摘要
本文通过古应力估算、流体包体研究、应变测量以及矿化蚀变规律研究，探讨了山东文登金矿的动力作用与金成矿的主要关系。认为构造动力作用是金成矿的主要原因。
Structural dynamic action is one of the main factors responsible for the adjustment of material structure and components.The intensity of structural activity directly affects the extent of material migration.The ore forming process of the Wendong gold deposit is related to the deformation and evolution of the NS trending Mishan fault,which underwent multiperiod activities dominated by ductile deformation at early stage and brittle deformation at late stage.Such variation of deformation mechanism constituted indispensable prerequisite for the formation of the gold deposit.A comparative study of calculated paleostress and strain measurements with gold grade shows that paleostress and strain intensity are in direct correlation with gold grade.Gold grade is usually higher where deformation intensity is relatively high,suggesting the existence of close correlation between material migration and tectonic movement.Fluid inclusion studies indicate that the main ore forming process occurred during the transition from the ductile deformation to the brittle deformation.Ductile deformation mainly gave birth to auriferous metamorphic fluids.At the late stage,large quantities of brittle fissures were formed,boiling and cryptoexplosion of fluids took place,and closed system turned into open system,which broke the original equilibrium and caused the migraiton of original auriferous metamorphic fluids and their eventual precipitation in favorable space.Spatial distribution of orebodies reveals the negative correlation between orebody thickness and gold grade,which reflects multiperiod activities of faults and multiple ore forming processes.
出处
《矿床地质》
CAS
CSCD
北大核心
1997年第3期272-277,共6页
Mineral Deposits
基金
国家黄金局"山东文登市金矿成矿规律及矿体定位预测研究"项目
关键词
韧性剪切带
成矿作用
动力学
构造动力
金矿床
ductile shearing, metallogenesis, structural driving force, Wendeng gold deposit, Shandong
