广东省高要区大坪坑金矿区糜棱岩分带特征浅析

Analysis of the Characteristics of Mylonite Zoning in Dapingkeng Gold Mine Area,Gaoyao District,Guangdong Province

广东省高要区大坪坑金矿是位于粤西河台韧性剪切金成矿带中的金矿之一。矿区糜棱岩带发育,但对其分带特征及其与成矿的关系研究较少,通过对矿区糜棱岩带的岩石特征及其含矿性进行研究,发现矿区糜棱岩带呈现出数量多、分布广、规模大以及多期构造叠加的特点,规模较大的糜棱岩带中可见明显分带,自韧性剪切带边缘向中心,构造变形增强,依次呈现出糜棱岩化岩石、初糜棱岩、糜棱岩、超糜棱岩的分带特征,但由于后期韧性剪切作用的叠加,糜棱岩带中局部出现跨带分布的特征,在叠加构造且富集硫化物处金含量增高,富集形成金矿体。

The Dapingkeng gold deposit in Gaoyao District,Guangdong Province is one of the gold deposits located in the Hetai ductile shear gold metallogenic belt in western Guangdong.The mylonite belt in the mining area is developed,but there are few studies on its zoning characteristics and the relationship between its zoning characteristics with mineralization.The rock characteristics and ore-bearing properties of each belt are studied through field outcrop observation of the mylonite belt in the mining area.It is found that the mylonite belt in the mining area is large in numbers and scale,widely distributed and has multi-stage structural superposition.In the mylonite belt that is larger in scale,obvious zoning can be seen from the edge to the center of the ductile shear zone.There is a enhancement in structural deformation and the zoning characteristics of mylonitized rocks,primary mylonites,mylonites,and ultra-mylonites are shown in turn.However,due to the superposition of late ductile shearing,the mylonite belts have the characteristics of cross-zonal distribution locally.In superimposed structures and sulfide-enriched places,the gold content increases,and gold ore bodies are formed by enrichment.