秦岭大陆碰撞金成矿机制与金矿带时空定位  

Continent Collision Mechanism of Gold Mineralization and Temporal and Spatial Orientation of Gold Mineralized Zone,Qinling

作　　者：关连绪[1] 王科强[1] 黄辉[1] 王美娟[1] 关妍 

机构地区：[1]武警黄金地质研究所,河北廊坊065000 [2]民政部国家减灾中心,北京100053

出　　处：《地质论评》2006年第4期467-476,共10页Geological Review

摘　　要：通过分析秦岭巨型金矿带内353处岩金矿床的时空分布特征发现,带内矿化强弱变化有序,由NE向SW依次分出小秦岭—熊耳山强矿化带、北秦岭弱矿化带、中秦岭强矿化带、南秦岭弱矿化带和松潘—甘孜强矿化带5个亚带。它们的成矿时代始于印支期,经燕山期,终于喜马拉雅早期。其中小秦岭—熊耳山亚带主成矿期为燕山晚期,中秦岭亚带主成矿期为燕山早期,松潘—甘孜亚带主成矿期为燕山晚期至喜马拉雅早期。金矿带时空定位在于控矿构造带的时空定位。空间上,控矿构造带包容金矿带或基本一致;时间上,金矿带与控矿构造带基本同步或滞后。金矿带时空变化原因在于控矿构造带的构造迁移,从控矿构造带的主断面向两侧迁移,迁移速率0.78～3.5km/Ma。金矿带及其控矿构造带的形成和迁移原因在于大陆碰撞。大陆碰撞及其俯冲带下插构造位的加深,依次形成变质岩及变质成矿热液—改造系列花岗岩及气液成矿流体—同熔系列花岗岩及超临界成矿流体。不同构造位的成矿流体特征不同,形成不同矿床成因类型。成矿流体上升形式和构造空间不同,形成不同的矿化类型。The temporal and spatial distribution of the 353 gold deposits in the Qinling gold mineralized zone found that the mineralization intensity regulation, it can be divided into 5 sub-zones： the Little Qinling（Xiaoqinling）- Xiong＇ershan strong mineralized zone, the North Qinling weak mineralized zone, the Middle Qinling strong mineralized zone, the South Qinling weak mineralized zone, and the Songpan-Garze strong mineralized zone. The mineralization ages begins Indosinian, through Yanshanian epoch and end in Himalayan epoch. The mineralization age of Little Qinling-Xiong＇ershan sub-zone was Later Yanshanian epoch, Middle Qinling subzone was Early Yanshanina epoch and Songpan-Garze sub-zone was Later Yanshanian epoch to Early Himalayan epoch. The synthetical research shows that the main cause for the temporal and spatial orientation of gold mineralized zone is that the temporal and spatial orientation of the ore control tectonic zone. On spatial, the ore control tectonic zone contains the gold mineralized zone or is the gold mineralized zone itself. On temporal, the gold mineralized zone is synchronous or hysteretic with the ore control tectonic zone. The cause of the change of the temporal and special of gold mineralized zone is the tectonic transfer of the ore control tectonic zone that from the major fault face to the two sides and the move velocity is 0. 78 - 3.5 km/ Ma. The formation and the movement of the gold mineralized zone and the ore control tectonic zone is the result of the continent collision. Continent collision and the deepen of the dive position of its dive zone cause the form of metamorphosed rock, metamorphosed mineralized fluid rebuild granite, gaseous and liquid mineralization fluid comelting granite and super-critical mineralized fluid. It is the different mineralized fluid features of different structure position caused different formation types of gold deposit, and is the different fluid move up shape and structure space caused different mineralization type.

关 键 词：金矿带 时空定位 大陆碰撞 金成矿 秦岭 

分 类 号：P618.51[天文地球—矿床学]