黑龙江老柞山金矿田南东段矿床成因

The genesis of the southeast section of the Laozhashan gold ore field, Heilongjiang

老柞山金矿田由几个与侵入岩有关的热液型金矿床组成,矿体多为脉状,多赋存在古元古界兴东群大马河组夕卡岩层内,主要为夕卡岩型浸染状金矿石,次为角砾岩型浸染状。分早晚2期成矿:早期为元古宙混合岩化热液,基本特点为富As亏S,高温,形成混合岩化热液型金矿体;晚期为燕山期再生岩浆热液叠加在早期矿体之上,使早期矿体变富。NE向断裂控制金矿床,NW及NWW向断裂及韧性剪切带控制金矿体。矿床成因为后期热液叠加的混合岩化交代夕卡岩型金矿床。

Several intrusive rock relative hydrothermal solution type gold deposits compose the Laozhashan gold ore field. The ore bodies are mainly veins and occurred in the skarn of Paleo-Proterozoic Xingdong Group Damahe Formation. The type of the ores are mainly skarn disseminated gold ore, secondly are breccia disseminated. The mineralization could be parted into two stages: the early stage is migmatized hydrothermal solution of Proterozoic that rich As and short S in high temperature come into being migmatized hydrothermal solution type gold body. The late stage one is the regenerated magma hydrothermal of Yanshan period superimposed on the early ore body and enriched the early one. NE strike fault controlled the gold deposit and NW and NWW strike faults and ductile shear zone controlled the gold ore body. The genesis of the gold deposit is late hydrothermal superimposed migmatization replace skarn type gold deposit.