马鞍桥金矿床地质-地球化学特征及成因探讨

GEOLOGICAL-GEOCHEMICAL CHARACTERISTICS AND GENESIS OF MA'ANQIAO GOLD DEPOSIT

马鞍桥金矿床具有明显的层控特点,矿化范围大、形态较规则、工业矿体分布较局限,矿石品位较低,金矿床受区域性大断裂一侧的脆-韧性剪切带控制,金矿化产于剪切带中较低序次脆性破裂面中,深部含矿热流体主要是同生水、大气降水和少量岩浆水,多数金属硫化物的形成具有多期性,而金的成矿主要为一期,二者不具明显的相关关系。马鞍桥金矿为受脆-韧性剪切带控制的微细浸染型金矿,成因上属于多来源地下热水渗滤型金矿。

Ma＇anqiao gold deposit is characteristic of stratabound,large area mineralization,regular ore bodies and low grade.The deposit is controlled by brittle-ductile shear zone in one side of a deep regional fault.Gold mineralization occurs at the low order brittle fractural plane in the shear zone.The deep heat ore fluid is composed of cognate water,meteoroid water, and a small amount of magmatic water.Sulfides are formed in multiple stages but gold is mainly deposited in one stage showing no obvious correlation.It is a brittle-ductile shear zone-controlled infiltrated micro-disseminated gold ore deposit with multiple sources of fluid.