmatic hydrothermal(silicification) is the key of metallogenesis.It is considerded that Gaojiapuzi Au-Ag deposits are of volcanic spoutting-ductile shearing-magmatic hydrothermal overimposing-type deposits.