海南戈枕断裂带构造演化与金矿化的关系

TECTONIC EVOLUTION AND GOLD MINERALIZATION OF THE GE-ZHEN FAULT ZONE OF HAINAN

本文简要介绍了海南戈枕断裂带及其控制的4种金矿化的地质特征,重点探讨断裂带的构造演化与金矿化的关系。在历经早期的混合岩化及固态流变构造群落之后,该断裂带具明显的伸展拆离→逆冲推覆→走滑平移演化特征。断裂变形由韧性向脆性演化、断裂活动带由南东向北西迁移的趋势,相应产出各类金矿化。

The tectonic evolution of the Ge-Zhen fault zone and its control upon four types of associated gold mineralization are investigated. During the Caledonian to Early Variscan Period, the fault zone initiated with the accompaniment of magmatization enriched in Au. During the Indosinian Period, the fault zone was under extension allowing the formation of mylonitic gold deposits. During late Indosinian to early Yanshanian period, the fault zone formed the Jiaojia type gold deposit in the upper plate fracture of the fault zone. During the Late Yanshanian to Himalayan period, the fault zone underwent transtension with northeast-trending sinistral shear and block faulting which accompanied the deposition of quartz-vein type gold deposits. Deformation evolved from strongly ductild to brittle deformation with the active zone of the fault migrating from the southeast to northwest.