吉林和龙地区主要金属矿床成矿地质特征及找矿方向

Metallogenic Geological Characteristics and Prospecting Potential of Main Metal Deposits in Helong Area,Jilin

和龙地区是吉林省重要的多金属勘查区,近年来发现了众多铁、钼、金、银矿床(点),显示出该区良好的找矿潜力。根据目前已发现矿床(点)的地质特征和形成时代,划分出6类主要矿床类型。认为该区多金属成矿具有集中性、长期性、阶段性等特性,多金属成矿作用受地层、侵入岩和构造的联合控制。该区矿产勘查主攻矿种应以铁、钼为主,兼顾构造蚀变岩型石英脉型金、银矿;主攻矿床类型为太古代沉积变质铁矿、石英脉型破碎蚀变岩型金矿、斑岩型钼矿;主要找矿手段为地质填图+地质岩石剖面+槽探+物探(激电)+钻探。区内找矿应重点围绕已发现矿床的攻深找盲基础上,沿古洞河北北西向断裂及其次级断裂、不同岩性接触面进行区域性的追索找矿,尤其应注意东西向断裂构造与北东及北西向断裂构造交汇部位、强硅化蚀变岩或石英脉出露部位、二长花岗岩或花岗闪长斑岩或花岗斑岩侵入地段或多金属异常发育地段的勘查工作。

Helong area is an important polymetallic exploration area in Jilin province,and the discov-ery of many iron,molybdenum,gold and silver deposits (points)in recent years shows its good prospec-ting potential.According to the geological characteristics and the formation age of the discovered deposit (points),deposit types are divided into six categories.The polymetallic metallogenic ore has the charac-teristics of concentration, protracted nature and stage;the function of polymetallic metallogenic ore is jointly controlled by stratum,intrusive rocks and magmatic rocks;the main attack minerals are iron and molybdenum,covering structural altered rock type and quartz vein type gold,silver deposits;the main attack deposit types are archean sedimentary-metamorphic iron deposit, quartz vein type and clastic-al-tered-rock type gold deposit, porphyry molybdenum deposit;the main deposit methods are geological mapping,geological rock section,trenching,geophysical prospecting (induced electrical)and drilling. Based on looking for deep and hidden mines,the prospecting should be explored regionally along the NW fault and secondary fault,different lithological contact surface of the northern Huifa River.Especially, the exploration work should pay attention to the intersection part of EW fault structure and NE and NW fault structure,strong silicified altered rocks or quartz veins outcropping site,invasion section of adamel-lite or granodiorite porphyry or granite-porphyry,ploymetallic abnormal development section,etc.