北票市广富营子—带金矿构造地质特征及成矿作用

GEOLOGY TECTONIC CHARACTERISTICS AND MINERALIZATION OF GOLD DEPOSITS IN GUANGFUYINGZI OF BEIPIAO

研究区位于凌源-北票断裂带NE向末端,本地区古生代尤其中生代构造活动剧烈。地表主要出露NE、NNE和NW向三组断裂,并沿着三组断裂充填了多期次中酸性脉岩。金成矿作用明显呈现出受断裂构造控制、跟脉岩相关的特点。研究区节理产状数据分析表明,区内遭受过NW-SE、NNW-SSE和NEE-SWW方位的构造应力作用,产生3组断裂构造系统。区内金矿床的勘查及研究表明,其成矿作用可能具有多期次。含硫化合物及金矿化热液有叠加成矿,后期被断裂和岩脉分割破碎的特点。沿NE和SW向两端可能存在豆荚状盲矿体,NW向矿体深部可能存在较好的隐伏矿体。

The study area of this paper lies to the northeastem end of the Lingyuan-Beipiao NE trend fault zone. Paleozoic especially Mesozoic intensive tectonic activity and frequent magmatic hydrothermalism created advantageous geological conditions for remobilization and enrichment of gold. This area includes three surface active fault belts. They are NE. NNE and NW trending. Mainly vein rock intermediate and acidic dykes which are closely related to the trend of the three groups of faults were formed during the mineralization period. The data analysis of joint attitudes shows this area experienced NW-SE. NNW-SSE ~D NEE-SWW tectonic stress action and appeared three groups of fracture systems. Exploration and study indicates the gold deposits in this area may have the characteristics of multi-stage mineralization. Sulfur compounds and gold-bearing thermal flows have obvious characteristics of superimposed gold mineralization and segmented by faults and veins. Podiform chromite blind orebodies may exist to the both ends of NE gold orebodies or may lie under the NW orebodies.