摘要
沂沭断裂带是一条岩石圈断裂 ,有着悠久的演化历史 ,在中生代受库拉板块和太平洋板块运动作用 ,发展成为裂谷式断裂系统。通过对沂沭断裂带中段地质特征的研究 ,初步总结了沂水—汤头断裂是在晋宁期形成的北东向中浅层次韧性剪切带的基础上 ,经后期脆性构造叠加、改造而形成的一条复杂的韧—脆性构造带 ,它对区内金矿的形成起控制作用 ,并具有控、容矿构造之特征。在该带内已发现六个金矿体 ,赋矿围岩为蚀变的绿片岩。
Yi-Shu fault is a lithosphere fracture belt with a long history, which formed a rift fracture system by the effect of the Kula plate and the Pacific plate movement during Mesozoic. According to the study on the middle part of this fault, it is suggested that this part (from Yi-Shu to Tangtou) is a middle-deep ductile shear zone with NE direction, and firstly formed during Jinning period (Newproterozoic). And later it was overprinted and reformed by the brittle structure and formed a complex ductile-brittle structural belt at last. It controls the gold ore formation, and is the host structure of the gold ore. 4 ore bodies have been found in the belt. Their host rocks are alteration green schist, mylonitization cataclastic rock and granitic cataclastic rock.
出处
《地质调查与研究》
2004年第4期255-260,共6页
Geological Survey and Research
基金
中国地质调查局大调查项目 (2 0 0 110 2 0 0 0 5 1)
