祁吕贺兰山字型构造控金研讨

Discuss on gold control by Qi-Lu-He epsilon-type structure

祁吕贺兰山字型构造在古生代末期开始活动 ,中生代成形 ,新生代定形。与金成矿关系极为密切 ,金矿分为岩金和砂金矿。岩金包括含金石英脉型、构造蚀变岩型、岩浆岩型、浸染型、硅铁型及氧化铁帽型。祁吕贺兰山字型构造的各组成部分均发现有金矿床 ,以弧顶遥居首位 ,依次为前弧、砥柱、反射弧、反射弧脊柱 ,马蹄形盾地及脊柱。该构造区内分布着小秦岭、陕甘川金三角 ,还有燕山和晋东北金矿区 ,熊耳山金矿密集区等。大多数岩金矿形成于燕山期 ,砂金形成于第四纪。

Qi Lu He epsilon type structure was active in Late Palaeozoic Era, formed in Mesozoic Era and fixed in Cenozoic Era. It is closely related with gold mineralization and the gold deposits are divided into rock gold and placer gold. Rock gold includes gold bearing quartz vein, structural altered, magmatic, disseminated, fersilic and oxidized gossan types. Gold deposits are located in each component of Qi Lu He epsilon type structure. Gold deposits are most in the top of arc, then successively in the frontal arc, firm rock, reflex arc, backbone of reflex arc, horseshoe shaped betwixt land and backbone. Xiaoqinling, Shaan Gan Chuan gold triangle, Yanshan and northeast of Shanxi gold mining areas, and Xiong'ershan gold concentration area are distributed in this structural belt. Most of gold deposits formed in Yanshan Period and placer gold deposits formed in Quaternary Period.